黄土连拱隧道动态施工围岩损伤局部化研究  

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

作　　者：钟祖良[1,2,3] 刘新荣[1,2,3] 刘元雪[3] 李鹏[1,2] 王吉明[1,2] 

机构地区：[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

出　　处：《岩土力学》2012年第2期611-616,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.51108485);国家自然科学基金李晓红创新群体基金(No.50921063);重庆市科委自然科学基金计划资助项目(No.CSTC;2009BB6350)

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。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.

关 键 词：本构模型 损伤度 局部化 方案优化 

分 类 号：TU43[建筑科学—岩土工程]