Comprehensive technique of geological prediction and its applications in tunnel excavation

摘要

Aiming at the existing problems of current single predication technique, the method of comprehensive application technique which combines engineering geophysical exploration with engineering geology is pVesented in this study. The technique of geological prediction which could predict the geological conditions ahead of the face and improve construction progress is adopted widely during tunnel excavation. The method could make excavation more economical and secure by the way of improving the accuracy of predication. It employs engineering geophysical exploration measures like Tunnel Seismic Prediction (TSP) to detect the geological conditions ahead of the face, and take the measure of investigating and deducing to acquire precise results either in the tunnel or on the surface. Compared with single technique, it has the advantages of high resolution, speed, ease-of-use, low cost, etc. Based on comparing various techniques applications and analyzing successful example of Dashuijing tunnel of Shanghai-Chendu west expressway in China, which combine technique TSP 203 with the measures of survey and deduction in engineering geology. The results expound the particular advantages of comprehensive method and its favorable prospect, as well as provides a new idea for the techniques development of tunnel geological prediction.