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		寒区非圆形隧道冻胀力的解析解 1)
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			ANALYTICAL SOLUTION OF FROST HEAVING FORCE IN NON-CIRCULAR COLD REGION TUNNELS 1)
			 
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		 图 1. $Z$平面保角变换为$\zeta$平面示意图  | 
	
Fig. 1. Conformal mapping of tunnel in $z$-plane in to two concentric circles in $\zeta$-plane  | 
	
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