小净距浅埋隧洞TRT6000+地质雷达超前地质预报  

TRT6000+Geological Radar Advanced Geological Prediction for Shallow Tunnels with Small Clearance

作　　者：张飞 ZHANG Fei(Survey and Design Institute of PowerChina Sinohydro Bureau 3 Co.,Ltd.,Xi'an713200,China)

机构地区：[1]中国水利水电第三工程局有限公司勘测设计研究院,西安713200

出　　处：《西北水电》2024年第4期116-121,共6页Northwest Hydropower

摘　　要：为解决小净距浅埋隧洞岩性硬度差、发育地下水、风化不均匀等复杂地质情况下开挖过程中出现的渗水、塌方等安全隐患问题,研究使用TRT6000加地质雷达设备在开挖前对掌子面前方工程地质和水文地质情况进行综合超前探测的应用效果,为小净距浅埋隧洞的安全顺利开挖提供可靠的预报探测方法。结果表明:根据TRT6000探测图像并结合现场地质情况和设计纵断面图推测前方存在稳定性较差的破碎带,部分区域存在点状至线状出水情况,在TRT6000探测的地质异常区段结合地质雷达设备进一步确定掌子面前方围岩完整性与富水情况,通过对比与实际开挖揭示的地质情况基本吻合,说明本方法可行;提出了以TRT6000长距离预报和地质雷达短距离预报两种物探预报方法为主的综合地质预报工作流程,从而准确探测小净距浅埋隧洞掌子面前方地质情况;通过准确探测掌子面前方断层、节理密集带、软弱夹层和地下水等情况,可有效降低开挖时地质灾害发生的几率和危害程度,为选取恰当的开挖技术、调整衬砌类型、改进安全措施以及精进项目设计提供依据,具有较好地应用前景。In order to solve the potential safety hazards such as water seepage and landslides that occur during the excavation of shallow tunnels with small clearance under complex geological conditions such as poor rock hardness,developed groundwater,and uneven weathering,the application effect of using TRT6000 plus geological radar equipment to conduct comprehensive advanced detection of engineering geology and hydrogeology in front of the work face before excavation is studied,providing a reliable prediction and detection method for the safe and smooth excavation of shallow tunnels with small clearance.The results show that based on the TRT6000 detection image combined with the on-site geological conditions and the designed longitudinal section,it is inferred that there is a broken zone with poor stability in front,and there are point-to-line water discharge in some areas.In the geological anomaly section detected by TRT6000,the geological radar equipment is applied to further determine the integrity and water-rich situation of the surrounding rock in front of the work face.The comparison result shows that the prediction is basically consistent with the geological conditions revealed by the actual excavation,indicating that this method is feasible;a comprehensive geological prediction workflow based on two geophysical prediction methods,TRT6000 long-distance prediction and geological radar short-distance prediction,is proposed to accurately detect the geological conditions in front of the work face of a shallow tunnel with a small clearance;by accurately detecting the faults,dense joint zones,weak interlayers and groundwater in front of the work face,the probability and degree of geological disasters during excavation can be effectively reduced,providing a basis for selecting appropriate excavation technology,adjusting lining types,improving safety measures and improving project design,with good application prospects and economic benefits.

关 键 词：TRT6000 地质雷达 破碎带 浅埋隧洞 

分 类 号：P631[天文地球—地质矿产勘探]