|Table of Contents|

Stability analysis of surrounding rock of tunnel passing through different fault fracture zones(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年05期
Page:
162-173
Research Field:
隧道工程
Publishing date:

Info

Title:
Stability analysis of surrounding rock of tunnel passing through different fault fracture zones
Author(s):
HAN Yuxuan1;  JIANG Tengfei2;  TAN Bige3;  XIE Yuan4;  LAI Jinxing2;  QIU Junling2
(1. Sichuan Rail Transit Investment Co., Ltd, Chengdu 610023, Sichuan, China; 2. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 3. Sichuan Dujin Mountain Rail Transit Co., Ltd, Chengdu 611830, Sichuan, China; 4. China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China)
Keywords:
fault fracture zone;  stability of surrounding rock;  numerical simulation;  dip angle;  thickness;  tendency
PACS:
U451.2
DOI:
10.19815/j.jace.2021.12094
Abstract:
In order to analyze the influence of the tunnel passing through different fault fracture zones on the stability of surrounding rock, based on the Wulipo tunnel project of Mianjiu expressway, the influence of the tunnel passing through different dip angle, thicknesses and tendency patterns on the stability of tunnel surrounding rock was simulated and analyzed by using ANSYS Workbench parametric modeling platform and FLAC 3D finite difference software. In the process of modeling, the control variable method was used to study the influence of the single variable by changing the fault dip angle, thickness and tendency respectively. The results show that when the tunnel passes through different forms of faults, the vertical deformation, horizontal convergence, plastic zone distribution of surrounding rock and the contact pressure between surrounding rock and initial support will be affected. In a certain range, the change of fault dip angle and thickness has a great impact on the stability of surrounding rock. The greater the dip angle, the more conducive to the stability of surrounding rock, and the influence of fault thickness is just the opposite. When the fault dip tendency changes between 0 °-45 °, it has little effect. The influence degree of each factor on the vault settlement from large to small is fault thickness, fault dip angle and fault tendency. For the horizontal displacement of the side wall, the fault dip angle has the greatest influence, followed by the fault thickness, and the fault tendency has little effect. During construction, the tunnel should be orthogonal to the fault as much as possible or avoid the fault with large thickness to improve the stability of surrounding rock. The research results have certain reference and guiding significance for similar projects.

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Last Update: 2023-09-01