双支撑工作模式下TBM撑靴与围岩接触仿真

Simulation of Contact Between TBM Boots and Surrounding Rock Under Double Support Working Mode

撑靴为TBM的前进及稳定性提供保障,与围岩的接触是否均匀直接影响工作的稳定性,针对撑靴与围岩接触会因为应力分布不均匀而导致支撑不稳或围岩坍塌等问题,以新型TBM的撑靴为研究对象,根据试验台的三维模型创建撑靴和其他机构之间的力传递特性,建立双支撑工作模式下撑靴与围岩的接触模型,采用有限元方法研究撑靴与围岩接触面应力、位移分布。结果表明:撑靴与围岩的综合应力分布较为均匀,在周向尺寸上分布在-18°~18°范围内,撑靴接触表面最大应力为13.3 MPa,围岩接触表面最大应力为4.03 MPa。撑靴接触表面综合位移中间小、两端大,而在围岩接触表面综合位移中间大,向四周位移逐渐减小。并且运用赫兹公式对有限元分析的结果进行验证,误差为0.5 MPa,表明分析结果可靠,为提高整机稳定性提供了参考。

Taking the new TBM boots as the research object,the force transmission characteristics between the boots and other mechanisms are created according to the three-dimensional model of the test bench.The contact model between the boots and the surrounding rock in the double-support working mode is established,and the finite element method is used to study the support.The stress and displacement distribution of the contact surface between the boot and the surrounding rock shows that the comprehensive stress distribution of the support shoe and the surrounding rock is relatively uniform,and it is distributed within the range of in the circumferential dimension.The maximum stress on the contact surface is 13 MPa,and the maximum stress on the contact surface of the surrounding rock is 4.03 MPa.The comprehensive displacement of the contact surface of the support shoe is small in the middle and large at both ends,and the displacement at the contact surface of the surrounding rock is large,and the displacement to the periphery gradually decreases.The analysis results provide some reference for improving the stability of the whole machine.