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| RAILWAY ENGINEERING GEOLOGY AND CONSTRUCTION PRACTICE AT PLATEAU REGIONS OF SOUTHWEST CHI-NA——ALONG NANNING-KUNMING RAILWAY LINE AS EX AMPLE |
| Lu Yulong |
| Second Survey and Design Institute of MOR |
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Abstract The Nanning-Kunniing Railway has a total length 863km passing through the Yun-Gui Plateau with a relative difference of height 2000m. As the topography along this railway line are greatly up and down，the construction works are extremely difficult with so much section's having continuous bridges and tunnels. The straturns of different Period from the later Proterozoic Era to the Cenozoic Era expose everywhere. The area is situated at the southwest edge of the Yangtze quasi-platform with crowded distribution of faults，long ac?tive fracture sections, 9-degree earthquake regions and special varied geology and geological structures，etc. As the railways cross through this area, there are plenty geological diseases. Especially，passing through a 400m calcareous section with highly growing soluable karst. rocks,large amount of special engineering designs are needed for constructing bridges,tun?nels and subgrades. Furthmore,there is a long section of expansive rocks with strong expan-sivity ,which renders the subgrade and other construction works very difficult. Concerned with the above geological diseases，the route selection designs and the effective countermea?sures are described and discussed in this paper.
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Received: 15 May 1996
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1996, Vol. 13 
