基于地质雷达实测的岩溶隧道破碎段塌方量估算方法  

Study on Estimation Method for Collapse Amount of Broken Section of Karst Tunnel Based on Ground Penetrating Radar Spot Detection

作　　者：吴霞[1] WU Xia(School of Architecture Engineering,Jiangxi College of Applied Technology,341000,Ganzhou,Jiangxi,China)

机构地区：[1]江西应用技术职业学院建筑工程学院

出　　处：《河北水利电力学院学报》2019年第4期24-31,共8页Journal of Hebei University Of Water Resources And Electric Engineering

基　　金：江西省教育厅科学技术研究项目资助课题（GJJ170564）;广西壮族自治区科技攻关项目资助课题（桂科攻10124006-10）;国家自然科学基金项目资助课题（41272285)

摘　　要：岩溶隧道破碎段围岩自稳性差,在施工中易产生塌方,为更好地对潜在的塌方量进行估算,依据地质雷达的探测优势,考虑一种基于地质雷达现场实测的破碎段塌方量估算方法。文中介绍了地质雷达探测和塌方量估算的基本原理,并基于围岩松动圈厚度探测推导了塌方量的估算公式;以广西壮族自治区六寨—宜州高速公路天生桥隧道为依托,采用该公式对塌方量进行了估算和对比分析,并以富水性为依据给出了修正系数,经修正后的塌方量估算值与实际值的最大差值小于10 m 3,表明该估算公式可行、实用。The surrounding rock of the broken section of karst tunnel is prone to collapse during the construction due to its poor self-stability. On the basis of the detection advantages of GPR (Ground Penetrating Radar), an estimation method of collapse amount of the broken section was taken into account based on the GPR spot detection to estimate the potential collapse amount more precisely. The general principle of detection and collapse amount estimation was analyzed and the basic scheme of collapse amount estimation was introduced. Besides, the estimation formula of collapsed amount was deduced according to the thickness detection of broken rock zone. On the basis of Tianshengqiao Tunnel of Liuzhai to Yizhou Expressway in Guangxi Autonomous Region, the deduced formula was applied to estimate the collapse amount of broken sections, and on the basis of the comparison between the real and estimation amount, the formula was amended according to the watery of the broken section of the tunnel. The maximum difference between the amended estimation amount and the real amount is lower than 10m3,which shows the effectiveness and practicability of the estimation formula.

关 键 词：岩溶隧道 破碎段 塌方量 估算方法 地质雷达 

分 类 号：U458.3[建筑科学—桥梁与隧道工程]