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Defect Detection for the Overlying Strata of a Metro Tunnel Based on the Rayleigh Wave Method
(1 China Railway Southwest Research Institute Co. Ltd., Chengdu 611731; 2 The Fifth Engineering Company of the CCCC Second Harbour Engineering Co., Ltd , Wu Han 644606)
Abstract To detect the overlying strata defects for an urban metro tunnel during construction, the Rayleigh wave method was adopted, in which the signal-noise ratio can be increased by avoiding the peak environmental noise hour and improving the coupling between the detector and the hardened ground surface. Furthermore, the detection data were calculated by the simulated annealing inversion method, which has the advantages of reducing the impacts from the initial model and avoiding the local optimization solution. Engineering practices show that the results of the Rayleigh wave method agree well with those of the low-frequency GPR method/core-drilling method/site construction log in terms of abnormal location.
Abstract：
To detect the overlying strata defects for an urban metro tunnel during construction, the Rayleigh wave method was adopted, in which the signal-noise ratio can be increased by avoiding the peak environmental noise hour and improving the coupling between the detector and the hardened ground surface. Furthermore, the detection data were calculated by the simulated annealing inversion method, which has the advantages of reducing the impacts from the initial model and avoiding the local optimization solution. Engineering practices show that the results of the Rayleigh wave method agree well with those of the low-frequency GPR method/core-drilling method/site construction log in terms of abnormal location.
LU Song- 1 Sun-Xiao-Qiang- 2 Hua-Xiao-Ming- 1
.Defect Detection for the Overlying Strata of a Metro Tunnel Based on the Rayleigh Wave Method[J] MODERN TUNNELLING TECHNOLOGY, 2016,V53(4): 179-184
2016, Vol. 53 