含弱夹层组合岩石变形破坏演化特征实验研究

doi:10.13722/j.cnki.jrme.2021.0280

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Abstract The deformation and failure evolution characteristics of combination rock with weak interlayers are studied by using a CCD camera as observation method，and the deformation field under uniaxial compression is analyzed by the digital speckle method. Then the effect of the interlayer interaction is theoretically analyzed. The results indicate that the horizontal tensile strain localization zone first appears in the middle weak interbedded rock，and that，as the load increases，the localized zone develops towards the rock contact surfaces. Under the interlayer action，the upper and lower layers of rocks produce localized zones and appear vertical tensile cracks first，greatly reducing the compressive strength of the weak interlayer composite rock. The middle weak-strength rock is affected by the upper and lower layers of rock and undergoes tensile failure，resulting in the final failure of the specimen. After cracks appear in the upper and lower rocks，in the area to the left of the cracks，the restraining effect of the upper and lower rocks on the weak-strength rocks in the middle is weakened，causing the compressive strength of this part of the rock to drop suddenly and even failure. The theoretical calculation shows that，in a certain range from the interlayer contact surface，the compressive strengths of the upper and lower layers of rocks decrease while the compressive strength of the middle weak layer increases. The variation range of the compressive strength is related to rock mechanics parameters. The theoretical calculation also reveals that the compressive strength of the upper and lower layers of granite is reduced to 32.514 MPa，about 0.32 times of the initial strength and smaller than the compressive strength of the intermediate weak-strength rock，and hence，is the controlling factor of the compressive strength of the weakly interbedded rock. The compressive strength of the rock with weak interlayers obtained through model experiment is 33.91 MPa，which is consistent with the theoretical calculation result. It is observed that，during the experiment，the upper and lower layers of granite first appear cracks，indicating that their compressive strength is lower than that of the middle weak-strength rock，which is also consistent with the theoretical analysis. The results can be used as a reference for the occurrence mechanism and prevention of coal pillar rock burst.

Key words： rock mechanics composite rock with weak interlayer deformation evolution compressive strength digital speckle correlation method impact ground pressure

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	XU Hailiang
	ZHU Wanyu
	SONG Yimin
	AN Dong
	SUN Jindou

Cite this article:

XU Hailiang,ZHU Wanyu,SONG Yimin, et al. Experimental study on deformation and failure evolution characteristics of combination rock with weak interlayers[J]. , 2021, 40(12): 2402-2410.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0280 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I12/2402

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