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| CALCULATION AND CONTROL OF WATER PRESSURE ON KAST DEEP TUNNEL |
| JIANG Zhong-xin |
| The second Survey and Design Institute of Railway，Chengdu 610031，China |
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Abstract Research purpose: for protecting water resource and environment on tunnel，strengthening water drainage as a design principle can not meet the demand of environmental protection, with choking up underground water as a design principle of karst deep tunnel begin tried already. The tunnel lining endures huge water pressure when underground water is blocked up, in which a key problem is calculating and controlling water pressure on tunnel at choking up underground water.
Research method: because the water pressure is influenced double by head loss and contact area between karst water and tunnel lining, based on regulate decrease coefficient of head on karst tunnel, analysis model of water pressure on tunnel.
Research result: the formula calculating the water pressure on karst tunnel with vadose water discharge is advanced. Then, control principle with suitable drainage and grouting in country rock based on water environmental balance on the tunnel is discussed, and formulas calculating the water pressure on grouting circle and lining of tunnel are advanced.
Research conclusion: above formulas calculating the water pressure are tested with measured data in prospect cavity of the second Jinping hytropower plant and in Yuanliangshan tunnel of the Chongqing-Huaihua railway as an examples, and the water pressure values more conform to reality.
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Received: 22 March 2005
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2005, Vol. 22 
