ABSTRACT
Fusion of geophysical methods in geotechnical engineering applications can offer complementary information on the mechanical properties of the ground. In this paper, geophysical method involving seismic waves is adopted in a tunnel look-ahead technology. Tunnelling in complex geology and congested underground spaces in urban settings pose challenges for tunnel boring machines (TBMs) to operate efficiently and safely. Without the need for cutterhead access or through-lining drilling, geophysical seismic wave methods can travel and propagate through the ground to detect anomalies ahead of the TBM face. Case studies are presented to validate the robustness of look-ahead estimates of subterranean obstacles and rock-soil interface well ahead of the tunnelling.
