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

doi:10.11720/wtyht.2021.0020

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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.

Key words： down-hole method numerical simulation analytical solution S-wave P-wave

Received: 13 January 2021 Published: 15 December 2021

ZTFLH:

P631

Corresponding Authors: ZHOU Zheng-Hua E-mail: 954231383@qq.com;bjsmoc@163.com

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	Yan-Shan XIAO
	Zheng-Hua ZHOU
	Jie SU
	Xin WEI

Cite this article:

Yan-Shan XIAO,Zheng-Hua ZHOU,Jie SU, et al. Discussion about the theoretical basis of the down-hole method for shear wave velocity test under surface forward and reverse horizontal hammer strikes[J]. Geophysical and Geochemical Exploration, 2021, 45(5): 1288-1294.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.0020 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I5/1288

Surface level positive and negative percussion hole method S-wave velocity test
a—schematic of downhole seismic method with surface plank source;b—signal traces recorded at different testing depth by downhole seismic method at a site in Beijing;c—3D numerical analysis model of downhole seismic method

Mechanical parameters of the model

3D analysis model(a) and load(b) of S-wave velocity test by hole method under surface horizontal excitation

Signal traces at different depth observation points in x-direction under the horizontal forward and backward excitation
a、b、c—the original signal traces at different selected depth;d、e、f—amplified waveform of partially signals at observation points with depth of 8 m,16 m,24 m

Displacements of directly below surface tangential point source with approximate Heaviside unit function
a—approximate Heaviside unit function;b—displacements at depth of 2 m and 8 m in an elastic half-space directly below surface tangential point source with the poisson's ratio of 0.25

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