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学者姓名：杜修力
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摘要 ：
In this study, we perform a stability analysis on three-dimensional (3D) geosynthetic-reinforced soil structures (GRSSs), focusing on their response to varying rainfall conditions. The magnitude and distribution of pore water pressure in unsaturated backfills throughout the infiltration event is calculated to determine the time-dependent matric suction and apparent cohesion in backfills. An analytical expression representing the necessary strength for geosynthetic reinforcement in 3D GRSS is derived from the energy balance equation, utilizing the kinematic limit analysis approach. The validities of both the necessary reinforcement strength and the pore water pressure distribution are confirmed in this study. Further exploration is conducted into the effects of the 3D geometric features of the GRSSs, the effective cohesion and friction angle of backfills, alongside factors related to rainfall intensity, duration and patterns. These considerations influence both the required reinforcement strength and the failure pattern of the GRSSs. The findings indicate that the necessary reinforcement strength and critical failure pattern of a GRSS are dictated not only by its 3D geometric properties but also by the unsaturated soil mechanics and the nature of the rainfall it encounters. An identical accumulated rainfall will result in approximately a same required reinforcement strength solution of GRSS after rainfall. This study provides guidance on preliminary design of GRSSs under rainfall conditions.
关键词 ：
Geosynthetics reinforcement Geosynthetics reinforcement Required reinforcement strength Required reinforcement strength Rainfall infiltration Rainfall infiltration Unsaturated backfills Unsaturated backfills
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| GB/T 7714 | Xu, Jingshu , Xie, Pengfei , Qi, Linghao et al. Required reinforcement strength of 3D geosynthetic-reinforced soil structures subjected to rainfall infiltration [J]. | COMPUTERS AND GEOTECHNICS , 2024 , 174 . |
| MLA | Xu, Jingshu et al. "Required reinforcement strength of 3D geosynthetic-reinforced soil structures subjected to rainfall infiltration" . | COMPUTERS AND GEOTECHNICS 174 (2024) . |
| APA | Xu, Jingshu , Xie, Pengfei , Qi, Linghao , Du, Xiuli . Required reinforcement strength of 3D geosynthetic-reinforced soil structures subjected to rainfall infiltration . | COMPUTERS AND GEOTECHNICS , 2024 , 174 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Roof stability is a main concern in tunneling engineering. A modified Mohr-Coulomb (MC) strength criterion to reduce the overestimation of the tensile strength described from the MC strength criterion is employed in this work. An analytical stability analysis of three-dimensional (3D) tunnel roofs for both circular and rectangular tunnels in soil is performed based on collapse mechanisms composed of a series of right elliptical cones by limit analysis. Two kinds of tunnel roof stability measures, that is the stability number, and the minimum supporting pressure required to ensure the tunnel roof stability are derived. Optimization codes are programmed to search for the most critical stability measure solutions. Comparative analyses are conducted to verify this work, and the influences of the soil strength characteristics, tensile strength cutoff, and the 3D characteristics on both the stability and the failure pattern of tunnel roof are revealed. It is shown that a stability analysis of tunnel roof considering tensile strength cutoff derives more critical stability estimations, especially for a tunnel roof under a lower internal friction angle but a greater cohesion. The 3D geometrical characteristics of tunnel roof has significant influences on both the stability measures and the function of soil strength cutoff on the stability measures. Compared with circular tunnels, supporting pressures will always being needed for rectangular tunnels to maintain the stability of tunnel roof, especially under a full tensile strength cutoff condition.
