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| Research on Construction Technology in Karst Area of Xiangshan Tunnel of Longyan － Xiamen Railway |
| ZHANG Mei1，ZHANG Min － qing1，HUANG Hong － jian1，SUN Guo － qing2 |
| 1． The Engineering Management Centre of Ministry of Railways，Beijing 100844，China; 2． China Railway Tunnel Group Co． Ltd，Luoyang，Henan 471009，China |
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Abstract Research purposes: The sections of DK 24 + 083 ～ DK 24 + 232 and YDK 24 + 098 ～ YDK 24 + 304 of the Xiangshan Tunnel of the Longyan － Xiamen Railway are in the areas with the closed karst senke，granite and fully weathering sandstones． The karst cave，karst groove and pipelines are interconnected to form a huge water store structure． After conducting full face curtain grouting，the large － scale water and mud bursting occurred to flood the shaft and cause the ground collapse when excavation was done． The drainage was completed on the back slope of the entrance end by using the plugger that can be passed through by water but not by mud in the ground of the tunnel． Subsequently， the informalization comprehensive grouting technology was used for the karst section，and for reinforcing the breaking open，the drainage for reducing the pressure，the grouting for reinforcing and the pipe roof for supporting were conducted on both ends．
Research conclusions: ( 1) The plugger that is passed through by water but not by mud can be used by grouting into the deep hole on the ground． ( 2) Based on meeting the quality reuirement，the construction speed can be doubled by using the informalization comprehensive grouting technology，compared with the full face curtain grouting technology． ( 3) the principle of drainage for reducing the pressure，the grouting for reinforcing and the pipe roof for supporting can be used for reinforcing the breaking open caused by water and mud bursting．
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Received: 09 June 2011
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2011, Vol. 28 
