Construction Method of Deep-buried Central Ditch in Single Line Railway Tunnel in High Cold and Expansive Soil Areas
In the construction of the single line railway tunnel deep buried in the central trench in the cold and expansive land area,the construction space is narrow,the foundation pit is deep,and the pit wall is prone to unstable and slippery collapse,and the construction is extremely difficult.The Woniu Tunnel of the Bei'an to Heihe Railway Upgrading and Reconstruction Project has serious seepage dur-ing the excavation of the deep buried central ditch,and the traditional spray anchor net construction method cannot ensure the stability of the pit wall and seriously threatens the safety of operators.In order to carry out the construction smoothly,a method of prefabricating supporting members outside the cave was researched and explored,and the supporting stiffness was formed in advance and directly hoisted into place after the excavation of the foundation pit.It makes a bold innovation in the traditional process,successfully solves the construction problem,and reduces the working time of personnel during the construction of the deep buried central trench and reduces the safety risk.
high cold regionssingle line railway tunnelexpansive soildeep-buried central ditchprefabricated support pattern
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