复杂预应力路径和异源动力扰动下岩石破裂机制研究

doi:10.13722/j.cnki.jrme.2015.0982

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Abstract The force form of the surrounding rocks in underground engineering is coupled static-dynamic loads after true triaxial unloading-loading. The mechanical properties of the surrounding rock under frequent disturbance are easy to be degraded，which can induce engineering disasters such as rock burst and so on. Based on the complex stress environment of surrounding rocks，rock failure tests under the complex true triaxial pre-stressed path and local dynamic disturbance were carried out. The test results show that rock failure occurred when the amplitude of the local dynamic load was in a relatively large level，and the failure mode is splitting tensile failure. PFC3D was used to reappear the lab experiment and study the microscopic characteristics of rock failure under dynamic disturbance. When the amplitude of the local dynamic load was less than 250 kN，both shear cracks and tensile cracks were triggered and their number keep stable. When the amplitude of the local dynamic load was 300 kN，the shear cracks and the tensile cracks spread from the perturbation load position to the entire specimen. The number of tensile cracks exceeded the number of shear cracks while the rock got final failure. The results of lab test and simulation are consistent.

Key words： rock mechanics true triaxial unloading dynamic load failure mechanism

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	Articles by authors
	DU Kun1
	2
	3
	LI Xibing2
	DONG Longjun2
	TAO Ming2
	ZHOU Jian2

Cite this article:

DU Kun1,2,3, et al. FRACTURE MECHANISM OF ROCK INDUCED BY TRUE-TRIAXIAL UNLOADING AND HETEROLOGY DYNAMIC DISTURBANCE[J]. , 2015, 34(S2): 4047-4053.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2015.0982 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/IS2/4047

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