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学者姓名：许成顺
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摘要 ：
In this paper, we study the seismic behavior of pile group bridges in inclined liquefiable soil and reveal the failure mechanism by conducting large-scale shaking table tests. Two bridge models were supported by two foundations: a group pile in an inclined liquefiable site and a rigid foundation. Typical results of the model test under a strong event (Tabas 0.3 g) are illustrated, and the effects of soil-group pile-bridge interaction are explored. The inertial and kinematic effects of the pile-pier curvature are evaluated, and the seismic failure mechanisms of the pile-bridge system are revealed. The results demonstrated that the near-pile shallow soil exhibited significant shear dilation response during the occurrence of strong earthquakes, which induced acceleration spikes for both soil and structure. The interaction state was soil pushing the pile and pile pushing the soil during the first and the subsequent strong earthquake, respectively, due to the bridge P-Delta effect. The liquefaction-induced lateral spreading increased the kinematic effect and reduced the inertial effect on the pile head curvature. In addition, the inertial effect on the pile curvature decreased gradually from the shallow layer to the middle of liquefiable soil, while the kinematic effect increased gradually. The results also demonstrated that the rigid foundation assumption overestimated the acceleration demand of the bridge during strong earthquakes; however, it seriously underestimated the lateral displacement. Finally, the lateral spreading shifted the vulnerable position of the pile group-pier system from the pier bottom to the pile head and bottom, and the leading piles sustained more damage than the trailing piles.
关键词 ：
Lateral spreading Lateral spreading Soil-pile bridge interaction Soil-pile bridge interaction Liquefaction Liquefaction Seismic failure mechanism Seismic failure mechanism Shake-table test Shake-table test Pile group Pile group
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| GB/T 7714 | Jia, Kemin , Xu, Chengshun , El Naggar, M. Hesham et al. Experimental Study of Pile Group Bridge Failure Mechanism Caused by Liquefaction-Induced Lateral Spreading [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (3) . |
| MLA | Jia, Kemin et al. "Experimental Study of Pile Group Bridge Failure Mechanism Caused by Liquefaction-Induced Lateral Spreading" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 24 . 3 (2024) . |
| APA | Jia, Kemin , Xu, Chengshun , El Naggar, M. Hesham , Zhang, Xiaoling , Cui, Chunyi , Du, Xiuli . Experimental Study of Pile Group Bridge Failure Mechanism Caused by Liquefaction-Induced Lateral Spreading . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (3) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In this paper, we report on cyclic hollow cylinder tests on Fujian sand and Nanjing sand subjected to different loading frequencies. Depending on the loading frequencies we observed two distinct failure modes, i.e. cyclic mobility and cyclic instability. We proceed to develop a plasticity model to capture the features of our observations. The model employed a new flow rule for the effect of loading frequency on shear dilation and contraction characteristics to better reflect the changes in excess pore water pressure, deformation and strength of the saturated sand under cyclic loading. The model was validated by comparing numerical simulations with experimental results.
关键词 ：
Dilation Dilation Liquefaction Liquefaction Constitutive model Constitutive model Multiple yield surfaces Multiple yield surfaces Saturated sand Saturated sand Cyclic loading frequency Cyclic loading frequency
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| GB/T 7714 | Yue, Chong , Xu, Chengshun , Wu, Wei et al. Failure mechanisms of saturated sand under different loading frequencies: Experimental observation and constitutive modelling [J]. | COMPUTERS AND GEOTECHNICS , 2024 , 170 . |
| MLA | Yue, Chong et al. "Failure mechanisms of saturated sand under different loading frequencies: Experimental observation and constitutive modelling" . | COMPUTERS AND GEOTECHNICS 170 (2024) . |
| APA | Yue, Chong , Xu, Chengshun , Wu, Wei , Wang, Ruiqi , Du, Xiuli . Failure mechanisms of saturated sand under different loading frequencies: Experimental observation and constitutive modelling . | COMPUTERS AND GEOTECHNICS , 2024 , 170 . |
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摘要 ：
A simplified mechanical model for investigating pile-pile horizontal vibration is developed by combining the Pasternak model and the Timoshenko beam theory, with the consideration of the influence of axial load at the head of the source pile. The expressions for horizontal displacements and internal forces of the source pile are obtained with respect to the differential transform method and pile-soil boundary continuity conditions. Additionally, considering that the vibration of the source pile affects the dynamic displacements of the receiver pile, the dynamic equilibrium equation of the receiver pile is established. Then, a closed-formed solution for the response of the receiver pile is derived from the obtained expressions. Further, the pile-pile horizontal dynamic interaction factor is derived based on its definition and validated by comparison with existing related analytical solutions. Finally, the effects of the shear deformations of soil and pile, pile slenderness ratio, and axial load on the pile-pile horizontal dynamic interaction factors are examined. It is indicated that a smaller pile-to-soil modulus ratio of the near-surface layer results in a more significant effect of shear deformation of the soil. In particular, when L/d is small (i.e., L/d < 5) or the pile cross section is annular, the effect of shear deformation of the pile is not ignorable.
