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学者姓名：李鹏飞
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摘要 ：
This paper aims at investigating the instability mechanism that occurs during the under-crossing of an existing pipeline using model tests and numerical simulations. The strain in the pipeline, earth pressure, surface settlement, and mechanisms of stratum instability during the process of instability have been obtained. The research findings reveal three distinct growth stages in the longitudinal deformation of the existing pipeline, with the strain growth rate during the rapid growth phase being 2-3 times higher than that observed during the slow growth phase. The pipeline displays a deformation pattern with tensile stress in the upper section and compressive stress in the lower section, due to the uneven force distribution along its length. In the absence of pipelines, the distribution of surface collapse exhibits a distinct "V" shaped. As the clear distance between the existing pipeline and the tunnel (CDPT) increases, there is a transition from a "partial W" to a "positive W" type distribution. The presence of the pipeline exerts the most significant inhibiting effect on the soil directly above it. In cases where there is no pipeline or the CDPT is small, soil leakage primarily occurs in front of the excavation. As the CDPT increases, soil leakage occurs around the pipeline and the instability range of the stratum significantly expands. The stable strata above the pipeline gradually widen, and the area with a significant influence range shifts from the right side to the left side of the existing pipeline.
关键词 ：
Shield under-crossing existing pipeline Shield under-crossing existing pipeline Earth pressure Earth pressure Instability mechanism Instability mechanism Surface settlement Surface settlement Model test Model test
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| GB/T 7714 | Cui, Xiaopu , Li, Pengfei , Ma, Zeshuai et al. Model test study on instability mechanism during shield under-crossing existing pipeline [J]. | ENGINEERING FAILURE ANALYSIS , 2025 , 167 . |
| MLA | Cui, Xiaopu et al. "Model test study on instability mechanism during shield under-crossing existing pipeline" . | ENGINEERING FAILURE ANALYSIS 167 (2025) . |
| APA | Cui, Xiaopu , Li, Pengfei , Ma, Zeshuai , Xu, Qing , Jia, Fei , Ge, Zhaoguo et al. Model test study on instability mechanism during shield under-crossing existing pipeline . | ENGINEERING FAILURE ANALYSIS , 2025 , 167 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Shield method has developed rapidly in the construction of underground or subsea tunnels. The stability of the tunnel excavation face is essential for the safe construction of tunnels, particularly in water-rich and inclined strata. The present study conducted shield model tests in water-rich inclined strata to analyze the surface settlement, ground earth pressure, areas of instability, and failure mechanism during the process of instability. The results indicate a decrease in settlement of the longitudinal monitoring points as the backward distance from the tunnel boundary line increases. Additionally, the settlement analysis of transverse monitoring sections reveals that the most significant settlement occurs directly above the tunnel. When equidistant from the tunnel excavation face, the surface settlement exhibits a significantly greater magnitude in front of it compared to behind it. The extent of influence is maximized when the inclination angle is negative, regardless of whether it pertains to the collapse in width or height on the surface. The application of DIC image analysis reveals that distinct failure mechanisms are observed for varying stratum inclination angles. The shear strain concentration becomes more pronounced with an increase in the backward distance, resulting in predominant distribution of shear bands in front of and above the tunnel. Compared to water-rich horizontal stratification or homogeneous soil layers, there are distinct variations in surface collapse magnitude, stratum disturbance range, and the instability mechanism of stratum instability in water-rich inclined strata. Therefore, when confronted with engineering projects involving inclined strata, it is imperative to consider the influence of geological factors.
