富水区岩溶隧道探测技术研究

Study on Detection Technology for Karst Tunnel in Water-rich Area

文章依托四川某富水区岩溶隧道工程,针对隧道过断层带可能会出现的岩溶坍塌、涌水和突泥等情况,针对性地提出了一套系统、高效的岩溶区和地下水的预报方法:以地质为核心,进行洞内外地质调查;对地下水采用瞬变电磁法探测;对岩溶采用地质雷达法探测;对岩溶、破碎带软弱夹层采用弹性波法进行初步判释;在出现不良地质体后采用可视化的超前水平钻和数字成像技术进行探测,做到了“地质为核心、多方法并举、长短结合、点面兼顾”的组合式预报,极大地提高了预报的准确率。

By using a karst tunnel project in water-rich area in Sichuan as the study object and with the aim to solve the problems in a tunnel crossing a fault zone such as karst collapse,water inflow and mud gushing,this paper renders a pertinent forecasting method:conduct geological survey inside and outside the tunnel to determine the geological conditions;detect groundwater by using the transient electromagnetic method;detect karst by using the ground penetrating radar method;conduct preliminary assessment of karst and weak intercalation in fracture zone by using the elastic wave method.When any adverse geological body is encountered,detect it by using visualized advance horizontal drill and digital imaging technology,to ensure comprehensive forecasting that combines“geological data,multiple methods,detection over long and short distances and forecasting at both spots and areas”and considerably enhance accuracy of forecasting.