岩溶隧道施工过程中大型溶洞的综合预报及治理方案研究  

Comprehensive Geological Prediction and a Relevant Treatment Scheme for a Large Karst Cave in Tunnel Construction

作　　者：袁永才[1] 李术才[1] 李利平[1] 石少帅[1] 周宗青[1] 雷霆[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,济南250061

出　　处：《现代隧道技术》2015年第2期192-197,共6页Modern Tunnelling Technology

基　　金：国家重点基础研究发展计划(973)项目(2013CB036000)

摘　　要：根据尚家湾隧道隧址区地表水文点观察情况,并结合地形地貌特征、岩性和构造条件,判断尚家湾隧道在施工过程中可能揭露大型溶洞,出现突水突泥等工程灾害。文章针对前期隧道施工风险评价结果,采用综合地质预报方法对隧道前方不良地质体进行探测:采用TSP(隧道地震预测)法对ZK67+835处溶洞位置进行了准确预报;采用地质雷达法准确预报了YK67+805处的溶洞;采用超前钻探探明了溶洞在隧道底板下方的具体位置、走向及规模。探测结果表明,左右线隧道溶洞相互连通,为特大下伏无充填型溶洞。针对揭露的溶洞特点,分别采取填堵法和跨越法进行治理。左线在雨季期间无水流通过,采取填堵法;右线采取跨越法,梁板分离,分别承担隧道结构荷载和路面车辆荷载。通过对治理后围岩的变形监测,验证了治理方案的有效性,为后期类似溶洞治理提供了借鉴。Based on the hydrological conditions of features of the Shangjiawan tunnel, it was determined tion, which could result in geological hazards such as the observation points, topography, lithology and structural that large karst caves may be encountered during construc- water inflow and mud bursts. Based on an early risk assess- ment, a comprehensive geological prediction method is adopted in this paper to explore the unfavorable geologic bodies in front of the tunnel, utilizing the seismic prediction （TSP） method for the karst cave at ZK67＋835, the ground penetrating radar （GPR） method for the cave at YK67＋805 and advance strike and dimensions of the cave under the tunnel floor. The results show that right tunnel tubes are interconnected with each other, forming an the characteristics of the disclosed caves, such measures as filling drilling for the specific location, karst caves in the left and extra-large underlying unfilled cave. Aimed at and bridging are used for this project; backfill- ing is appropriate for the left tunnel tube, which has no water passing through during the rainy season, and bridg- ing is appropriate for the right tunnel tube, with the structural load borne by a simple beam and the vehicle load by a cover plate. This treatment scheme is verified by rock deformation monitoring after treatment.

关 键 词：岩溶隧道 大型溶洞 地质预报 溶洞治理 

分 类 号：U453.61[建筑科学—桥梁与隧道工程]