Study of damage localization of loess multi-arch tunnel’s surrounding rock under dynamic construction

ZHONG Zu-liang; LIU Xin-rong; LIU Yuan-xue; LI Peng; WANG Ji-ming

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Study of damage localization of loess multi-arch tunnel’s surrounding rock under dynamic construction

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- Study of damage localization of loess multi-arch tunnel’s surrounding rock under dynamic construction
- Vol. 33, Issue 2, (2012)
- 作者机构：
  
  1. 重庆大学土木工程学院,重庆,400045
  2. 重庆大学山地城镇建设与新技术教育部重点实验室,重庆,400045
  3. 后勤工程学院建筑工程系,重庆,400041
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU43
- Online First：14 February 2012，
  
  Published：2012
- 稿件说明：
移动端阅览
ZHONG Zu-liang, LIU Xin-rong, LIU Yuan-xue, et al. Study of damage localization of loess multi-arch tunnel’s surrounding rock under dynamic construction[J]. 2012, 33(2).
DOI：

ZHONG Zu-liang, LIU Xin-rong, LIU Yuan-xue, et al. Study of damage localization of loess multi-arch tunnel’s surrounding rock under dynamic construction[J]. 2012, 33(2). DOI：

摘要

为了研究黄土连拱隧道动态施工时围岩的损伤情况和损伤分布规律，在室内试验的基础上推导了Q2黄土的弹塑性损伤本构模型，并基于FLAC3D平台编制了自定义本构模型，提出了损伤度概念并编制了损伤度后处理模块。以国内首条高速公路黄土连拱隧道-离石隧道为依托工程，对两种开挖方案施工时围岩损伤情况进行数值分析。研究表明，该成果可以较好地掌握隧道每一开挖步后围岩损伤度的分布情况和损伤区的演化规律，为施工方案优化选择提供依据。该研究成果为地下工程支护参数优化和方案的选择开辟了一个新的方向。

Abstract

In order to study the damage distribution of tunnel’s surrounding rock

firstly

an elastoplastic damage constitutive model of Q2 loess is deduced based on triaxial shear tests and compiled as a user-defined damage model( UDM ) of FLAC3D. Then the conception of surrounding rock damage degree (SRDD) is put forward and compiled into a post-processing module. Based on the first loess multi-arch tunnel of road–Lishi tunnel

the damage position of tunnel’s surrounding rock of two construction schemes is numerically simulated. The research results show that the SRDD and damage localization rules can be simulated well at every excavation step; and it also provides reference for the optimization of tunnel construction scheme. The research results provide a new method for the optimization of tunnel construction scheme and choice of construction scheme.

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