关键词 ：
Tensile strength cutoff Tensile strength cutoff Tunnel roof stability Tunnel roof stability Three-dimensional Three-dimensional Required supporting pressure Required supporting pressure Stability number Stability number
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| GB/T 7714 | Xu, Jingshu , Liu, Weicheng , Wang, Xinrui et al. Stability analysis of three-dimensional tunnel roofs in soil based on a modified MC criterion [J]. | ACTA GEOTECHNICA , 2024 , 19 (9) : 5989-6004 . |
| MLA | Xu, Jingshu et al. "Stability analysis of three-dimensional tunnel roofs in soil based on a modified MC criterion" . | ACTA GEOTECHNICA 19 . 9 (2024) : 5989-6004 . |
| APA | Xu, Jingshu , Liu, Weicheng , Wang, Xinrui , Du, Xiuli . Stability analysis of three-dimensional tunnel roofs in soil based on a modified MC criterion . | ACTA GEOTECHNICA , 2024 , 19 (9) , 5989-6004 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Seismic fragility analysis can quantitatively evaluate the seismic performance of structures from a probabilistic viewpoint and accurately characterize the relationship between the degree of structural damage and ground motion intensity. This study investigates the seismic fragility of shield tunnels in three different liquefiable and non-liquefiable soils. A plane-strain finite element model of the saturated soil and shield tunnel is established via the OpenSees computational platform employing the multi-yield surface elastoplastic PressureDependMultiYield and PressureIndependMultiYield models to simulate the constitutive behaviour of liquefiable and non-liquefiable soils. The developed model is utilized to conduct nonlinear dynamic effective stress time history analyses to generate the seismic fragility curves and surfaces based on the incremental dynamic analysis method. Meanwhile, appropriate scalar- and vector-valued intensity measures are identified based on their correlation, efficiency, practicality and proficiency. Compared with the fragility curves based on scalar-valued intensity measures, the fragility surfaces based on the vector-valued intensity measures can better describe the effect of ground motion characteristics on the structural seismic demand, and thus can more accurately assess the structural seismic performance. The seismic damage probabilities derived from the fragility curves and surfaces reveal that the seismic damage risk of the shield tunnel in sandwiched liquefiable soil deposit is higher than that of the tunnel structure located in entirely liquefiable or non-liquefiable soil profiles. This finding underscores the importance of carefully evaluating the seismic safety of shield tunnels situated in sandwiched liquefiable soil deposits.
关键词 ：
Seismic fragility curves and surfaces Seismic fragility curves and surfaces Soil-structure interaction Soil-structure interaction Intensity measure Intensity measure Shield tunnel Shield tunnel Effective stress analysis Effective stress analysis
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| GB/T 7714 | Shen, Yiyao , El Naggar, M. Hesham , Zhang, Dong-Mei et al. Scalar- and vector-valued seismic fragility assessment of segmental shield tunnel lining in liquefiable soil deposits [J]. | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 155 . |
| MLA | Shen, Yiyao et al. "Scalar- and vector-valued seismic fragility assessment of segmental shield tunnel lining in liquefiable soil deposits" . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 155 (2024) . |
| APA | Shen, Yiyao , El Naggar, M. Hesham , Zhang, Dong-Mei , Huang, Zhong-Kai , Du, Xiuli . Scalar- and vector-valued seismic fragility assessment of segmental shield tunnel lining in liquefiable soil deposits . | TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY , 2024 , 155 . |
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摘要 ：
The effect of saline on the shear strength of compacted bentonite is important to investigate the safety assessment of engineering barriers of deep geological repositories. Different methods used for saturating compacted specimens yield inconsistent relationships between shear strength and salt solution concentration. In this study, we performed direct shear tests on compacted Na-bentonite saturated with distilled water and Na solutions using the constant-vertical stress (CP) method and the constant-volume (CV) method. Scanning electron microscopy (SEM) and nuclear magnetic resonance (NMR) measurements were conducted to investigate the microstructural characteristics of compacted bentonite. The results show that the measured shear strength increases with increasing vertical stress or solution concentration. Furthermore, the shear strength of specimens prepared through the CV method is larger when distilled water is used for saturation; at the same time, when salt solutions are used for saturation, CP samples show greater shear strength. On the microscale, both SEM images and NMR results show that specimens become increasingly aggregated with increasing pore-water salinity and that saline solution has a greater effect on the microstructure of the compacted bentonite when using the CP method for saturation because of the change in volume during saturation. The intergranular stress equation, which considers physicochemical effects, is introduced to theoretically characterize the mechanical behavior of compacted bentonite. It is found that the relationship between intergranular stress and shear strength is unique, independent of the saturation method. In other words, the salt solution concentration affects the microstructure, thereby affecting the interparticle stress of compacted bentonite.
