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		基于指数准则在莫尔空间对岩石剪切强度的研究
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			STUDY ON SHEAR STRENGTH OF ROCKS USING THE EXPONENTIAL CRITERION IN MOHR'S STRESS SPACE
			 
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		 图2. 五种砂岩的强度及指数准则的拟合[  | 
	
Fig.2. Fitting curves using the exponential criterion for strengths of sandstones cited from Refs. [  | 
	
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