冲击地压物理相似模拟中煤的冲击倾向性影响规律研究

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Abstract Physical similarity simulation is one of the important methods for studying coal/rock burst problems，and the rational selection of similar materials is a crucial prerequisite to ensure the effective simulation of mining disturbance response of roadway or longwall working face. Therefore，through the comprehensive study of similarity theory and numerical simulation methods，the fracturing characteristics as well as the effect of geometric similarity ratio of different bursting-prone prototype coals and similar coal materials in physical similarity simulation of coal/rock burst were investigated. The similarity conditions for basic parameters，damping，energy and bursting liability indexes were obtained，and the geometric similarity ratio correlation of coal/rock burst failure characteristics of coal samples and coal roadway models with different coal bursting liabilities was studied using the continuous-discontinuous simulation method. The results show that the coal samples with strong bursting liability exhibit elasto-brittle dynamic failure，while those without bursting liability represent static rupture in forms of post-peak strain-softening. For the coal sample similarity model with geometric similarity ratios of 2，5，10 and 20，the simulated values of uniaxial compressive strength are basically consistent with the theoretical values. The bursting energy index decreases first and then stabilizes with the increase of geometric similarity ratio，and the fragmentation degree and debris kinetic energy of coal samples decrease with the increase of geometric similarity ratio. The excavation of prototype coal roadways with strong bursting liability reveals a dynamic failure process，and the kinetic energy of the coal ribs decreases gradually with increasing geometric similarity ratio，and the roadway eventually transforms from dynamic failure into static failure. Finally，the reasons for the correlation of geometric similarity ratio in the dynamic failure behavior of the physical similarity simulation are discussed，and some suggestions are given for the selection of materials for the physical similarity simulation of coal/rock burst and the simulation conditions of burst phenomena. This study provides guidance for the physical similarity simulation of coal/rock burst.

Key words： mining engineering coal/rock burst physical similarity simulation bursting liability geometric similarity ratio bursting manifestation

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	Articles by authors
	JU Minghe1
	2
	YAO Baoshan2
	DOU Linming3
	CAI Wu4
	CAO Anye3
	KAN Zihao3

Cite this article:

JU Minghe1,2,YAO Baoshan2, et al. Influence of coal bursting liability on physical similarity simulation of br coal/rock burst[J]. , 2024, 43(12): 2940-2955.

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https://rockmech.whrsm.ac.cn/EN/Y2024/V43/I12/2940

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