关埠引水工程内水压力作用下隧洞管片受力与接缝变形研究

Research on the Stress and Joint Deformation of Tunnel Segments under the Internal Water Pressure in Guanbu Water-Diversion Project

利用有限元软件建立关埠引水工程隧洞管片三维数值模型,系统分析了管片应力、接缝变形及螺栓应力在不同工况下的变化规律。结果表明:内水压力会显著影响隧洞衬砌管片的力学性能,随着内水压力的增大,管片应力、接缝变形及螺栓应力也随之增大,盾构隧洞衬砌管片最大拉应力为3.263 MPa,最大压应力为6.612 MPa、管片接缝变形最大为0.28 mm,TBM隧洞衬砌管片最大拉应力为0.192 MPa,最大压应力为2.952 MPa、管片接缝变形最大为0.08 mm,连接螺栓的应力变化与接缝变形能相互吻合,接缝变形越大,螺栓应力也越大,最大值为604.01 MPa。研究结果可为输水隧洞衬砌结构的设计与分析提供参考。

The three-dimensional numerical model of the tunnel segment of the Guanbu diversion project is established by using the finite element software,and the variation rules of the segment stress,joint deformation and bolt stress under different working conditions are systematically analyzed.The results show that the internal water pressure will significantly affect the mechanical properties of the tunnel lining segment.With the increase of the internal water pressure,the segment stress,joint deformation and bolt stress will also increase.The maximum tensile stress of the shield tunnel lining segment is 3.263 MPa,the maximum compressive stress is 6.612 MPa,the maximum segment joint deformation is 0.28 mm,the maximum tensile stress of the TBM tunnel lining segment is 0.192 MPa,the maximum compressive stress is 2.952 MPa,and the maximum segment joint deformation is 0.08 mm,The stress change of the connecting bolt is consistent with the joint deformation energy.The greater the joint deformation,the greater the bolt stress,and the maximum value is 604.01MPa.The research results can provide reference for the design and analysis of the lining structure of the water conveyance tunnel.