关键词 ：
Intergranular stress Intergranular stress Saline effect Saline effect Compacted bentonite Compacted bentonite Shear strength Shear strength Microfabric Microfabric
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| GB/T 7714 | Song, Zhaoyang , Zhang, Zhihong , Du, Xiuli . Shear Strength of Compacted Bentonite Saturated with Saline Solutions under Different Specimen Saturation Methods [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (3) . |
| MLA | Song, Zhaoyang et al. "Shear Strength of Compacted Bentonite Saturated with Saline Solutions under Different Specimen Saturation Methods" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 24 . 3 (2024) . |
| APA | Song, Zhaoyang , Zhang, Zhihong , Du, Xiuli . Shear Strength of Compacted Bentonite Saturated with Saline Solutions under Different Specimen Saturation Methods . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (3) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Commercial buildings have become one of the main sources of carbon emissions. However, the current research on urban form optimization has lacked analyses of the low-carbon indicators of buildings. With the Beijing commercial district as an example, a low-carbon-oriented urban form optimization path is established in this study, and a new method of urban form optimization is developed from a low-carbon perspective. With the help of the parametric platform and multiobjective optimization algorithm, a dynamic optimization model of urban morphology based on parametric modeling, numerical simulation and algorithm optimization is developed, and the morphological characteristics of low-carbon commercial blocks in Beijing are assessed with a Pareto-optimal solution set. Through principal component regression analysis, the correlations between urban form factors and low-carbon evaluation indicators are discussed. The study shows that the multiobjective optimization algorithm effectively optimizes the low-carbon indicators of buildings at the block scale. The urban forms obtained from the Pareto solution set display several commonalities reflected from three perspectives: building type, vertical dimension and building orientation. It is found that the optimal block layout form reduces the building carbon emission intensity and the building outer skin radiation difference, and the renewable energy-based carbon reduction is large. The urban form factors that have a significant impact on the carbon emission intensity of buildings include the maintenance coefficients, the average area to perimeter ratio, and the sky view factor, with respective impact coefficients of 0.301, -0.309, and -0.319.
关键词 ：
Urban form factors Urban form factors Carbon emission intensity Carbon emission intensity Multiobjective dynamic optimization model Multiobjective dynamic optimization model Commercial district Commercial district Low-carbon evaluation indicators Low-carbon evaluation indicators
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| GB/T 7714 | Wang, Jingjing , Liu, Wenxiang , Du, Xiuli et al. Low-carbon-oriented commercial district urban form optimization and impact assessment analysis [J]. | BUILDING AND ENVIRONMENT , 2024 , 254 . |
| MLA | Wang, Jingjing et al. "Low-carbon-oriented commercial district urban form optimization and impact assessment analysis" . | BUILDING AND ENVIRONMENT 254 (2024) . |
| APA | Wang, Jingjing , Liu, Wenxiang , Du, Xiuli , Zhang, Weirong . Low-carbon-oriented commercial district urban form optimization and impact assessment analysis . | BUILDING AND ENVIRONMENT , 2024 , 254 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Liquefaction poses a potential threat to the safety, serviceability and stability of shield tunnels during seismic events. This study investigates the seismic response of shield tunnels in liquefiable soils employing a fully coupled dynamic effective stress analysis model. The model accounts for the nonlinear mechanical behavior of the shield tunnel structure and incorporates the advanced bounding surface elastoplastic PM4Sand and PM4Silt models integrated with Biot u - p formulation to simulate the constitutive behavior of liquefiable and nonliquefiable soil layers. The seismic performance of shield tunnel -liquefiable soil system is evaluated considering ground motions with different characteristics in the transverse direction. The numerical results reveal the significant effects of ground motion frequency content and seismic intensity on the liquefaction triggering, the tunnel deformation and the internal forces of segmental joints. The soil -structure dynamic interaction and the soil shear dilatancy characteristics greatly influence the generation of the earthquake -induced excess pore water pressure and post -liquefaction shear strains. It is observed that the soil contact pressures on the left and right springlines of the tunnel experience larger increase compared to the contact pressure on the tunnel crown and invert. This observation suggests that the soil could cause racking deformation on both sides of the tunnel structure towards the center. Besides, the deformations and mechanical behaviors of the segmental joints around the tunnel left and right feet and the right springline are notably higher than at other joints in the saturated deposits. Furthermore, it is found that ground motion characterized by low -frequency contents, amplifies the seismic response of the soil and the tunnel when compared to the ground motions with high or moderatefrequency contents.