关键词 ：
Horizontal dynamic interaction factor Horizontal dynamic interaction factor Pile-pile horizontal vibration Pile-pile horizontal vibration Axial load Axial load Timoshenko beam Timoshenko beam Pasternak model Pasternak model
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| GB/T 7714 | Cui, Chunyi , Xin, Yu , Xu, Chengshun et al. Analytical Solution to Horizontal Vibrations of Large-Diameter Piles in Layered Pasternak Soils [J]. | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (5) . |
| MLA | Cui, Chunyi et al. "Analytical Solution to Horizontal Vibrations of Large-Diameter Piles in Layered Pasternak Soils" . | INTERNATIONAL JOURNAL OF GEOMECHANICS 24 . 5 (2024) . |
| APA | Cui, Chunyi , Xin, Yu , Xu, Chengshun , Zhang, Peng , Liang, Zhimeng , Liu, Hailong . Analytical Solution to Horizontal Vibrations of Large-Diameter Piles in Layered Pasternak Soils . | INTERNATIONAL JOURNAL OF GEOMECHANICS , 2024 , 24 (5) . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
In order to demonstrate the safety of the multi-well mining method, stratum deformation using multi-well systems is discussed. Firstly, ultrasonic experiments and triaxial tests of hydrate-bearing sediments under different confining pressure and hydrate saturation conditions were carried out. The soil static elastic modulus was compared with the dynamic elastic modulus relationship. Then the dynamic elastic modulus relations were applied to the multi-field coupling model to simulate the hydrate mining process in reservoirs by multi-well strategies. The experimental results show that hydrate saturation impacts the elastic modulus more than the effective confining pressure. In the simulation results, with the increase of the reservoir depth, the soil settlement shows a trend from small to large and then to small. The maximum soil displacement is located at the junction between the hydrate and the overlying layers, regarded as the weak point. In addition, increasing the well branches, expanding the well spacing, and increasing the wellhead radius can increase gas production. However, at the same time, it will also increase the reservoir deformation, thus posing risks to the stability of the formation and extraction wells. On this basis, the efficiency-safety factor was set, and the best mining scheme was determined.
