Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault
The steeply dipped fault zone is the weak link of the seismic stability of underground caverns. Aimed at the complex dynamic interaction characteristics between the surrounding rock and fault, based on the Ladanyi's shear strength model, the seismic deterioration coefficient was introduced, and...
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| Format: | Article |
| Language: | English |
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SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717
2021-08-01
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| Series: | Rock and Soil Mechanics |
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| Online Access: | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2020.6886 |
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| author | CHEN Shi-jie XIAO Ming WANG Xiao-wei CHEN Jun-tao |
| author_facet | CHEN Shi-jie XIAO Ming WANG Xiao-wei CHEN Jun-tao |
| author_sort | CHEN Shi-jie |
| collection | DOAJ |
| description | The steeply dipped fault zone is the weak link of the seismic stability of underground caverns. Aimed at the complex dynamic interaction characteristics between the surrounding rock and fault, based on the Ladanyi's shear strength model, the seismic deterioration coefficient was introduced, and a shear strength model considering nonlinear mechanical properties and seismic deterioration effect was established. Further considering the discontinuous deformation characteristics between surrounding rock and faults, a three-dimensional dynamic contact force method was proposed considering both the complex shear strength and multiple contact states. The method was applied to the Jinchuan underground powerhouse to study its seismic damage characteristics under the influence of the steeply dipped fault F31. The results indicate that after considering the interface and seismic deterioration effects, the seismic response of the cavern increases, the dislocation between the surrounding rock and fault is more evident, and a certain depth of separation and sliding failure zones occurs. The steeply dipped fault cuts the high sidewalls of the main workshop, and forms a weak zone where the surrounding rock thickness is thin. The weak zone has more significant deformation and damage, and is prone to flexural toppling deformation and slipping deformation into the cavern on the upstream and downstream sidewalls, respectively. The distribution of the sliding and separation failure zone of the interfaces between the surrounding rock and fault are dynamic changes during the seismic process, and it continues to extend to the deep. Among them, the separation zone is relatively large at the arch abutment and rock anchoring beam. The numerical results reveal the dynamic failure mechanism of the surrounding rock of the underground cavern intersected by a steeply dipped fault, which can provide a reference for the seismic design. |
| first_indexed | 2024-04-11T21:37:26Z |
| format | Article |
| id | doaj.art-4f0ef8baf4154d9f8a7e88f19e4ab534 |
| institution | Directory Open Access Journal |
| issn | 1000-7598 |
| language | English |
| last_indexed | 2024-04-11T21:37:26Z |
| publishDate | 2021-08-01 |
| publisher | SCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717 |
| record_format | Article |
| series | Rock and Soil Mechanics |
| spelling | doaj.art-4f0ef8baf4154d9f8a7e88f19e4ab5342022-12-22T04:01:42ZengSCIENCE PRESS , 16 DONGHUANGCHENGGEN NORTH ST, BEIJING, PEOPLES R CHINA, 100717Rock and Soil Mechanics1000-75982021-08-014292600261010.16285/j.rsm.2020.6886Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped faultCHEN Shi-jie0 XIAO Ming1WANG Xiao-wei2CHEN Jun-tao31. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China 3. Changjiang Institute of Survey, Planning, Design and Research, Wuhan, Hubei 430010, China1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan, Hubei 430072, ChinaThe steeply dipped fault zone is the weak link of the seismic stability of underground caverns. Aimed at the complex dynamic interaction characteristics between the surrounding rock and fault, based on the Ladanyi's shear strength model, the seismic deterioration coefficient was introduced, and a shear strength model considering nonlinear mechanical properties and seismic deterioration effect was established. Further considering the discontinuous deformation characteristics between surrounding rock and faults, a three-dimensional dynamic contact force method was proposed considering both the complex shear strength and multiple contact states. The method was applied to the Jinchuan underground powerhouse to study its seismic damage characteristics under the influence of the steeply dipped fault F31. The results indicate that after considering the interface and seismic deterioration effects, the seismic response of the cavern increases, the dislocation between the surrounding rock and fault is more evident, and a certain depth of separation and sliding failure zones occurs. The steeply dipped fault cuts the high sidewalls of the main workshop, and forms a weak zone where the surrounding rock thickness is thin. The weak zone has more significant deformation and damage, and is prone to flexural toppling deformation and slipping deformation into the cavern on the upstream and downstream sidewalls, respectively. The distribution of the sliding and separation failure zone of the interfaces between the surrounding rock and fault are dynamic changes during the seismic process, and it continues to extend to the deep. Among them, the separation zone is relatively large at the arch abutment and rock anchoring beam. The numerical results reveal the dynamic failure mechanism of the surrounding rock of the underground cavern intersected by a steeply dipped fault, which can provide a reference for the seismic design.http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2020.6886underground cavernsteeply dipped faultdynamic contact methodseismic responsedamage characteristics |
| spellingShingle | CHEN Shi-jie XIAO Ming WANG Xiao-wei CHEN Jun-tao Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault Rock and Soil Mechanics underground cavern steeply dipped fault dynamic contact method seismic response damage characteristics |
| title | Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault |
| title_full | Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault |
| title_fullStr | Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault |
| title_full_unstemmed | Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault |
| title_short | Numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault |
| title_sort | numerical analysis of seismic damage characteristics of an underground cavern intersected by a steeply dipped fault |
| topic | underground cavern steeply dipped fault dynamic contact method seismic response damage characteristics |
| url | http://rocksoilmech.whrsm.ac.cn/EN/10.16285/j.rsm.2020.6886 |
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