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| DESIGN MADE FOR COMPLEX GEOLOGICAL SECTION OF JINGZHULING TUNNEL ON SUINING-CHONGQING RAILWAY LINE |
| ZHAO Wan-qiang |
| The Second Survey and Design Institute of China Railway, Sichuan Chengdu 610031 |
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Abstract Research purposes: The design is made for eliminating the possibility of happening construction accident arisen by karst burst water in Jingzhuling Tunnel, avoiding subsidence arisen by damaged water environment due to large leak and loss of ground water while the tunnel crossing the karst section and solving the problems of influences on the strength, stability and durability of tunnel structure by the tunnel crossing huge karst caves group, underground river and karst burst mud section as well as expansion corrosively of gypsic horizon.
Research methods: Based on the integrated concept of water conservancy environment protection, safety and running relief, the system is equipped with auxiliary pit, the advanced geological prediction is done further to the special section, blocking water by grout curtain is done in combination with dredging underground river of karst cave to the rich water section and the similar calculation is made by adopting numerical values of ANASYS program.
Research results: The design of the tunnel crossing karst cave, Underground River and burst mud section, design of supporting structure to gypsic horizon and design of lining against water pressure are completed.
Research Conclusions: The construction of the tunnel structure and running safety are ensured by the design concept of water conservancy and drainage to the rich water and Underground River of karst cave sections, and design measures for the complex geological section, for reference to the design of similar project in complex geological section.
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Received: 26 September 2005
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2006, Vol. 23 
