雁门关铁路隧道挤压变形问题分析

doi:10.13722/j.cnki.jrme.2014.s2.056

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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.

Key words： tunneling engineering squeezing deformation weak surrounding rocks geostress

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	XU Zailiang1
	SUN Yuanchun1
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XU Zailiang1,SUN Yuanchun1,2. TUNNELING IN SQUEEZING GROUND CONDITIONS：WITH A CASE STUDY OF YANMENGUAN RAILWAY TUNNEL[J]. , 2014, 33(S2): 3834-3839.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.s2.056 OR https://rockmech.whrsm.ac.cn/EN/Y2014/V33/IS2/3834

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