降雨作用下浅埋隧道松散围岩塌方机制  

Study on collapse mechanism in loose wall rock of shallow tunnel under rainfall

作　　者：王迎超[1,2] 尚岳全[2] 严细水[2] 徐兴华[2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,力学与建筑工程学院,江苏徐州221008 [2]浙江大学建筑工程学院,杭州310058

出　　处：《哈尔滨工业大学学报》2012年第2期142-148,共7页Journal of Harbin Institute of Technology

基　　金：江苏省博士后科研资助计划项目(1101017B);深部岩土力学与地下工程国家重点实验室博士后基金项目(PD1105);中国博士后科学基金项目(20110491475);中国矿业大学力建学院青年科技基金项目(lj2010qnjj03),中国矿业大学人才引进资助项目

摘　　要：为揭示降雨作用下浅埋隧道松散围岩塌方机制,基于突变理论,建立浅埋隧道塌方的尖点突变模型.考虑不同本构关系的隧道围岩组合,分别推导双层应变软化介质、单层应变硬化介质及应变软化介质组合的围岩失稳力学判据,分析诱发塌方的主要影响因素,揭示雨水入渗作用下浅埋隧道塌方机理.以马鞍山隧道为工程案例,运用地表沉降监测数据进行浅埋隧道塌方突变预测.研究表明,浅埋隧道塌方力学判据可有效用于塌方机制分析,用地表沉降数据预测浅埋隧道松散围岩塌方更为合理和符合实际.In order to reveal collapse mechanism in loose wall rock of shallow tunnel under rainfall,the cusp-catastrophic model is established based on catastrophe theory.Considering the case that surrounding rock of shallow tunnel is combined with different rock and soil mass,the instability criterions are derived when surrounding rock is combined with double strain-softening mediums or with single strain-hardening layer and strain-softening layer.The main influence factors and mechanism of collapse are analyzed.Then,the viewpoint is put forward that collapse of shallow tunnel can be predicted by data of ground settlement based on the catastrophe theory.It＇s feasibility and reasonability is tested by the collapse that occurs in construction of Maanshan tunnel.The results show that the derived instability criterions can analyze the collapse mechanism effectively.It is more feasible and tally with the actual that the data of ground settlement is used to predict the collapse in loose wall rock of shallow tunnel.

关 键 词：隧道工程 降雨 塌方 尖点突变模型 失稳判据 地表沉降 

分 类 号：U45[建筑科学—桥梁与隧道工程]