关键词 ：
Surface collapse Surface collapse Failure mechanism Failure mechanism Seepage flow Seepage flow Model test Model test Water-rich inclined strata Water-rich inclined strata
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| GB/T 7714 | Cui, Xiaopu , Li, Pengfei , Ge, Zhaoguo et al. Experimental study on face stability of shield tunnel in water-rich inclined composite strata considering different inclination angles [J]. | APPLIED OCEAN RESEARCH , 2025 , 154 . |
| MLA | Cui, Xiaopu et al. "Experimental study on face stability of shield tunnel in water-rich inclined composite strata considering different inclination angles" . | APPLIED OCEAN RESEARCH 154 (2025) . |
| APA | Cui, Xiaopu , Li, Pengfei , Ge, Zhaoguo , Li, Shaohua , Chen, Yang . Experimental study on face stability of shield tunnel in water-rich inclined composite strata considering different inclination angles . | APPLIED OCEAN RESEARCH , 2025 , 154 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The present study develops a novel type of active joint node-bolt fasten wedge (BFW) active joints, aiming to investigate the loadbearing capacity of a BFW joint in a quantitative way and put forward precise formulas for its yield load and compression rigidity. To achieve this, indoor axial loading tests were conducted on two BFW joints, accompanied by a set of numerical simulations with the finite element approach implemented in ABAQUS. Parametric research was then conducted to assess the impact of various factors on the yield load and initial compression rigidity of BFW joints, leading to the derivation of precise calculation formulas for accurate prediction of these parameters. The key findings indicate that enhancing the bolt strength from 10.9 to 12.9 significantly improves mechanical performance. Under axial compression, the final bearing force, yield load, and initial compression rigidity increase by 0.86, 1.06, and 0.15 times, respectively. Numerical models accurately predict joint behavior under axial force, confirming their reliability. Parameter studies reveal that increasing web and eaves thickness, bolt strength, and diameter improves bearing capacity, while splint thickness has little effect. The fitting formulas introduced can precisely estimate yield load and rigidity, providing practical value for engineering applications.
关键词 ：
Finite element analysis (FEA) Finite element analysis (FEA) BFW BFW Yield load Yield load Load-bearing capacity Load-bearing capacity Compression rigidity Compression rigidity Parametric analysis Parametric analysis
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| GB/T 7714 | Ge, Chenhe , Li, Pengfei , Zhang, Mingju et al. Experimental and numerical investigation of the load-bearing capacity of bolt-fastened wedge active joints for prestressed internal bracing in subway excavations [J]. | UNDERGROUND SPACE , 2025 , 21 : 100-116 . |
| MLA | Ge, Chenhe et al. "Experimental and numerical investigation of the load-bearing capacity of bolt-fastened wedge active joints for prestressed internal bracing in subway excavations" . | UNDERGROUND SPACE 21 (2025) : 100-116 . |
| APA | Ge, Chenhe , Li, Pengfei , Zhang, Mingju , Yang, Meng , Wan, Weizi . Experimental and numerical investigation of the load-bearing capacity of bolt-fastened wedge active joints for prestressed internal bracing in subway excavations . | UNDERGROUND SPACE , 2025 , 21 , 100-116 . |
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摘要 ：
This paper focuses on the optimization of uplift piles for a base plate considering local anti-floating stability. According to the force characteristics of the base plate subjected to buoyancy, a bi-directional evolutionary structural optimization (BESO) process is proposed. The optimization process takes the pile length as the design variable and the pile end displacement as the sensitive coefficient. The proposed process is conducted with FLAC3D to optimize the length of each uplift pile, including two cases with different pile diameters and spacing. The optimization process shows that the deformation degree of the base plate is significantly reduced when the piles are adopted with large diameters and sparse spacing, and oscillates at a low level when the piles are adopted with small diameters and dense spacing. Consequently, the design method of uplift piles considering the local anti-floating stability is proposed by referring to the optimization results of two cases. Finally, the proposed design method is applied to a practical project, and the original design of the uplift piles is optimized. The comparison results show that the deformation degree of the base plate of optimization designs is significantly lower than the original design.
