Author: ZHENG Jidong, CHEN Shuilong, LI Dongyan,ZHUO Yue, CHONG Kailin, WANG Hua | Time: 2019-04-19 | Counts: |
Abstract:Gaoligongshan tunnel of Da-Rui railway faces with complicated geological conditions and large water discharge during the construction. In order to prevent sudden geological accidents of water hazards, the waterenriched section and joint-fissure-developed section in surrounding rock in the front of the working-face were detected based on the TSP seismic detection system. The response of seismic information to the stability of surrounding rock was studied, and the geological anomaly evaluation index system was established based on information extraction. Meanwhile, cluster analysis method was used to analysis the seismic wave spatial distributions, the physical mechanics parameter of surrounding rock as well as the correlations between rich water area and joint fissure. The water rich and stability of surrounding rock was classified. The results of the classifications were used in prediction of geologic anomaly in 120 m range of PDZK225 + 999 face. The prediction results showed that the surrounding rock enriched in water in around 50 m of the front face in surrounding rock type as W2 and S3. The joint fissures of surrounding rock in the front 50 ~ 90 m of the face were abnormally developed but the water enrich was not strong, the surrounding rocks were W3 and S3, W4 and S2, W4 and S4. The advanced horizontal drilling and actual practice proved that the grading method was feasible and the results matched well with actual features, and the prediction results were accurate and reliable. By this method, the reliability of the seismic detection results was highly improved.