关键词 ：
Dynamic elastic modulus Dynamic elastic modulus Multi-well system Multi-well system Hydrate reservoir Hydrate reservoir Strata settlement deformation Strata settlement deformation
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| GB/T 7714 | Huang, Linghui , Xu, Chengshun , Iqbal, Kamran et al. Hydrate reservoir deformation under multi-well strategies based on the dynamic elastic modulus relationship [J]. | GAS SCIENCE AND ENGINEERING , 2024 , 122 . |
| MLA | Huang, Linghui et al. "Hydrate reservoir deformation under multi-well strategies based on the dynamic elastic modulus relationship" . | GAS SCIENCE AND ENGINEERING 122 (2024) . |
| APA | Huang, Linghui , Xu, Chengshun , Iqbal, Kamran , Zhao, Yuqing . Hydrate reservoir deformation under multi-well strategies based on the dynamic elastic modulus relationship . | GAS SCIENCE AND ENGINEERING , 2024 , 122 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Transportation system (TS) and electric power system (EPS) play crucial roles in the functioning of modern societies. Disruptions to these systems can result in severe consequences, such as substantial economic losses and public safety concerns. The growing interdependencies of infrastructures have increased the vulnerability of TS and EPS to extreme events. However, previous works have not adequately considered the bidirectional interdependencies of TS and EPS when assessing their resilience under earthquake. This study develops a novel framework for evaluating the seismic resilience of urban transportation-electric power system. In such framework, functionality dependencies, resource-sharing interdependencies and restoration independencies are incorporated to represent the interaction between TS and EPS. A weighted connectivity efficiency-based metric is introduced to quantify network performance, considering both topological and flow characteristics. The framework also addresses uncertainties related to seismic damage and repair duration. A demonstrative study is conducted on a TS-EPS system located in Minneapolis, Minnesota. The results reveal the importance of considering the uncertainty factors on the prediction of network recovery trajectories and resilience. In addition, the effects of various enhancement strategies on network resilience are discussed.
关键词 ：
Electric power system Electric power system Transportation system Transportation system Interdependencies Interdependencies Seismic resilience Seismic resilience Uncertainty Uncertainty
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| GB/T 7714 | Zhang, Wangxin , Han, Qiang , Shang, Wen-Long et al. Seismic resilience assessment of interdependent urban transportation-electric power system under uncertainty [J]. | JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS , 2024 , 179 . |
| MLA | Zhang, Wangxin et al. "Seismic resilience assessment of interdependent urban transportation-electric power system under uncertainty" . | JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS 179 (2024) . |
| APA | Zhang, Wangxin , Han, Qiang , Shang, Wen-Long , Xu, Chengshun . Seismic resilience assessment of interdependent urban transportation-electric power system under uncertainty . | JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS , 2024 , 179 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
At present, the numerical analysis of the monopile foundation of an offshore wind turbine subject to complex environmental loads is a major challenge in engineering design. Based on the concept of the macroelement model, this paper proposes a straightforward, speedy, and accurate numerical tool. Firstly, the numerical limit analysis method is employed to investigate the three-dimensional failure envelope surface of a large-diameter monopile in sand, and the analytical formula of the three-dimensional failure envelope surface is obtained. Then, using the three-dimensional failure envelope and combining the basic principles of the hypoplastic theory, a hypoplastic macro-element of a large diameter monopile foundation in sand is proposed. The performance of the macroelement model is calibrated by comparing it to centrifuge test results of a small-diameter pile and three-dimensional finite element results of a large-diameter monopile under cyclic loading. Finally, the macroelement model is used to analyze the performance of the OWT large-diameter monopile foundation under wind and wave loads. The results indicate that the macro-element model can precisely reproduce the performance of large-diameter monopile foundations under cyclic loading, and can effectively and accurately solve the complex pile-soil interaction problem of OWT large diameter monopiles under cyclic loading.
关键词 ：
Hypoplasticity Hypoplasticity Monopile Monopile Macroelement Macroelement Offshore wind turbine Offshore wind turbine
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| GB/T 7714 | Meng, Xiaowei , Zhai, Endi , Xu, Chengshun . A hypoplastic macroelement model for offshore wind turbine large-diameter monopiles in sand [J]. | OCEAN ENGINEERING , 2024 , 294 . |
| MLA | Meng, Xiaowei et al. "A hypoplastic macroelement model for offshore wind turbine large-diameter monopiles in sand" . | OCEAN ENGINEERING 294 (2024) . |
| APA | Meng, Xiaowei , Zhai, Endi , Xu, Chengshun . A hypoplastic macroelement model for offshore wind turbine large-diameter monopiles in sand . | OCEAN ENGINEERING , 2024 , 294 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper aims to evaluate the failure probability of buried pipelines under pulse-like ground motions based on the seismic records detected during the Kahramanmaras, earthquake in Turkey. The incremental dynamic analysis (IDA) method was used to evaluate the vulnerability of continuous and segmented steel pipes, taking into account the corrosion effect in alkaline and near-neutral soil environments. The results show that pulse-like ground motion can significantly impact the fragility of buried pipelines, particularly segment steel pipelines. Moreover, the failure probability of buried pipelines tends to increase with service age, although the rate of failure gradually decreases. Empirical models notably underestimate the failure probability of buried pipelines under pulse-like ground motion, so they should be used cautiously in engineering application. These insights contribute to advancing our understanding of the seismic fragility of buried pipelines.
