基于双参数弹性地基的隧道钢拱架内力分析

根据隧道钢拱架的受力特性,可以等效为弹性地基上的曲梁,针对隧道支护结构的受力,在传统的曲梁力学模型中考虑轴向应变以及地基环向抗力因素并将围岩看做双参数弹性地基,推导出相应的平衡控制方程并得到对应模型下的径向位移和内力公式.通过应用到实际工程,使用隧道监控量测数据对隧道支护结构的内力进行计算,得到考虑轴向应变以及地基环向...

Internal Force Analysis on Tunnel Supporting Structure Considering Axial Strain

According to the stress characteristics of the steel arch frame of the tunnel, it can be equivalent to the curved beam on the elastic foundation. According to the stress of the tunnel support structure, the axial strain and the circumferential resistance of the foundation are considered in the traditional curved beam mechanical model, and the surrounding rock is regarded as the double parameters elastic foundation beam model. The corresponding balance control equation is derived, and the radial displacement formula and the internal force formula under the corresponding model are obtained. By applying it to practical engineering, the internal force of the tunnel supporting structure is calculated by using the monitoring data of the tunnel, and the internal force distribution diagram of the steel arch considering the axial strain and the circumferential resistance of the foundation is obtained, which is compared with the results of the field monitoring. The method is an advanced method for analyzing the internal force of tunnel support structure, and provides reliable mechanical basis for the stress analysis of tunnel steel arch.