Discussion about the theoretical basis of the down-hole method for shear wave velocity test under surface forward and reverse horizontal hammer strikes
XIAO Yan-Shan1(), ZHOU Zheng-Hua1(), SU Jie1, WEI Xin2
1. Collage of Transportation Engineering,Nanjing Tech University,Nanjing 210009,China 2. First Affiliated Hospital,Heilongjiang University of Chinese Medicine,Harbin 150040,China
The down-hole method under surface horizontal forward and reverse hammer excitation is frequently used for on-site tests of shear wave velocity.Based on the dynamic finite element method,this paper establishes a three-dimensional analysis model of the down-hole method used for shear wave velocity tests under the surface horizontal forward and reverse hammer excitation.Meanwhile,it determines the solutions of the wave response of linear elastic half space under the surface horizontal hammer excitation through explicit stepwise integration of time-domain lumped mass dynamic finite element.Furthermore,it analyzes the waveform characteristics of points at different depths and the rationality of the theoretical basis of shear wave (S-wave) velocity tests under the surface horizontal forward and reverse hammer excitation.As indicated by the results,the theoretical basis of S-wave velocity tests (i.e.,the non-inversion of P-wave onset but inversion of S-wave onset) using the down-hole method under surface horizontal forward and reverse hammer excitation is not tenable.In addition,the numerical simulation results have been further verified reasonable by the analytical solution of the wave motion in the linear elastic half space under the surface horizontal forward and reverse excitation.
肖妍姗, 周正华, 苏杰, 魏鑫. 地表水平正反敲击激振下孔法剪切波速测试理论依据讨论[J]. 物探与化探, 2021, 45(5): 1288-1294.
XIAO Yan-Shan, ZHOU Zheng-Hua, SU Jie, WEI Xin. Discussion about the theoretical basis of the down-hole method for shear wave velocity test under surface forward and reverse horizontal hammer strikes. Geophysical and Geochemical Exploration, 2021, 45(5): 1288-1294.
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