损伤与破裂岩样力学特性试验研究

doi:10.13722/j.cnki.jrme.2020.0124

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Abstract The state of surrounding rock faced in the development of deep mineral resources is essentially different from that of shallow roadways. The fracture degree of the surrounding rock in deep roadways is more serious，and the mechanical properties of the fractured rock are quite different from the intact rock. To investigate the mechanical behaviors of damaged and fractured rock，a preparation method of damaged and fractured rock samples by triaxial test through simultaneously unloading axial and confining pressures was proposed，and an apparent damage and fracture variable taking into account the degradation of the elastic modulus and the influence of the plastic deformation was defined for describing the damage fracture behaviors of rocks. The MTS 815 rock mechanics test system was used to carry out triaxial unloading tests at 8 unloading points including pre-peak，peak，post-peak and residual，and rock samples with different damage and fracture degrees were obtained. Through the triaxial compression test of damaged and fractured rock samples，the relationships between the peak stress，strength and deformation parameters and dilatancy characteristics with the confining pressure and the damage fracture degree were revealed. The test results show that the stress-strain curve of the triaxial reload test of rock samples with different damage and fracture levels still has 5 stages of the conventional triaxial compression test of intact rock samples. However，the curve of post-peak softening section of rock samples with a high damage and fracture degree is gradually gentle，showing certain plastic deformation characteristics. The peak stress，strength and deformation parameters of rock samples are positively correlated with the confining pressure，and the confining pressure has a significant inhibitory effect on the volume expansion of rock samples. As the damage and fracture degree of the rock sample increases，the reloaded rock sample after unloading is more likely to expand，the peak stress and the elastic modulus of the rock sample will decrease，while the generalized Poisson¢s ratio will increase.

Key words： rock mechanics damaged and fractured rock post-peak mechanical properties volume expansion triaxial reloading tests

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	Articles by authors
	MENG Qingbin1
	2
	QIAN Wei1
	PU Hai1
	HUANG Bingxiang2
	WANG Congkai1
	SUN Wei1
	WANG Jie1

Cite this article:

MENG Qingbin1,2,QIAN Wei1, et al. Experimental mechanical properties of damaged and fractured rock samples#br#[J]. , 2020, 39(8): 1534-1546.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0124 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I8/1534

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