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Abstract There are several bad geological phenomena, such as:the mined—out areas, the storm of sand along the valley of Dayanghe River in west segment of Datong—Qiahuangdao t and the Beijing—Baotou Railway Line passes there situated on Yanshan Mountain subsidence belt. The Sangganhe River gorge with high mnimtains and rl.^ep valleys is v^ry complicated in geological structure. Varied harmful geological phenomena are widespread whether a bet?ter alignment could be chosen was the key that decided the west segment could be straight.
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Received: 18 April 1996
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1996, Vol. 13 
