各向异性岩体弹性矩阵系数反演分析与应用

doi:10.13722/j.cnki.jrme.2021.0570

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Abstract There are seldom inverse researches of 21 elastic matrix coefficients of anisotropic rock mass at home and abroad. In this paper，the Walkaway VSP observation system for fine exploration of mine rock mass is designed by using the rock mass in-situ testing technology of “three-dimensional three component data acquisition of VSP excited by shear wave vibrator”. By using the formulas for calculating the slowness and polarization vectors of qP and qS waves based on the solution of Christoffel equation in anisotropic media，and taking the wave field parameters(slowness and polarization vectors) of qP and qS waves collected in situ as input conditions，the 21 coefficients of the elastic matrix of rock mass under the condition of complete anisotropy are obtained based on the combination of vertical and horizontal waves. Using the elastic matrix coefficients，the “three zones” anisotropy of the overlying rock is identified as HTI medium attribute，and the anisotropy parameters and engineering mechanical parameters of rock masses at different depths are calculated. The relationships between the “three zones” of overburden with the anisotropy parameters and the engineering mechanical parameters are analyzed. The results of this study make the forward calculation of rock mechanics and exploration seismology no longer depend on the assumption of the type of anisotropy of the target medium，and open up a new direction for the study of rock engineering mechanical properties.

Key words： rock mechanics anisotropism elastic matrix coefficient inversion analysis

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LIU Xiaoping1,2,3. Inversion technique and engineering application of elastic matrix coefficients for anisotropic rock mass[J]. , 2021, 40(9): 1826-1838.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0570 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I9/1826

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