中低应变率扰动荷载作用下砂岩动态拉伸力学响应特征研究

doi:10.13722/j.cnki.jrme.2021.0691

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Abstract The tensile failure and instability induced by medium and low strain rate disturbance load is one of the main causes of dynamic disasters in deep coal resources and residual coal resources mining. And it is of great significance to analyze the tensile mechanical response characteristics of coal and rock under dynamic disturbance for disaster prediction and prevention. In this regard，Brazilian splitting test of sandstone under medium low strain rate disturbance load was carried out .To analyze the influence of different pre-static load levels and disturbance load amplitude on dynamic tensile mechanical response characteristics of sandstone. The results show that：The degree of damage due to disturbed loading was positively correlated with the pre-static load level, and the AE energy level increased by about 11 times when the pre-static load increased from 7 kN to 20 kN. Macroscopically, this is manifested as a reduction in tensile strength. The tensile strength of disturbed sandstone with pre-static load of 11 kN and 16 kN is 12.4 MPa and 11.5 MPa，respectively，which is 5.6% and 12.7% lower than that of static tensile strength. The existence of stress threshold value of disturbance load is verified. The sandstone in high stress state will not be destroyed in the process of small amplitude dynamic disturbance load，and the tensile strain increases logarithmically. The sandstones in high stress state are destroyed during the application of disturbing loads greater than the stress threshold. And the number of cycles of perturbation loading before damage decreases exponentially with increasing amplitude. The increase of pre-static load level and dynamic load amplitude both promotes the expansion of secondary tension cracks in the vicinity of the central tensile crack in the rock sample. The precursor of strain surge before dynamic tensile failure of rock specimen can provide reference for dynamic disaster warning.

Key words： rock mechanics dynamic and static load coupling action dynamic response Brazilian splitting test sandstone destruction properties

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	Articles by authors
	WEN Xiaoze1
	2
	FENG Gourui1
	2
	GUO Jun1
	2
	3
	WANG Pengfei1
	2
	QIAN Ruipeng1
	2
	ZHU Linjun1
	2
	HAO Chenliang1
	2
	FAN Yijiang1
	2

Cite this article:

WEN Xiaoze1,2,FENG Gourui1, et al. Dynamic tensile mechanical response properties of sandstone under medium and low strain rate disturbance load[J]. , 2022, 41(S1): 2812-2822.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0691 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/2812

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