This study examines the feasibility of a combined counterforce wall and steel structure counterforce frame for the jacking pipe construction of the Jiaohua Reservoir water supply project,based on the project's actual working condi-tions.Stress simulations were conducted using SAP2000 software.The results indicate that both the masonry counter-force wall and the counterforce frame system satisfy the counterforce requirements for the jacking machine in terms of sliding stability.However,while the masonry counterforce wall requires a lengthy manual construction process,the counterforce frame system offers a more efficient construction timeline and simplified assembly.Consequently,the steel structure combined counterforce frame system is considered superior.The sliding stability safety factor of the structure is 3.38,exceeding the allowable safety factor of 3.0,thus ensuring stability.The maximum tensile stress and compres-sive stress of the structure are 318.34 MPa and 207.61 MPa,respectively,and the stress analysis results meet the safety performance requirements for Q345 steel.Furthermore,the maximum deformation(6.75 mm)is well within the allowable deflection limit of 9.18 mm,thereby satisfying deformation criteria.Overall,the steel structure combined counterforce frame system demonstrates robust technical feasibility.
关键词
隧洞/岩石顶管掘进技术/顶推力/反力架/双碳
Key words
tunnel/rock top pipe excavation technology/top thrust/reaction frame/dual carbon
维普
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