|Table of Contents|

Research on key construction technology of layered soft rock tunnel under different large deformation grades(PDF)

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

Issue:
2023年05期
Page:
148-161
Research Field:
隧道工程
Publishing date:

Info

Title:
Research on key construction technology of layered soft rock tunnel under different large deformation grades
Author(s):
PAN Wentao1;  WU Fangyin1;  YANG Wenbo1;  KOU Hao1;  XU Di2;  MENG Hailong2;  HE Chuan1;  WANG Fei2
(1. Key Laboratory of Transportation Tunnel Engineering of Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Sichuan Mianjiu Expressway Co., Ltd., Chengdu 610041, Sichuan, China)
Keywords:
tunnel engineering;  construction technology;  numerical simulation;  layered soft rock;  large deformation grade;  on-site monitoring
PACS:
U456.3
DOI:
10.19815/j.jace.2022.01084
Abstract:
In order to explore the construction scheme of layered soft rock tunnel under different large deformation grades, relying on large deformation tunnels of Jiumian expressway, the comparative working conditions were preliminarily established according to the on-site construction and effect. Surrounding rock parameters were determined by experiments and the stress and deformation of surrounding rock and supporting structures under different working conditions were compared and verified by numerical simulation. Construction method, advance reinforcement and lining support schemes were determined under different large deformation grades and verified by on-site construction and structural stress. The results show that on-site large deformation grade and amount show aggregation. The deformation of vault and spandrel are close under slight large deformation, and the medium and strong large deformation is concentrated on the vault or the arch waist. Under slight large deformation, the two steps method should be adopted. It is of little significance to strengthen single-layer small conduit and adopt the combination of long and short bolts. The three steps method should be adopted for medium large deformation, and single-layer small conduit(φ51, 6 m long)and the combination of long and short bolts should be adopted. Under strong large deformation, it should use three steps to retain core soil method, expanding the vault grouting range, and adopting double-layer initial support. According to the project importance, the advance reinforcement method of double-layer small conduit and middle pipe shed is selected.

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Last Update: 2023-09-01