|Table of Contents|

Analysis of influence of excavation methods on deformation of shallow-buried bias tunnels across base and cover interface(PDF)

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

Issue:
2023年03期
Page:
111-120
Research Field:
隧道工程
Publishing date:

Info

Title:
Analysis of influence of excavation methods on deformation of shallow-buried bias tunnels across base and cover interface
Author(s):
YANG Xiaohua1;  CAO Yangfan1;  XIAO Jing2;  HU Ruiqing3;  YE Fei1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. CCCC Second Harbor Engineering Company Ltd., Wuhan 430040, Hubei, China; 3. China Railway First Survey and Design Institute Group Co., Ltd., Xi'an 710043, Shaanxi, China)
Keywords:
tunnel engineering;  shallow-buried bias tunnel;  reserved core earthen method for ring excavation;  three-step seven-step excavation method;  CD method;  CRD method
PACS:
TU92
DOI:
10.19815/j.jace.2021.11023
Abstract:
The colluvial deposit-limestone junction section(soil-rock junction section)is partly loose slope deposit and partly rock mass. The engineering properties are quite different. Different tunnel excavation methods can have a significant impact on the stability of the tunnel. Based on a tunnel project of Jiuzhaigou—Mianyang Expressway in Sichuan province, the model test and numerical simulation methods were used to study the stress and deformation characteristics of shallow-buried bias tunnel in the contact area of colluvial deposit-limestone with the condition of retaining wall pre-reinforcement measures under four different excavation methods, which consist reserved core earthen method for ring excavation, three-step seven-step excavation method, CD method and CRD method. The results show that the surface settlement of shallow-buried bias tunnel in soil-rock junction section shows obvious asymmetric characteristics, and the maximum surface settlement under four excavation methods all shifts to the left. The maximum displacement of surrounding rock produced by the four excavation methods occurs at the vault of the tunnel, and the settlement values of the right arch shoulder and the right arch waist are smaller than that of the left arch shoulder and the left arch waist. The maximum value of the maximum principal stress of the four excavation methods appears at the right arch waist of the tunnel, while the maximum value of the minimum principal stress appears at the right arch foot of the tunnel. Compared with the three-step seven-step excavation method, the reserved core earthen method for ring excavation, CD method and CRD method can ensure the safety of tunnel construction to the greatest extent.

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Last Update: 2023-05-20