|Table of Contents|

Influence of Supporting Parameters of Phyllite Deep Tunnel on Structural Stress and Deformation(PDF)

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

Issue:
2020年03期
Page:
108-117
Research Field:
Publishing date:

Info

Title:
Influence of Supporting Parameters of Phyllite Deep Tunnel on Structural Stress and Deformation
Author(s):
YANG Xiao-hua;  ZHAO Bin-jing;  WU Hao;  LI Ai-ming
(School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
deep highway tunnel;  sericite phyllite;  field testing;  supporting structure;  stress;  deformation
PACS:
TU311
DOI:
10.19815/j.jace.2019.08054
Abstract:
In order to explore the influence of supporting parameters on the stress and deformation of the structure of No.2 tunnel of ChengWu Expressway, based on laboratory test, in-situ test and field test, the engineering characteristics of surrounding rock of tunnel, the variation laws of surrounding rock pressure of initial support, contact pressure of secondary lining, vault subsidence, peripheral convergence-time curve were studied. Three supporting parameter schemes were put forward, including increasing the rigidity of single initial support, adopting double initial support and increasing the rigidity of double initial support. Based on the original supporting scheme and three supporting parameter schemes, four working conditions were established to determine the influence of different supporting parameters on the stress and deformation of the tunnel structure by using FLAC3D finite difference software. The results show that in the simulation results of the original support scheme, when the vertical displacement of the arch crown and the horizontal displacement of the arch foot tend to be stable, the values are 185.57 mm and 330.51 mm, and the relative errors with the field test results are 5.5% and 7.5% respectively. When the single-layer initial support is adopted, the steel arch spacing is adjusted from 75 m to 60 m, the steel arch type is adjusted from I18 to I22, and the vertical displacement at the vault is 161.45 mm, which is 13% less than the original design simulation results. The horizontal displacement at the arch foot is 273.21 mm, reducing by 17.3%, and the stress concentration at the right arch waist is 11.18 MPa, reducing by 9.1%. When the double-layer initial support is adopted, the spacing and type of steel arch in the two layers are the same as the original support design, which are 75 m and I18. The vertical displacement of the arch crown is 130.58 mm, which is 29.6% less than the original design simulation results. The horizontal displacement of the arch foot is 227 mm, which is 31.3% less. The stress concentration value of the right arch waist is 8.24 MPa, which is 33.0% less. When the two-layer initial support is adopted, the steel arch spacings in the two floors are both is 60 m, and the model is I22. The vertical displacement at the vault is 80.56 mm, which is 56.6% less than the original design simulation result. The horizontal displacement at the arch foot is 159.34 mm, reducing by 51.8%. The stress concentration at the right arch waist is 6.13 MPa, reducing by 50.2%. In this case, the stress and deformation of the tunnel support structure are the best. The settlement of the arch crown is 80 mm, and the peripheral convergence is 160 mm.

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Last Update: 2020-06-08