关键词 ：
Shield tunnel Shield tunnel Fully coupled effective stress analyses Fully coupled effective stress analyses Frequency content Frequency content Liquefaction Liquefaction Sandwiched potential -liquefiable soil layer Sandwiched potential -liquefiable soil layer
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| GB/T 7714 | Shen, Yiyao , El Naggar, M. Hesham , Zhang, Dong-Mei et al. Seismic response characteristics of shield tunnel structures in liquefiable soils [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 182 . |
| MLA | Shen, Yiyao et al. "Seismic response characteristics of shield tunnel structures in liquefiable soils" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 182 (2024) . |
| APA | Shen, Yiyao , El Naggar, M. Hesham , Zhang, Dong-Mei , Li, Liyun , Du, Xiuli . Seismic response characteristics of shield tunnel structures in liquefiable soils . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 182 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The accuracy of slope mechanical parameter values determines the accuracy of slope stability assessments and the effectiveness of protective measures. Traditional methods for obtaining geotechnical parameters cannot entirely take into consideration the size, disturbance, variability, and uncertainty of mechanical parameters. Hence, we aimed to propose two algorithmic models for the geotechnical parameters of highway slope materials based on an improved non-dominated sorting genetic algorithm II (NSGA-II) combined with a GA-optimised backpropagation (BP) neural network (NN),named BPGA- NSGA-II model and improved BPGA- NSGA-II model.The results indicated that compared with the original NSGA-II model, the improved model showed a substantial shift in the Pareto front, and the errors are smaller than the original model.Among the two improved models, the improved BPGA-NSGA-II model has higher inversion accuracy.Therefore, this study provides a scientifically effective method for improving the accuracy of the geotechnical parameter inversion for highway slope materials.
关键词 ：
Inversion Inversion Mechanical parameters Mechanical parameters Geotechnical parameters Geotechnical parameters Improved NSGA-II algorithm Improved NSGA-II algorithm Highway slope Highway slope
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| GB/T 7714 | He, Bo-Hu , Du, Xiu-Li , Bai, Ming-Zhou et al. Inverse analysis of geotechnical parameters using an improved version of non-dominated sorting genetic algorithm II [J]. | COMPUTERS AND GEOTECHNICS , 2024 , 171 . |
| MLA | He, Bo-Hu et al. "Inverse analysis of geotechnical parameters using an improved version of non-dominated sorting genetic algorithm II" . | COMPUTERS AND GEOTECHNICS 171 (2024) . |
| APA | He, Bo-Hu , Du, Xiu-Li , Bai, Ming-Zhou , Yang, Jin-Wen , Ma, Dong . Inverse analysis of geotechnical parameters using an improved version of non-dominated sorting genetic algorithm II . | COMPUTERS AND GEOTECHNICS , 2024 , 171 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Roof stability of shallow-buried cylindrical tunnels in rock strata following the generalized Hoek-Brown criterion (GHB) is analyzed in this work. Based on the limit analysis method, a three-dimensional (3D) shallow-buried collapse mechanism for tunnel roofs is developed to derive various stability measures. Optimization codes are programmed to capture the optimal stability measure solutions. The effects of the 3D geometric characteristics, the rock mass strength parameters, and the buried depth on tunnel roof stability are investigated by a parametric analysis. The critical buried depth ratios corresponding to the transition between the shallow-buried and deep- buried tunnel roof collapse mechanisms are also presented. Thereafter a series of stability charts of the required supporting pressure and the factor of safety (FoS) FoS ) is proposed for design purposes. This study provides a theoretical basis for design and engineering of tunnels with limited buried depth.
