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-Shan; ZHOU Zheng-Hua; SU Jie; WEI Xin

doi:10.11720/wtyht.2021.0020

2021 Vol. 45, No. 5

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Article navigation > Geophysical and Geochemical Exploration > 2021 > 45(5): 1288-1294

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XIAO Yan-Shan, ZHOU Zheng-Hua, SU Jie, WEI Xin. 2021. 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, 45(5): 1288-1294. doi: 10.11720/wtyht.2021.0020

Citation:

XIAO Yan-Shan, ZHOU Zheng-Hua, SU Jie, WEI Xin. 2021. 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, 45(5): 1288-1294. doi: 10.11720/wtyht.2021.0020

Discussion about the theoretical basis of the down-hole method for shear wave velocity test under surface forward and reverse horizontal hammer strikes

1. Collage of Transportation Engineering,Nanjing Tech University,Nanjing 210009,China;
2. First Affiliated Hospital,Heilongjiang University of Chinese Medicine,Harbin 150040,China

Received Date: 13 January 2021

Revised Date: 20 October 2021

Publish Date: 15 December 2021

Abstract

Abstract

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.
- down-hole method /
- numerical simulation /
- analytical solution /
- S-wave /
- P-wave

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References

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