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| Research on the Technology for Shallow Mining Tunnel in Loess Area Crossing Railway Turnout Zone |
| WANG Hai – xiang |
| (China Railway First Survey and Design Institute Group Ltd，Xi^an, Shaanxi 710043, China) |
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Abstract Abstract ： Research purposes ： According to the safety problems of railway operation and tunnel construction occurred to the engineering passing turnout area of national railway station yard in the tunnel of undercutting with shallow overburden in the saturated loess area， by means of engineering analogy and numerical simulation analysis method， this paper researched a number of key issues， such as the settlement control criterion of turnout area of existing railway， ground improving and strengthening，supporting measure and construction method of tunnel and track strengthening of turnout area，to provide the technical support for the engineering construction.
Research conclusions:( 1) The ground settlement control criterion of metro turnout area of mining tunnel under - passing national railway station yard can be considered as 15 mm， and the allowable settlement rate criterion of railway pavement can be considered as 5 mm^d, and then in non - turnout area, the criterion can be appropriately reduced. (2)The way to strengthen track of turnout area takes the principle of partition segment， non - turnout area using the form of strengthening D beams, turnout area using the system of strengthening vertical and horizontal beams. (3) With the ground improved by deep hole grouting in full section， the CRD construction method and the advanced support system of big pipe shed， the pre - convergence deformation of strata in front of tunnel face can be effectively suppressed， the settlement deformation of strata can be effectively controlled， and the safety of passing turnout area in saturated loess tunnel can be ensured. (4) The research results can provide references for the construction of the tunnel under - passing railway turnout area in loess area.
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Received: 05 May 2016
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2016, Vol. 33 
