Application of TETSP in tunnel advance geological prediction
This paper introduces a tunnel long-distance prediction seismic reflection imaging system,TETSP,which is used for advanced geological prediction of a water distribution project tunnel with TSP303.The layout and data processing process of the TETSP observation system are introduced,and the differences between TETSP and TSP303 in terms of detector coupling and acoustic interference suppression are explained.The characteristics of the original signals are compared,and the reflection anomaly law corresponding to the strong dissolution zone of the rock mass is analyzed;the actual excavation results of the tunnel have verified the reliability of TSP303 and TETSP predictions.The results show that both seismic reflection tech-niques can effectively detect interfaces with significant differences in wave impedance of the rock mass in front of the palm.Sec-ondly,areas with concentrated reflection interfaces in offset profiles and low longitudinal and transverse wave velocities corre-spond to poor rock mass quality.Thirdly,TETSP detector sensitivity and data noise ratio TSP303 is higher,but TSP303 data processing software is relatively more mature and,therefore has higher prediction accuracy.
TETSPTSP303thousand island lake-Hangzhou water transfer projectadvance geological prediction
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