TUNNELING IN SQUEEZING GROUND CONDITIONS：WITH A CASE STUDY OF YANMENGUAN RAILWAY TUNNEL
XU Zailiang1，SUN Yuanchun1，2
(1. The 3rd Railway Survey and Design Institute Group Corporation，Tianjin 300142，China；2. School of Civil Engineering， Southwest Jiaotong University，Sichuan，Chengdu 610031，China)
Abstract：Squeezing rock refers to weak rock under high grostress，so squeezing ground conditions conclude high grostress and weak rock，it means large convergences of the tunnel walls. Squeezing ground conditions have posed and continue to pose a major obstacle to the construction of tunnels through mountains. The Yanmenguan railway links the city of Datong to Yuanping in China through the Hengshan mountains. The tunnel is 14.1 km long with a two lane horse-shoe section，which is excavated in Archean plagioclase gneiss and granitic gneiss at depths of up to 820 m below surface，and extreme squeezing problems have been encountered，especially in sections of DK121+203–DK121+175. Based on analysis of engineering geological conditions，stability of surrounding rock and deformation monitoring，it is found that：(1) The sections of DK121+203–DK121+175 locate at fracture zones of ancient metamorphic rocks. (2) Rock mass quality and geostress conditions are key factors for the stability of surrounding rock. (3) Surrounding rock deformation sharply increased mainly due to excavation of middle，under bench and invert. (4) The effect is obvious to control surrounding rock deformation by strengthening the primary support and radial grouting behind primary support.
许再良1，孙元春1，2. 雁门关铁路隧道挤压变形问题分析[J]. 岩石力学与工程学报, 2014, 33(S2): 3834-3839.
XU Zailiang1，SUN Yuanchun1，2. TUNNELING IN SQUEEZING GROUND CONDITIONS：WITH A CASE STUDY OF YANMENGUAN RAILWAY TUNNEL. , 2014, 33(S2): 3834-3839.
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2014, Vol. 33 