关键词 ：
Pulse -like ground motions Pulse -like ground motions Buried pipeline Buried pipeline Fragility analysis Fragility analysis Incremental dynamic analysis Incremental dynamic analysis
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| GB/T 7714 | Wang, Xiaoqiang , Han, Junyan , Kang, Anqi et al. Seismic fragility analysis of buried pipelines under Kahramanmaras, ground motions [J]. | ENGINEERING GEOLOGY , 2024 , 337 . |
| MLA | Wang, Xiaoqiang et al. "Seismic fragility analysis of buried pipelines under Kahramanmaras, ground motions" . | ENGINEERING GEOLOGY 337 (2024) . |
| APA | Wang, Xiaoqiang , Han, Junyan , Kang, Anqi , El Naggar, M. Hesham , Miao, Huiquan , Xu, Chengshun . Seismic fragility analysis of buried pipelines under Kahramanmaras, ground motions . | ENGINEERING GEOLOGY , 2024 , 337 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
This paper presents the design and commissioning of a novel pseudo-static test apparatus for underground structures that accounts for soil-structure interaction by simulating the soil with suitably designed springs. The developed apparatus was employed to conduct 1:10 large scale tests on a two-story three-span prefabricated subway station structure. Two comparative cyclic load tests were conducted: one involved the developed springs-structure system; and one involved the structure alone (no springs). The test results demonstrated important differences in the damage location, damage degree, bearing capacity, and deformation capacity of the prefabricated subway station structure under the two loading conditions (i.e., with and without springs). The presence of springs (i.e., soil-structure interaction) enhanced the lateral collapse resistance of the underground structure and affected the inter-story displacement ratio (IDR) between the upper and lower layers of the two-story prefabricated subway station structure. However, it did not affect the deformation coordination of the walls and columns of each layer. A finite element model of the prototype station was also established to conduct dynamic time history analysis simulating the soil-structure interaction. The results from the dynamic analysis validated the effectiveness of the pseudo-static test method employing the spring-structure system. The excellent agreement between the calculated dynamic responses and the responses obtained from the pseudo static tests confirmed the ability of the developed apparatus to conduct seismic tests on complex large-scale underground structures such as prefabricated subway stations. Thus, this test methodology might be utilized to attain valuable insights into the seismic performance of prefabricated subway stations at a relatively low cost and effort.
关键词 ：
numerical analysis numerical analysis prefabricated subway station prefabricated subway station seismic damage seismic damage pseudo-static test pseudo-static test spring-structure system spring-structure system underground structure underground structure
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| GB/T 7714 | Chen, Jinnan , Xu, Chengshun , Du, Xiuli et al. Design and commissioning of novel test apparatus for underground structures and its application in seismic damage testing of prefabricated subway station [J]. | EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS , 2024 , 53 (4) : 1573-1592 . |
| MLA | Chen, Jinnan et al. "Design and commissioning of novel test apparatus for underground structures and its application in seismic damage testing of prefabricated subway station" . | EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS 53 . 4 (2024) : 1573-1592 . |
| APA | Chen, Jinnan , Xu, Chengshun , Du, Xiuli , El Naggar, Hesham M. , Han, Runbo . Design and commissioning of novel test apparatus for underground structures and its application in seismic damage testing of prefabricated subway station . | EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS , 2024 , 53 (4) , 1573-1592 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Under depressurization, the hydrate reservoirs undergo complex mechanical behaviors such as consolidation or shear. To deeply understand the evolution in the mechanical properties of soil, triaxial equipment with an ultrasonic system was used to detect the shear wave velocity in hydrate-bearing sediments. The effects of hydrate saturation, water, and stress state on shear-wave velocity are studied. The experimental results show that: The hydrate saturation significantly affects the wave velocity in the hydrate formation stage, while the water content has little influence on it. During the consolidation period, the notable increase in shear wave velocity indicates a decrease in soil void ratio, which means the soil has significant settlement deformation. With continuous shearing, the soil elastic modulus is damaged, and finally, the maximum damage can reach 35%. The conclusions can deepen understanding of the physical and mechanical properties of hydrate-bearing sediments in permafrost, and provide a reference for predicting the stratum stability during hydrate exploitation.
