TST技术在贵州高速公路顶效隧道超前地质预报中的应用

Application of TST approach to the advanced geological prediction for Dingxiao tunnel in Guizhou highway

顶效隧道位于汕头至昆明国家高速公路中段贵州境内,岩溶发育,地质构造复杂,岩体破碎。为了确保施工安全,减少和避免地质灾害发生,采用了TST技术对隧道进行超前预报。结果表明,TST技术采用空间观测系统和最大能量扫描技术有效地提高了速度分析精度和构造定位精度,应用二维方向滤波技术有效地消除了侧向回波和面波,成功地解决了断层、破碎带及含水带的地质超前预报问题。

Dingxiao tunnel is located at the middle of Shantou-Kunming expressway in Guizhou province,where the karst is well developed,the geological structure is complex,and the rock is very fragmented.In order to insure the construction safety,to avoid or decrease the geological hazard in the construction,the advanced prediction approach with TST is applied.The results show that the TST could successfully predict the faults,the fractured zone and the water-bearing zone based on the spatial observation and the F-K filtering technique.The spatial observation of TST could effectively improve the precision of the velocity analysis and the structure location,and the F-K filtering of TST could effectively filter the surface wave and the sidewise echo wave.