A Study on the Mechanical Properties and Acoustic Response Characteristics of Marble in the Process of Triaxial Mechanical Loading

doi:10.11885/j.issn.16745086.2021.04.29.04

Abstract

Abstract: The mechanical environment of deep stratum rocks is extremely complex. The study of rock mechanical properties, failure laws and acoustic response characteristics under high stress can provide a basis for the scientific design of key parameters of deep wells. This paper carried out triaxial mechanical experiments on marble under different confining pressure conditions, analyzed the stress-strain and acoustic characteristics of marble during loading under different confining pressure conditions, and discussed the applicability of strength criteria and rock stress-strain and dynamics, acoustic response mechanism. Research shows that during the mechanical loading process, the wave velocity of the rock sample can be divided into two types: “rapid increase-uniform increase-step down” and “rapid increase-uniform increase-maintain stability-step down”; before the rock sample is damaged, the wave speed of the rock sample and amplitude of the rock sample decrease in different degrees; with the increase of confining pressure, the compressive strength and elastic modulus of marble increase, and the failure mode of the rock sample changes from splitting to shearing. Confining pressure has an inhibitory effect on the occurrence of secondary cracks in marble; the linear Morh-Coulomb criterion and the single parameter Bieniawski criterion are applicable to the description of the strength characteristics of marble under low and high confining pressures, respectively. The research in this paper provides an important theoretical basis for the prediction of rock fracture in deep wells and the establishment of strength criteria.

Key words: deep marble, mechanical parameters, strength criterion, speed of sound wave, amplitude of sound wave

CLC Number:

TE22

MENG Yingfeng, YANG Fengqiang, LI Cheng, YIN Hanxiang, LIU Houbin. A Study on the Mechanical Properties and Acoustic Response Characteristics of Marble in the Process of Triaxial Mechanical Loading[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 1-10.

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