采动覆岩渐进破坏的连续–离散耦合模拟研究

doi:10.13722/j.cnki.jrme.2022.0098

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Abstract The key to the accuracy of the numerical results of the fracture evolution of mining overburden is to establish the mechanical constitutive model and numerical method reflecting the continuous-discrete medium transformation of mining rock. The yield function and plastic potential function with deviatoric stress and spherical stress as basic variables were constructed，and the elastic-plastic constitutive model of complete rock block was obtained by combining with generalized Hooke?s law. By introducing the elastic-plastic damage theory，taking the square tensile-shear stress criterion as the initial damage criterion and combined with the Benzeggagh-Kenane fracture criterion，the constitutive model of tensile-shear mixed mode fracture was obtained. The discrete block compression constitutive model was constructed，and the Sargin?s shear friction constitutive model of rough discontinuities was modified based on the direct shear experimental data. Therefore，a continuous-discrete coupling simulation program reflecting the progressive failure of rock was compiled. On the basis of verifying the constitutive model，the numerical calculation model was established according to the engineering geological conditions of the DaTong mine. The results show that：(1) The progressive failure constitutive model of rock and the corresponding continuous-discrete coupling simulation method can numerically realize the transformation process of rock from continuum to discrete body. (2) Under the disturbance of repeated mining in multiple coal seams，the distribution of overburden fractures in Carboniferous coal seams is complex，and its height is about 21 times of the mining height，far exceeding the results obtained by empirical formula. (3) Under the coupling action of concentrated stress and mining stress of Jurassic coal pillar，the peak value of advanced support pressure of Carboniferous mining face reaches 42 MPa，which is about 8–10 MPa higher than that in the area without coal pillar，and the ground pressure shows strongly. The above results have been preliminarily applied in Datong mining area，which provides theoretical support for further water retaining mining，fracturing and pressure relief.

Key words： rock mechanics strata movement progressive failure continuous-discrete medium mixed mode fracture compression-shear friction

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	LI Hao1
	TANG Shibin2
	3
	MA Liqiang4
	BAI Haibo5
	KANG Zhiqin1
	WU Pengfei1
	MIAO Xiaocheng6

Cite this article:

LI Hao1,TANG Shibin2,3, et al. Continuous-discrete coupling simulation of progressive failure of mining overburden rock [J]. , 2022, 41(11): 2299-2310.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0098 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I11/2299

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