岩溶地区隧道围岩临界防突厚度数值分析  

Numerical analysis of thickness of critical outburst prevention layer of peripheral rock in karst tunnel

作　　者：周小龙 李澳 冯雪冬 ZHOU Xiaolong;LI Ao;FENG Xuedong(School of Civil Engineering and Architecture,Wuhan Institute of Technology,Wuhan 430074,China)

机构地区：[1]武汉工程大学土木工程与建筑学院,湖北武汉430074

出　　处：《武汉工程大学学报》2024年第4期452-459,共8页Journal of Wuhan Institute of Technology

基　　金：武汉工程大学第十四届研究生教育创新基金(CX2022205)。

摘　　要：依托某隧道工程,基于岩溶地区地质特征建立了岩溶隧道围岩结构概化数值模型,分析充水溶洞位于隧道不同位置、各工况下岩溶隧道防突层破坏过程及规律,提出了不同位置下围岩临界防突层厚度。研究结果表明:岩溶的发育规模、岩层厚度、溶洞位置和岩溶水压均为突水灾害发生的主要影响因素;溶洞位于拱腰时,塑性区最大变形发生在岩溶隧道防突岩层中心,从位移、应力和孔隙水压变化规律可知,溶洞位于隧道拱腰时,对隧道围岩稳定性影响较大;由数值模拟结果可知,各工况下未发生塑性贯通区的位置及临界防突层厚度。研究成果可为岩溶区隧道建设及工程施工中的突涌突水灾害预测提供科学依据。Using a tunnel project,based on the geological characteristics of karst areas,we established a generalized numerical model of the surrounding rock structure of the karst tunnel.Analyzing the failure process and law of the outburst prevention layer of the karst tunnel under different positions and working conditions of the water-filled karst cave,we proposed the thickness of the critical outburst prevention layer of peripheral rock at different positions.The results show that the karst development scale,rock thickness,karst cave location,and karst water pressure are the main factors resulting in water inrush disasters.When the karst cave is located at the arch waist,the maximum deformation of the plastic zone occurs in the center of the outburst prevention rock layer of the karst tunnel.From the variation law of displacement,stress,and pore water pressure,it can be seen that the karst cave has a greater influence on the stability of the surrounding rock of the tunnel when it is located at the arch waist of the tunnel.The numerical simulation results show the locations of the plastic penetration zones and thickness of the critical outburst prevention layers under various working conditions.The research results above provide a scientific basis for prediction of water inrush disasters in tunnels and other engineering construction in karst areas.

关 键 词：岩溶隧道 隧道突水 临界防突层厚度 数值模拟 

分 类 号：TD823[矿业工程—煤矿开采]