关键词 ：
local anti-floating stability local anti-floating stability numerical simulation numerical simulation BESO BESO uplift piles uplift piles
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| GB/T 7714 | Yang, Meng , Wu, Jie , Lu, Qianqian et al. Optimization of Uplift Piles for a Base Plate Considering Local Anti-Floating Stability [J]. | APPLIED SCIENCES-BASEL , 2024 , 14 (12) . |
| MLA | Yang, Meng et al. "Optimization of Uplift Piles for a Base Plate Considering Local Anti-Floating Stability" . | APPLIED SCIENCES-BASEL 14 . 12 (2024) . |
| APA | Yang, Meng , Wu, Jie , Lu, Qianqian , Li, Pengfei . Optimization of Uplift Piles for a Base Plate Considering Local Anti-Floating Stability . | APPLIED SCIENCES-BASEL , 2024 , 14 (12) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Maintaining the stability of the tunnel face during the construction of the submarine shield tunnel is the prerequisite for safe construction. A series of face instability model tests under saturated strata were carried out. The earth pressure, the evolution of the soil arch area and the amount of soil entering the soil groove caused by the instability of the tunnel face under different face water pressure conditions were studied. A series of numerical simulations were carried out to analyze the effects of tunnel face water pressure. The results show that the vertical earth pressure and horizontal earth pressure at different positions show a gradual decrease with the increase of the baffle backward distance, and the smaller the water pressure ratio, the more obvious this law is. According to the test results, the decrease of the water pressure ratio of the tunnel face can significantly increase the soil intake of the soil tank, which indicates that the collapse range above the tunnel face is large. The trend of instability region obtained by numerical simulation is consistent with the test monitoring results. This provides a reference for the construction of submarine shield tunnels.
关键词 ：
Seepage flow Seepage flow Shield tunnels Shield tunnels Numerical simulations Numerical simulations Model tests Model tests Tunnel face stability Tunnel face stability
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| GB/T 7714 | Di, Qiguang , Li, Pengfei , Zhang, Mingju et al. Experimental study on the effect of seepage flow on the tunnel face stability in the saturated ground [J]. | OCEAN ENGINEERING , 2024 , 299 . |
| MLA | Di, Qiguang et al. "Experimental study on the effect of seepage flow on the tunnel face stability in the saturated ground" . | OCEAN ENGINEERING 299 (2024) . |
| APA | Di, Qiguang , Li, Pengfei , Zhang, Mingju , Jia, Youxiu , Li, Shaohua , Cui, Xiaopu . Experimental study on the effect of seepage flow on the tunnel face stability in the saturated ground . | OCEAN ENGINEERING , 2024 , 299 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Local failures (loss of concrete or reinforcement) can severely compromise the bearing capacity of shield segments, damaging the tunnel structures. To investigate the effects of local openings on the bearing behavior and failure mechanism, four full-scale bending tests were conducted on specimens with different opening positions and diameters; monitoring of load, displacement, and concrete strain was performed during loading. The test results reveal that both the opening position and diameter significantly influence the bearing characteristics of the segment. The failure process includes four sequential stages distinguished by three critical loads, namely the cracking, failure, and ultimate loads. Subsequently, the numerical model of the local failure segment was established using the elastoplastic damage constitutive relation of the concrete and verified by inversing the full-scale test results. Based on the numerical model, parametric analyses were performed to comprehensively investigate the influences of the opening position, concrete loss, and reinforcement loss on the bending capacity. Furthermore, an analytical model was proposed, indicating that the opening position is the primary factor decreasing the bearing capacity, followed by the opening diameter and reinforcement loss. The results of this study can provide a theoretical basis for the safety assessment and remedial design of subway shield tunnels under extreme breakthrough conditions.
