岩石直剪峰后曲线与抗剪强度参数关系探讨

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摘要对多组泥岩、白云岩和灰岩试样进行直剪试验，利用不同法向应力下峰值剪切强度求得其抗剪强度参数 (内摩擦角和黏聚力c)。通过对剪应力–剪切位移曲线的进一步分析，发现峰后曲线和抗剪强度参数有以下关系：(1) 峰值剪应力与残余剪应力之间的剪应力跌落值近似等于黏聚力c；(2) 残余剪应力和法向应力关系可近似用内摩擦角来描述。将2种方法求得的抗剪强度参数进行对比，结果表明：在法向应力满足一定条件时，利用峰后曲线求得的抗剪强度参数可作为岩石的抗剪强度参数的近似值。基于对以上现象的理论分析，提出一种利用峰后曲线计算岩石的抗剪强度参数的近似方法，并给出该近似计算方法的具体计算过程。该方法较直观地解释了岩石直接剪切试验峰后曲线的物理意义。

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	张桂民1
	李银平1
	杨春和1
	王李娟2
	杨长来3

关键词 ：岩石力学, 直接剪切试验, 峰后曲线, 剪应力跌落, 残余剪切强度, 内摩擦角, 黏聚力

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

引用本文:

张桂民1，李银平1，杨春和1，王李娟2，杨长来3. 岩石直剪峰后曲线与抗剪强度参数关系探讨[J]. 岩石力学与工程学报, 2012, 31(S1): 2981-2988.
ZHANG Guimin1，LI Yinping1，YANG Chunhe1，WANG Lijuan2，YANG Changlai3. DISCUSSION ON RELATIONSHIP BETWEEN POST-PEAK CURVES AND SHEAR STRENGTH PARAMETERS OF ROCKS SUBJECTED TO DIRECT SHEAR TESTS. , 2012, 31(S1): 2981-2988.

链接本文:

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

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