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		水工圆形隧洞围岩衬砌摩擦滑动接触的新解法 1)
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			A NEW SOLUTION FOR FRICTIONAL SLIP CONTACT BETWEEN SURROUNDING ROCK AND LINING IN A HYDRAULIC CIRCULAR TUNNEL 1)
			 
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		 图4. 接触面上接触应力随摩擦系数$f_r $ 变化的分布规律  | 
	
Fig. 4. Distributions of the contact stresses on the interface for different $f_r $  | 
	
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