Numerical Analysis and On-Site Monitoring Technology for Soft Rock Biased Pressure Tunnels in Complex Environments
In order to explore the mechanical and deformation characteristics of the structure during the construction of a soft rock biased pressure tunnel in complex geological environments,based on the construction of the Chongqing-Kunming high-speed railway tunnel project,numerical simulation software was used to analyze the excavation process of the tunnel,and comparative analysis was conducted with on-site monitoring data.The results show that numerical simulation can better reflect the actual construction status of the soft rock biased pressure tunnels,and the initial deformation rate of the tunnel excavation is relatively large,gradually converges in the later stage,with a maximum settlement of 206.72 mm and a maximum horizontal displacement of 249.09 mm;the maximum tensile stress of the initial support is 6.14 MPa,and the maximum compressive stress is 12.8 MPa,both of which exceed the tensile strength and compressive strength design values of concrete in the specifications to varying degrees;due to the high amount of on-site precipitation and the good water absorption of soft rocks,it has brought greater bias pressure effects of the tunnel,resulting in more complex deformation and stress on the deep buried side.Based on the results of numerical simulation and on-site monitoring,construction suggestions such as optimizing construction methods and increasing reserved deformation are proposed.
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