|Table of Contents|

Treatment and Effect Analysis of Collapse and Roof Fall in Shallow Buried Loess Tunnel Entrance(PDF)

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

Issue:
2021年05期
Page:
118-126
Research Field:
Publishing date:

Info

Title:
Treatment and Effect Analysis of Collapse and Roof Fall in Shallow Buried Loess Tunnel Entrance
Author(s):
YANG Xiao-hua1;  XIAO Jing1;  XIN Yan-fu2;  WANG An-le3;  ZHENG Kun-long1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Gansu Provincial Highway Aviation Tourism Investment Group Co., Ltd, Lanzhou 730030, Gansu, China; 3. Xi'an Branch of Municipal Engineering Supervision Co., Ltd, Xi'an 710068, Shaanxi, China)
Keywords:
loess tunnel;  collapse and roof fall;  treatment measure;  initial support;  monitoring measurement
PACS:
TU312
DOI:
10.19815/j.jace.2020.09053
Abstract:
Aiming at the treatment project of the collapse and roof fall accident at the left exit of a loess tunnel on the Shitian expressway, the influence factors of the collapse and roof fall in the tunnel were analyzed. Such comprehensive treatment measures as small pipe grouting for strengthening the surrounding rock, treatment inside tunnel and surface treatment were put forward, and according to the engineering practice that the initial support strength is insufficient, three initial support schemes were designed. Aiming at the three initial support schemes, the stress and deformation of the surrounding rock and supporting structure during tunnel excavation were analyzed by large numerical analysis software FLAC 3D. The results show that the initial supporting system stiffness under working condition 1(I25a steel frame + 30 cm thick shotcrete)is relatively large, and the initial supporting capacity is surplus. The initial supporting system stiffness under working condition 3(I20a steel frame + 25 cm thick shotcrete)is small. In order to ensure the safety of tunnel construction and take into account the construction cost, the initial support system under working condition 2(I22a steel frame + 28 cm thick shotcrete)should be adopted. The field measured data show that after the treatment, the tunnel deformation is small and the maximum crown settlement is 16.4 mm, the maximum crown settlement rate is 2.2 mm·d-1, the maximum peripheral convergence is 11.3 mm, the maximum peripheral convergence rate is 1.6 mm·d-1, and the maximum ground settlement is 46.6 mm. All the relevant change values are within the standard range, revealing that the treatment effect is good. The research results can provide a reference for prevention and treatment of collapse and roof fall of loess tunnel.

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Last Update: 2021-09-01