|Table of Contents|

Deformation Characteristics and Treatment Measures of Tunnels in Soft and Hard Interbedded Surrounding Rock with Tilted Stratum(PDF)

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

Issue:
2021年06期
Page:
186-196
Research Field:
软土隧道施工与变形控制
Publishing date:

Info

Title:
Deformation Characteristics and Treatment Measures of Tunnels in Soft and Hard Interbedded Surrounding Rock with Tilted Stratum
Author(s):
ZHANG Li-xin1;  CHEN Li-jun1;  CHEN Jian-xun1;  WANG Zhi-jiao2;  WANG Zhi-cai2;  LIU Wei-wei1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Gansu Changda Highway Co., Ltd., Lanzhou 730050, Gansu, China)
Keywords:
tunnel engineering;  deformation characteristic;  numerical simulation;  primary support;  dip inclination of rock stratum;  control measure
PACS:
U451.2
DOI:
10.19815/j.jace.2021.04102
Abstract:
In order to study the deformation characteristics of soft and hard interbedded surrounding rock tunnels under different rock dip inclination with tilted stratum, the Muzhailing expressway tunnel project from Weiyuan to Wudu was selected as the research object. The field investigation and field monitoring were carried out for the tunnel with carbonaceous phyllite and sandy slate interbedded surrounding rock. The deformation characteristics and influencing factors of the tunnel were analyzed. A three-dimensional numerical model was established using the finite difference software FLAC 3D to study the deformation law of the tunnel under different rock dip inclinations.According to different deformation characteristics, the corresponding control measures were summarized. The results show that the tunnel deformation is mainly affected by the dip inclination and groundwater. Under the tilted stratum, the tunnel presents obvious asymmetric deformation, and the rock stratum on one side of the tunnel is prone to bending deformation and failure. The prestressed anchor cable with “asymmetric layout and long-short combination” should be used to strengthen the surrounding rock. Under the condition of groundwater collection, the stratum on the other side is prone to bedding sliding failure along the weak plane. Attention should be paid to drainage to avoid the groundwater gathering behind the primary support, so as to reduce the influence of groundwater on the stability of surrounding rock and the deformation of primary support. When the dip inclination is less than 50°, the settlement of tunnel is greater than the horizontal convergence deformation. When the dip inclination is greater than 50°, the horizontal convergence deformation is greater than the settlement of tunnel. The maximum settlement deformation changes in the form of trigonometric function with the dip inclination. When the dip inclination is in the range of 40° to 50°, the settlement deformation reaches the maximum. The maximum convergence deformation changes exponentially with the dip inclination of the rock. With the increase of rock dip inclination, the convergence deformation of tunnel becomes more significant.

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Last Update: 2021-11-01