Abstract:

During the process of shield tunneling in cities, especially in weathered granite residue (boulder) containing strata, incidents, such as shield attitude deviation, serious wear of cutter tools, deformation of cutterhead and cutter, water burst, collapse and shield jamming, will inevitably happen. As a result, geophysical prospecting technology becomes more and more importantant to guarantee the success of tunneling. In this paper, the seismic CT method is studied based on the combination results of numerical simulation and site test. The core drilling results coincide with the actual geological conditions,and the accuracy of the detection technology is guaranteed. The suggestions proposed in this paper can provide reference for geophysical prospecting of underground works in the future.

Key words: shield tunnel, spherical weathered granite residue, geophysical prospecting, crosshole seismic CT method, numerical simulation