关键词 ：
Stability measures Stability measures Shallow-buried tunnel Shallow-buried tunnel Roof stability analysis Roof stability analysis Generalized Hoek-Brown criterion Generalized Hoek-Brown criterion Rock strata Rock strata
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| GB/T 7714 | Xu, Jingshu , Wang, Xinrui , Tian, Yu et al. Roof stability analysis for a shallow-buried cylindrical tunnel in Hoek-Brown rock strata [J]. | COMPUTERS AND GEOTECHNICS , 2024 , 175 . |
| MLA | Xu, Jingshu et al. "Roof stability analysis for a shallow-buried cylindrical tunnel in Hoek-Brown rock strata" . | COMPUTERS AND GEOTECHNICS 175 (2024) . |
| APA | Xu, Jingshu , Wang, Xinrui , Tian, Yu , Du, Xiuli . Roof stability analysis for a shallow-buried cylindrical tunnel in Hoek-Brown rock strata . | COMPUTERS AND GEOTECHNICS , 2024 , 175 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明涉及一种基于隧道—桥梁一体化的多阶段协同抗震体系，属于土木工程抗震技术领域。包括隧道、桥梁以及桥台，所述多阶段协同抗震体系还包括多级连接装置以及减隔震装置，所述桥梁一端通过减隔震装置放置在桥台上，减隔震装置提供耗能及自复位作用；所述隧道、桥梁之间通过所述多级连接装置连接成一个整体，所述多级连接装置能够控制隧道和桥梁产生的相对错动，同时通过变形产生阻尼并实现耗能能力；其中，所述桥台设置在隧道外端，桥台与桥梁外端之间设置有接缝，所述多级连接装置两端分别设置在接缝两侧的桥台和桥梁上。本发明可有效地降低桥隧和铁路结构在地震作用下产生的损伤。
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| GB/T 7714 | 董慧慧 , 杨森 , 杜修力 . 一种基于隧道—桥梁一体化的多阶段协同抗震体系 : CN202310907419.4[P]. | 2023-07-21 . |
| MLA | 董慧慧 et al. "一种基于隧道—桥梁一体化的多阶段协同抗震体系" : CN202310907419.4. | 2023-07-21 . |
| APA | 董慧慧 , 杨森 , 杜修力 . 一种基于隧道—桥梁一体化的多阶段协同抗震体系 : CN202310907419.4. | 2023-07-21 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
本发明公开了一种双阶屈服金属弯曲阻尼器，包括上层钢板、下层钢板、带滑槽连接板、X型钢板、三角形钢板、滑动轴、连接螺钉、螺钉垫片。多块三角形钢板顶部置入上层钢板开槽当中，并与上层钢板焊接连接；三角形钢板下部预先开槽，并置入滑动轴，滑动轴两侧分别置入两块连接板中，两块连接板焊接在下层钢板上；在小震作用下阻尼器上下相对位移小，外侧两块X型钢板首先受弯进入屈服状态耗能，而中间三角形钢板在小震作用下处于弹性状态，未进入屈服阶段；在阻尼器受到大震作用时，上下两层钢板相对位移增大，三角形钢板也进入受弯屈服状态，两种钢板共同耗能。通过控制两种钢板的相关参数，本发明可起到在大震小震分别作用下分阶耗能的效果。
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| GB/T 7714 | 邱灿星 , 黄天艺 , 张爱芳 et al. 一种双阶屈服金属弯曲阻尼器 : CN202310048607.6[P]. | 2023-01-31 . |
| MLA | 邱灿星 et al. "一种双阶屈服金属弯曲阻尼器" : CN202310048607.6. | 2023-01-31 . |
| APA | 邱灿星 , 黄天艺 , 张爱芳 , 杜修力 . 一种双阶屈服金属弯曲阻尼器 : CN202310048607.6. | 2023-01-31 . |
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