1. Science and Technology Research Institute of China Railway Tunnel Group Co.，Ltd, Luoyang, Henan 471009， China; 2. Yichang-Wanzhou Railway Construction Headquarter, Enshi, Hubei 445000, China; 3. China Railway Siyuan Survey and Design Group Co. , Ltd , Wuhan , Hubei 430063，China
Abstract：Research purposes:Based on the real measurements of water pressures of the tunnels on Chongqing- Huaihua Railway and Yichang-Wanzhou Railway, the researches are done on the effect factors and calculation formula for the original water pressure of the karat tunnel as well as on influence of rainfall on the water pressure. Based on the monitored values of water pressure, the curve of the water pressure is mapped and the analysis of its characteristics is made. The proposals are made for conducting secondary lining against the water pressure after making analysis of the water pressure after grouting.
Research conclusions: The water pressure of the karat tunnel relates to the basic elevation of drainage facilities on the up and bottom and their drainage capacity, so the water pressure can not be determined by deducting the coefficient. The water pressure has responds to the rainfall. The boosting test of the water pressure after drainage can reflect the karat geometrical figure. The design of secondary lining structure should be made according to the geological conditions, original water pressure and grouting effects.
张民庆，黄鸿健，苗德海，田四明. 岩溶隧道水压力的研究与确定[J]. 铁道工程学报, 2008, 25(5): 53-58.
ZHANG Min-qing，HUANG Hong-jian，MIAO De-hai, TIAN Si-ming. Study on and Determination of Water Pressure of the Karst Tunnel. 铁道工程学报, 2008, 25(5): 53-58.
2008, Vol. 25 
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