深部煤体采动应力场演化规律及扰动特征研究

doi:10.13722/j.cnki.jrme.2017.1138

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Abstract In order to describe the disturbance characteristics in the process of coal mining at depth，an expression of disturbance intensity based on mining stress is proposed. Mohr-Coulomb strain softening constitutive model is determined to describe the failure process of the coal and rock at depth. According to the actual conditions of coal mining，the numerical model under the conditions of mining protective layer and creep deformation at depth is built to analyze the evolution law of stress field and disturbance intensity of coal when the protective layer was extracted. Finally，the influence law of the disturbed stress field and creep deformation field is analyzed. The numerical results of vertical stress in coal are in good agreement with those of the in-situ test，which prove that the numerical simulation has certain rationality. The results show that：(1) the uniaxial compressive strength of coal and rock is significant difference. The stress attenuation rate of post peak is fast for high strength rock，while low strength coal shows the elastoplastic failure. (2) The disturbance factor based on the induced stress of coal mining is used to characterize the disturbance level of coal. The coal seam in the gob of the protective layer has extensive area of pressure relief range and shows the regional disturbance characteristics. The disturbance factor of local area without protective layer mining but affected by the roadways of the working is above 0.7，and shows high intensity disturbance characteristics. The mining stress disturbance factor has a positive correlation with the disturbance intensity，and the greater the disturbance factor，the stronger disturbance degree of the coal. (3) under the effect of disturbing and creep conditions，volume strain of coal under the gob of protective layer increases obviously，while undisturbed coal also increases over time due to the influence of creep deformation.

Key words： mining engineering coal at depth disturbance factor mining stress field volumetric strain

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	WANG Lujun1
	ZHOU Hongwei1
	2
	RONG Tenglong1
	REN Weiguang1

Cite this article:

WANG Lujun1,ZHOU Hongwei1,2, et al. Stress field evolution law and disturbance characteristic of coal at depth under mining [J]. , 2019, 38(S1): 2944-2954.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1138 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2944

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