红砂岩三轴加载过程中波速变化及能量演化规律试验研究

doi:10.13722/j.cnki.jrme.2020.1145

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Abstract In order to study the change of the wave velocity and the law of energy evolution of red sandstone under triaxial loading，compression and shear wave velocity tests of red sandstone in the full stress-strain process under different confining pressures were carried out by using the Rock Top multi-field coupling tester and the JSR-DP300 ultrasonic testing system. The results show that the compression and shear wave velocities increase as a power function of the confining pressure，accompanied by increasingly nonlinear characteristics，and that the wave velocity data points are distributed in a long and narrow interval. The confining pressure only has a gain effect on the macroscopic strength of rock，and the microscopic difference is still very obvious. In the process of triaxial compression，the compressional wave velocity can be divided into three stages including continuous growth，oscillation and rapid attenuation. Under the condition of high confining pressures，the phase characteristics of the shear wave velocity are not obvious，and the curve of the shear wave velocity is nearly linear and relatively smooth. The greater the confining pressure is，the weaker the gain of the wave velocity is in the axial loading process. The attenuations of the compression and shear wave velocities are synchronous，and the compression wave velocity is more sensitive to the state of stress difference. Under different confining pressures，the overall shapes of the energy density curves are consistent，and the attenuation interval of the wave velocity corresponds to the main growth interval of the dissipated energy. Before the rock damage stress，there is a good linear correlation between the compression and shear wave velocities，and the inflection point of the compression and shear wave velocities can be used as a mark to judge the damage stress. With increasing the axial strain，the dynamic elastic modulus under different confining pressures generally increases at first，then keeps relatively stable，and finally rapidly decreases. The dynamic Poisson's ratio shows an overall growth trend. After entering the IV stage，the curve fluctuates violently and the dynamic Poisson¢s ratio increases rapidly. The stage characteristics of the two curves are not obvious.

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	ZHANG Peisen1
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	ZHAO Chengye1
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	LI Tenghui1
	2
	HOU Jiqun1
	2
	ZHANG Rui1
	2

Cite this article:

ZHANG Peisen1,2,ZHAO Chengye1, et al. Experimental study on wave velocity variation and energy evolution of red sandstone during triaxial loading process[J]. , 2021, 40(7): 1369-1382.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1145 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/I7/1369

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