岩石直剪峰后曲线与抗剪强度参数关系探讨

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Abstract With the direct shear tests on groups of mudstone，dolomite and limestone specimens，the internal friction angleΦand cohesion c are obtained by using peak stresses under various normal stresses. Moreover，further analysis for curve of the shear stress-shear displacement shows that the post-peak curve is interrelated to the shear strength parameters. The value of shear stress drop between peak and residual shear stress is approximately equal to the value of the cohesion c；and the relationship between residual shear stress and normal stress can be described approximately by internal friction angleΦ. By comparison of the parameters obtained respectively from above two methods，the results indicate that when normal stresses satisfy certain selected conditions，the shear strength parameters calculated from post-peak curves can be seen as approximate value of the rock shear strength parameters. Based on theoretical analysis of above mentioned phenomena，an approximate method to calculate shear strength parameters is proposed by using post-peak curves of rocks subjected to direct shear tests；and its concrete calculating process is also presented. Additionally，this method also explains visually the physical meaning of post-peak curves of rocks.

Key words： rock mechanics direct shear tests post-peak curves shear stress drop residual shear strength internal friction angle cohesion

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	Articles by authors
	ZHANG Guimin1
	LI Yinping1
	YANG Chunhe1
	WANG Lijuan2
	YANG Changlai3

Cite this article:

ZHANG Guimin1,LI Yinping1,YANG Chunhe1, et al. DISCUSSION ON RELATIONSHIP BETWEEN POST-PEAK CURVES AND SHEAR STRENGTH PARAMETERS OF ROCKS SUBJECTED TO DIRECT SHEAR TESTS[J]. , 2012, 31(S1): 2981-2988.

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https://rockmech.whrsm.ac.cn/EN/Y2012/V31/IS1/2981

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