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Risk assessment and prevention countermeasure of geological hazard on Shanghai sector of the Tong-San national highway

GONG Shi liang, YAN Xue xin, WANG Han mei (Shanghai Institute of Geological Survey, Shanghai 200072,China)  
Shanghai sector of the Tong\|San(Tongjiang\|Sanya) national highway is built as expressway. Its length is 75\^5 km, covering an area of 4\^5×10\+6m\+2.It costs nearly 0\^7×10\+9 yuan(RMB). This paper analyses the possible influences by regional geological hazard, suitable prevention countermeasure has also been proposed. The geological hazard risk assessment is made with differential subsidence of line engineering as a major operation, and the subsidence control measure in the engineering design is disscussed.
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