关键词 ：
Elastic modulus damage Elastic modulus damage Shear -wave velocity Shear -wave velocity Acoustic experiments Acoustic experiments Void ratio Void ratio Hydrate -bearing sediments Hydrate -bearing sediments
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| GB/T 7714 | Huang, Linghui , Xu, Chengshun , Iqbal, Kamran . Acoustic properties of hydrate-bearing sediments in permafrost from hydrate formation to shear processes [J]. | COLD REGIONS SCIENCE AND TECHNOLOGY , 2024 , 224 . |
| MLA | Huang, Linghui et al. "Acoustic properties of hydrate-bearing sediments in permafrost from hydrate formation to shear processes" . | COLD REGIONS SCIENCE AND TECHNOLOGY 224 (2024) . |
| APA | Huang, Linghui , Xu, Chengshun , Iqbal, Kamran . Acoustic properties of hydrate-bearing sediments in permafrost from hydrate formation to shear processes . | COLD REGIONS SCIENCE AND TECHNOLOGY , 2024 , 224 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Interdependent infrastructure systems play a critical role in the normal operation and postdisaster emergency response in modern cities. However, they are vulnerable to earthquakes throughout their service life, resulting in substantial economic losses and public safety concerns. The threat posed by earthquakes underscores the necessity of implementing risk mitigation strategies. In this paper, an emergency resilience-driven decision model is proposed to address the optimization problem of seismic retrofitting of infrastructure systems. Two types of interdependencies are introduced to reflect the interaction within the infrastructure systems. Then, a resilience metric based on weighted emergency connectivity efficiency is defined to evaluate the ability of a community to provide emergency services under earthquake risks. In addition, a mathematical model and its solution algorithm are developed to maximize emergency resilience benefits while minimizing retrofitting costs, considering resource and probabilistic performance constraints during the emergency response phase. To demonstrate the applicability of the decision model, a case study is conducted on the Centerville community under seismic hazard. The results demonstrate the effectiveness of the decision model in evaluating community emergency resilience and identifying retrofit strategies that align with both resilience benefits and cost optimization criteria. Additionally, the sensitivity analysis results indicate that the intensity of interdependency may significantly affect the optimal seismic retrofit strategies and associated resilience benefits.
关键词 ：
Resilience Resilience Seismic hazard Seismic hazard Infrastructure networks Infrastructure networks Retrofit strategies Retrofit strategies Multiobjective optimization model Multiobjective optimization model
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| GB/T 7714 | Zhang, Wangxin , Han, Qiang , Wen, Jianian et al. Emergency Resilience-Driven Retrofit Strategies for Urban Interdependent Infrastructure Systems under Seismic Hazard [J]. | JOURNAL OF INFRASTRUCTURE SYSTEMS , 2024 , 30 (4) . |
| MLA | Zhang, Wangxin et al. "Emergency Resilience-Driven Retrofit Strategies for Urban Interdependent Infrastructure Systems under Seismic Hazard" . | JOURNAL OF INFRASTRUCTURE SYSTEMS 30 . 4 (2024) . |
| APA | Zhang, Wangxin , Han, Qiang , Wen, Jianian , Xu, Chengshun . Emergency Resilience-Driven Retrofit Strategies for Urban Interdependent Infrastructure Systems under Seismic Hazard . | JOURNAL OF INFRASTRUCTURE SYSTEMS , 2024 , 30 (4) . |
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