关键词 ：
Bearing behavior Bearing behavior Failure mechanism Failure mechanism Local opening segment Local opening segment Shield tunnel Shield tunnel
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| GB/T 7714 | Gao, Xiaojing , Li, Pengfei , Zhang, Mingju et al. Effect of local openings on bearing behavior and failure mechanism of shield tunnel segments [J]. | UNDERGROUND SPACE , 2024 , 16 : 183-205 . |
| MLA | Gao, Xiaojing et al. "Effect of local openings on bearing behavior and failure mechanism of shield tunnel segments" . | UNDERGROUND SPACE 16 (2024) : 183-205 . |
| APA | Gao, Xiaojing , Li, Pengfei , Zhang, Mingju , Wang, Haifeng , Jia, Ziqi , Feng, Wu . Effect of local openings on bearing behavior and failure mechanism of shield tunnel segments . | UNDERGROUND SPACE , 2024 , 16 , 183-205 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This study focuses on the analytical prediction of subsurface settlement induced by shield tunnelling in sandy cobble stratum considering the volumetric deformation modes of the soil above the tunnel crown. A series of numerical analyses is performed to examine the effects of cover depth ratio (C/D), tunnel volume loss rate (ht) and volumetric block proportion (VBP) on the characteristics of subsurface settlement trough and soil volume loss. Considering the ground loss variation with depth, three modes are deduced from the volumetric deformation responses of the soil above the tunnel crown. Then, analytical solutions to predict subsurface settlement for each mode are presented using stochastic medium theory. The influences of C/D, ht and VBP on the key parameters (i.e. B and N) in the analytical expressions are discussed to determine the fitting formulae of B and N. Finally, the proposed analytical solutions are validated by the comparisons with the results of model test and numerical simulation. Results show that the fitting formulae provide a convenient and reliable way to evaluate the key parameters. Besides, the analytical solutions are reasonable and available in predicting the subsurface settlement induced by shield tunnelling in sandy cobble stratum. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
关键词 ：
Volumetric deformation mode Volumetric deformation mode Stochastic medium theory Stochastic medium theory Shield tunnelling Shield tunnelling Sandy cobble stratum Sandy cobble stratum Subsurface settlement Subsurface settlement
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| GB/T 7714 | Wang, Fan , Du, Xiuli , Li, Pengfei . Prediction of subsurface settlement induced by shield tunnelling in sandy cobble stratum [J]. | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING , 2024 , 16 (1) : 192-212 . |
| MLA | Wang, Fan et al. "Prediction of subsurface settlement induced by shield tunnelling in sandy cobble stratum" . | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 16 . 1 (2024) : 192-212 . |
| APA | Wang, Fan , Du, Xiuli , Li, Pengfei . Prediction of subsurface settlement induced by shield tunnelling in sandy cobble stratum . | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING , 2024 , 16 (1) , 192-212 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper aims at proposing a calculation model to deal with the face stability of shield tunnels in unsaturated soil. Based on the existing results of centrifugal test and numerical simulation, a new failure mechanism is proposed, which combines the logarithmic spiral with upper loosening arch mechanisms. The failure mechanism considers the influence of the soil arching effect and the logarithmic spiral height coefficient. Formulas for calculating the loosening earth pressure of unsaturated soil are deduced. Subsequently, this model of loosening earth pressure is introduced into an analytical model to compute the limit support pressure on the tunnel face. Compared with other height coefficients and the degree of soil arching effect, when the height coefficient is 0.95 and the degree of soil arching effect is 10%-30%, the limit support pressure proposed in this paper is in good agreement with the centrifugal test results. Finally, comparisons are performed with the proposed model and classical models as well as typical centrifuge model tests. The comparative analysis shows that the proposed theoretical model is in good agreement with the numerical simulation. The outline of the failure zone by the theoretical model in this paper is in good agreement with the centrifuge results.
