Reinforcement Measures for Subway Tunnels Passing Through Upper Soft Soil and Lower Rock Strata
The subway tunnel of the first phase of Guiyang Urban Rail Transit Line S1 project passes through the upper soft soil and lower rock layers,and the excavation step is located at the boundary line between soil and rock.In response to this geological condition,a tunnel surrounding rock reinforcement measure combining sleeve valve pipe grouting reinforcement of the silt layer,middle pipe shed,and small pipe advance support was proposed.The tunnel construction process under this reinforcement scheme was studied using finite element analysis,revealing the internal force of the support during the subway tunnel construction process.The distribution and development law of surrounding rock deformation were studied,and corresponding suggestions were proposed for construction design.The final research results show that the internal force of support and the deformation of surrounding rock during tunnel excavation support meet the requirements,indicating the feasibility of reinforcement measures.
upper soft and lower hard stratasubway tunnelexcavation supportreinforcementfinite element analysis
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