Study on Application Effect of Advanced Geological Prediction in a Shallow-Buried Soft Surrounding Rock Tunnel
Geological forecasting is a necessary link and important means to ensure the safe and efficient construc-tion of tunnel.Shallow-buried soft surrounding rock tunnels have developed joints and fractures,poor rock integ-rity,and low self-stability of the surrounding rock,making tunnel construction prone to collapse and other risks.I-dentifying the geological conditions ahead of the tunnel face in shallow-buried soft surrounding rock tunnels is of great significance for their construction.Based on geological radar and seismic reflection method,this paper con-ducts forward geological prediction analysis on the left and right lines of a shallow-buried soft surrounding rock tunnel project.The prediction results are verified by actual excavation conditions.The results show that geological radar and HSP seismic method can effectively predict the integrity of rock and the unfavorable geology of shal-low-buried soft surrounding rock tunnels.They have accurately predicted soft and broken zones,as well as long-developed structural surfaces several times.The rock type of the right line from(K7+140)～(K7+220)and the left line from(ZK7+014)～(ZK7+094)is mudstone,with developed joints and fractures,and the rock is relatively broken or broken.Among them,the(K7+182)～(K7+192)and(ZK7+061)～(ZK7+067)sections have long-developed structural surfaces.The prediction results are close to the actual geology of the excavation.
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