Influence of fault dislocation on water conveyance tunnel(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年5期
- Page:
- 96-106
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Influence of fault dislocation on water conveyance tunnel
- Author(s):
- ZHAO Xu; CHENG Dingjia; DAI Zhijie; LI Ruohan; WANG Zhen
- (1. The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of〖JP〗Technology, Beijing 100124, China; 2. Beijing Key Lab of Earthquake Engineering and Structural Retrofit,Beijing University of Technology, Beijing 100124, China; 3. Shijiazhuang Yayan Estate Development Company,Shijiazhuang 050800， Hebei, China; 4. College of Civil Engineering, Tongji University, Shanghai 200092, China)
- Keywords:
- tunnel engineering; fault dislocation; numerical simulation; dislocation mode; dislocation distance; distribution law of internal force
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the failure law of tunnel structure under fault dislocation, ABAQUS software was used to establish a numerical calculation model, and the calculation results were analyzed to reveal the mechanism of earthquake failure. Firstly, a numerical model was established to study three forms of fault dislocation, thrust fault dislocation, strikeslip fault dislocation, and inclinedslip fault dislocation. The distance of fault dislocation was selected according to engineering data and regression formula, and the fault dislocation was selected. The dynamic distance was applied to the model step by step, and the changes of the tunnel bending moment, shear force and internal force of the lining along the axial direction of the tunnel were analyzed, and the safety range of the lining was judged according to relevant specifications. The results show that with the dislocation of the fault, the internal force of the tunnel changes sharply with the displacement of the fault, 10 m away from the bottom wall of the fracture surface, and the influence of the fault dislocation on the tunnel is more concentrated and intense. In this model, the strikeslip fault has the largest influence on the tunnel, the influence range of the inclinedslip fault on the tunnel is the second, and the influence range of the thrust fault on the tunnel is the smallest. The influence of the dislocation of the inclinedslip fault on the tunnel stress lies between the thrust fault and the strikeslip fault. The maximum principal stress peak of the tunnel under the strikeslip fault dislocation appears at the arch waist, and the inclinedslip fault dislocation causes the stress peak to appear on the vault and arch bottom of the tunnel. After a certain distance away from the fracture surface, the maximum principal stress of the tunnel gradually decrease and approach a smaller value. At this time, the lining is safe, indicating that the fault dislocation has a limited range of influence on the tunnel. Combined with the relevant specifications, according to the engineering background considered in the article, it is found that the tunnel lining 65 m away from the fracture surface is safe, and, it can provide a reference to actual project. 9 tabs, 16 figs, 26 refs.
Last Update: 2021-09-30