爆炸与冲击中的非线性岩石力学问题(II)：冲击扰动诱发岩块滑移的物理模拟试验

doi:10.13722/j.cnki.jrme.2017.0684

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Abstract Rock masses can be regarded as the hierarchical structure of masses composed of blocks with structural planes and have the capability of storing energy at micro-level. Propagation of stress waves in rock masses generated by the external disturbances may trigger the release of internal energy and result in geologic hazards such as very large irreversible deformation，rockburst，engineering earthquake and so on. With the dynamic testing system of rock blocks developed in-house，the physical experiments to simulate the slipping of rock blocks induced by the impact disturbances were carried out to study the mechanism of irreversible displacements and slip failure，the influence factors and the conditions of threshold energy. Experimental results show that when the initial shear force is close to zero，the irreversible displacement may be induced by the external disturbances. The threshold energy of the irreversible displacement decreases with the increase of the initial shear force. When the initial shear force is close to the dynamic shear strength，the external disturbances may trigger slip failure. A dimensionless characteristic energy factor was used to characterize the threshold energy conditions of the irreversible displacement and slip failures induced by external disturbances. The physical relationship between the characteristic energy factor and the dimensionless energy conditions for pendulum-type waves was discussed. The comparison with experimental results shows that the energy factor can characterize the threshold energy conditions of irreversible displacements and slip failures induced by the external disturbances very well.

Key words： rock mechanics block rock mass external disturbance slip instability irreversible displacement

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	Articles by authors
	LI Jie1
	2
	JIANG Haiming1
	WANG Mingyang1
	2
	DENG Shuxin1
	2
	LI Xinping3

Cite this article:

LI Jie1,2,JIANG Haiming1, et al. Nonlinear mechanical problems in rock explosion and shock. Part II：Physical model test on sliding of rock blocks triggered by external disturbance[J]. , 2018, 37(2): 291-301.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.0684 OR http://www.rockmech.org/EN/Y2018/V37/I2/291

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