关键词 ：
Limit support pressure Limit support pressure Face stability Face stability Logarithmic spiral Logarithmic spiral Soil arch effect Soil arch effect Unsaturated soil Unsaturated soil
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| GB/T 7714 | Cui, Xiaopu , Li, Pengfei , Wu, Jie et al. Stability Analysis of a Shield Tunnel in Unsaturated Soil Considering the Soil Arch Effect [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (4) . |
| MLA | Cui, Xiaopu et al. "Stability Analysis of a Shield Tunnel in Unsaturated Soil Considering the Soil Arch Effect" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 24 . 4 (2024) . |
| APA | Cui, Xiaopu , Li, Pengfei , Wu, Jie , Wei, Yingjie . Stability Analysis of a Shield Tunnel in Unsaturated Soil Considering the Soil Arch Effect . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (4) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this paper, the bearing capacities and failure behaviors of bolt-fastened wedge active joints used in prestressed internal supports are studied. A thorough exploration of the design of the bolt-fastened wedge active joint is elaborated, and an overview, working mechanism, stiffness analysis, parameters, and strength checking are provided. Then, loading tests are conducted on four full-scale specimens. One test is an axial compression test, while the other three tests are performed to analyze the long-axis (Y-axis) eccentricity, short-axis (X-axis) eccentricity, and biaxial (XY-axis) eccentricity. The load-displacement curve, load-strain curve, bending momentrotation curve, and failure mode of each specimen are obtained. The experimental results show that the samples have good compressive properties and bending resistance. The impact of the X-axis and Y-axis eccentricities on the compressive ultimate bearing capacity is investigated, revealing a significant reduction in the former, while the latter has a minimal effect. Under bidirectional eccentricity, the weakening of the axial bending performance is most apparent. Bidirectional eccentric loads lead to a reduction in the yield load and initial compression stiffness to approximately 90% of those observed under unidirectional eccentricity. Finally, a field test is carried out to compare the constructability and load-holding performances of bolt-fastened wedge active joints with those of commonly used steel wedge active joints. It is demonstrated that the bolt-fastened wedge active joint effectively maintains prestress through bolt fastening, substantially enhancing the safety of foundation pit excavation construction.
关键词 ：
Subway foundation pit Subway foundation pit Active joint Active joint Field test Field test Bearing capacity Bearing capacity Bolt fasten wedge Bolt fasten wedge
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| GB/T 7714 | Zhang, Mingju , Ge, Chenhe , Li, Pengfei et al. Bearing capacities and failure behaviors of bolt fasten wedge (BFW) active joints used in prestressed internal supports [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 143 . |
| MLA | Zhang, Mingju et al. "Bearing capacities and failure behaviors of bolt fasten wedge (BFW) active joints used in prestressed internal supports" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 143 (2024) . |
| APA | Zhang, Mingju , Ge, Chenhe , Li, Pengfei , Wan, Weizi , Yang, Meng . Bearing capacities and failure behaviors of bolt fasten wedge (BFW) active joints used in prestressed internal supports . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 143 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper focuses on the mechanical properties of bolt-fastened wedge (BFW) joints utilized in prestressed internal support under eccentric loading. The validated finite element model was established based on the fullscale test results of BFW joints subjected to eccentric loads. A series of numerical simulations were conducted to systematically investigate the bearing capacity and bending performance of the BFW joint under eccentric loads. The influence of eccentricity, web thickness, eaves thickness, base splint thickness, bolt strength, and bolt diameter on the load-bearing and bending performance of BFW joints was investigated through further parametric evaluations. A four-parameter exponential moment-rotation model was developed based on the numerical results, demonstrating its accurate representation of failure modes, load-displacement curves, and momentrotation curves observed in full-scale tests. The load-bearing and bending performance of the BFW joint exhibited a predominantly positive correlation with parameters such as web thickness, eave thickness, bolt strength, and bolt diameter; however, the effects of these parameters were inconsistent. The influence of bolt strength and diameter was found to be the most significant, while the effect of splint thickness was minimal, indicating a considerable level of redundancy. As eccentricity increased, there was a decline in both load-bearing and bending performance of the BFW joint. Finally, a comparison between the results obtained from fitted formulas and numerical as well as experimental data revealed that the moment-rotation model accurately described the bending performance of the BFW joint under eccentric loads.
关键词 ：
Moment-rotation model Moment-rotation model Eccentric load Eccentric load BFW BFW Failure modes Failure modes Bearing capacity Bearing capacity
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| GB/T 7714 | Ge, Chenhe , Li, Pengfei , Zhang, Mingju et al. Numerical analysis of bolt-fastened wedge-BFW-joints under eccentric loading [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 222 . |
| MLA | Ge, Chenhe et al. "Numerical analysis of bolt-fastened wedge-BFW-joints under eccentric loading" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 222 (2024) . |
| APA | Ge, Chenhe , Li, Pengfei , Zhang, Mingju , Yang, Meng , Wan, Weizi . Numerical analysis of bolt-fastened wedge-BFW-joints under eccentric loading . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2024 , 222 . |
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