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FEM analyses of stress and deformation of a flexible inner pressure bolt

Journal of China University of Mining and Technology 2008年第4期18卷 584-587,593页

作者： CHEN Zhong-he WANG Wei-qiang ZHANG Le-wen School of Chemistry and Chemical Engineering Jinan University Jinan Shandong 250022 China School of Mechanical Engineering Shandong University Jinan Shandong 250061 China Shandong Research Center of Geotechnical and Structure Engineering Technology Jinan Shandong 250061 China

The flexible inner pressure bolt is a new kind and new structural bolt (anchor rod). A number of structural improvements and performance test have been carried out. The bolt has superior compatibility to the soft crag and the large distortion tunnel with its flexibility. In order to study its stress, deformation and interaction mechanism thoroughly, a number of large distortion calcula- tions and analyses have been carried out on the bolt by FEM (finite element method), especially with the ANSYS software, based on the updated Lagrangian law. The results show that the maximum stress of the inner wall of the bolt is consistent with an elastic analytic solution. The maximum stress on the body occurs in the vicinity of the enhancement material. The link enhancement of the body seems to be quite essential. The experimental results indicate that the maximum injection pressure in the bolt is 2.5 MPa without link enhancement and 8.3 MPa with the enhancement. This link enhancement effect is highly significant. These results provide some basis for the design, application and anchoring stress analysis of the bolt.

关键词： flexible inner pressure bolt stress and deformation FEM large distortion calculation

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Mechanical performances of shield tunnel segments under asymmetric unloading induced by pit excavation

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第6期15卷 1547-1564页

作者： Gang Wei Feifan Feng Chengbao Hu Jiaxuan Zhu Xiao Wang Department of Civil Engineering Hangzhou City UniversityHangzhou310015China Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province Hangzhou310015China Zhejiang Engineering Research Center of Intelligent Urban Infrastructure Hangzhou310015China College of Civil Engineering and Architecture Zhejiang UniversityHangzhou310058China

To explore the stress and deformation responses,as well as the failure characteristics of the shield tunnel segment of Hangzhou Metro under the influences of pit excavation and other surrounding projects,a self-developed“shield tunnel segment hydraulic loading system”was used to carry out full-scale loading tests on the three-ring staggered assembled *** structural performances and failure process of the tunnel segment under step-by-step asymmetric unloading were studied.A safety index was proposed to describe the bearing capacity of the ***,a finite element model(FEM)was established to analyze the bearing capacity of segment using the test ***,the effect of reinforcement with a steel plate on the deformation and bearing capacity of the segment was *** results showed that under asymmetric unloading,the peak value and amplitude of the bending moment on the near unloading side converged with a greater value than those on the far *** concrete internal force exhibited a directional transformation at different load *** first appeared at the 180inner arc surface of the bottom standard block and then expanded to both sides,while the rate of crack propagation of the outer arc surface was relatively *** bearing capacity of the segments can be evaluated by the combination of the factors,*** residual bearing capacity coefficient,moment transfer coefficient,and characterization *** segments approaching failure can facilitate the increase in the residual bearing capacity coefficient by more than 50%.This can provide guidance for the service assessment of metro tunnel operations.

关键词： Shield tunnel segment Full-scale test Asymmetric unloading stress and deformation Safety index

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stress-strain analysis of Aikou rockfill dam with asphalt-concrete core

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Journal of Rock Mechanics and Geotechnical Engineering 2011年第2期3卷 186-192页

作者： Chaoyang Fang, Zhenzhen Liu State Key Laboratory of Water Resources and Hydropower Engineering Sciences, Wuhan University, Wuhan, 430072, China State Key Laboratory of Water Resources and Hydropower Engineering Sciences Wuhan University Wuhan 430072 China

Aikou rockfill dam with asphalt-concrete core is situated in a karst area in Chongqing City, China. In order to study the operative conditions of the rockfill dam, especially those of the asphalt-concrete core, the Duncan model is adopted to compute the stress and strain of both the rockfill dam and the asphalt-concrete core after karst grouting and other treatments. The results indicate that the complicated stress and deformation of both the dam body and the core are within reasonable ranges. It is shown that structure design and foundation treatment of the dam are feasible and can be used as a reference for other similar projects.

关键词： asphalt-concrete core rockfill dam Aikou reservoir stress and deformation

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