岩溶隧道突涌水机制及安全临界条件研究  

Study on Water Inrush Mechanism and Safety Critical Conditions of Karst Tunnels

作　　者：马国民 张秀丽[2] 杨华清 MA Guomin;ZHANG Xiuli;YANG Huaqing(Yunnan Chuxiong-Dali Expressway Investment and Development Co.,Ltd.,Dali 671000,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]云南楚大高速公路投资开发有限公司,云南大理671000 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《安全与环境工程》2022年第2期64-70,共7页Safety and Environmental Engineering

基　　金：云南省交通运输厅科技创新及示范项目(云交科教[2018]18号);国家自然科学基金面上项目(41772328)。

摘　　要：我国西南山区灰岩分布广泛、岩溶十分发育,隧道建设中经常遭遇突涌水事故。以楚大高速公路九顶山岩溶隧道为例,针对该岩溶隧道发生突涌水的断面(左幅ZK281+940),基于综合物探推测出的涌水体空间位置及规模形态,建立了概化计算模型,并采用非连续变形分析(DDA)方法对高压岩溶水作用下隧道顶板破坏、发生突涌水事故的过程进行了数值模拟,分析了隧道围岩破坏机制和突涌水事故发生的条件,以及不同溶腔水头作用下隧道围岩的变形演化规律,得出导致隧道突涌水发生的安全临界水头,并与现场监测结果进行了对比验证。结果表明:溶腔水头与隧道突涌水事故的发生高度相关,当溶腔水头超过安全临界水头时,该岩溶隧道将会发生突涌水事故,数值模拟结果与现场监测结果基本一致。该研究结果可为类似地质条件隧道突涌水防治提供参考。Limestone is widely distributed and karst is well developed in the mountainous areas of southwestern China,and water inrush accidents are often encountered during tunnel construction.Taking Jiudingshan Tunnel of Chuxiong-Dali expressway as an example,aiming at the section where water inrush occurs(left panel ZK281+940),on the basis of the spatial location and scale of water body inferred by the comprehensive geophysical prospecting,we establish a generalized calculation model and use the Discontinuous Deformation Analysis(DDA)method to simulate the process of tunnel roof failure and water inrush under the action of high-pressure cavity water,and analyze the surrounding rock failure mechanism and water inrush conditions.In addition,we analyze the evolution law of surrounding rock deformation under different water heads,and obtain the critical water head value that will cause the water inrush.We compare the research results with the on-site monitoring results.The results show that the cavity water head and the water inrush accidents are highly correlated.When the cavity water head exceeds the critical value,a water inrush accident occurs.The numerical simulation results are basically consistent with the on-site monitoring results.This research can provide reference for the prevention of water inrush in tunnels with similar geological conditions.

关 键 词：岩溶隧道 突涌水 安全临界水头 非连续变形分析(DDA) 

分 类 号：X948[环境科学与工程—安全科学]