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为研究盾构隧道施工过程建模影响因素及其影响程度,首先,综合隧道开挖过程中盾构机前体与岩土体影响因素耦合作用分析,构建盾构隧道开挖过程仿真模型,给出地表沉降和隧道垂向应力;然后,进一步模拟去除其中一种因素的隧道开挖过程,求出相应的地表沉降和隧道垂向应力;最后,基于傅里叶变换对各种情况下地表沉降量和应力应变状况进行比较分析,找出各因素对建模的影响程度。结果表明:一方面,建模过程中各种因素对地表沉降的影响大于对隧道垂向压力影响;另一方面,盾构机推进给开挖面土体压力、盾尾灌浆延迟管片拼装造成的暂时性土体支撑力不足、盾构机刀盘转动给开挖面土体扭力等因素对模型解算造成的影响最大。本研究对提高盾构隧道施工过程建模的准确性和实效性,指导盾构隧道施工具有重要指导作用。
In order to study the influential factors and the influence degree of shield tunneling process modeling, firstly, the coupling effect of shield machine precursors and rock mass influencing factors during tunneling is analyzed, and the simulation model of shield tunneling excavation process is established. Then, further simulating the tunnel excavation process to remove one of the factors, find the corresponding surface subsidence and tunnel vertical stress; Finally, based on the Fourier transform of surface subsidence in all cases Volume and stress-strain analysis of comparative analysis to find out the impact of various factors on the modeling. The results show that: on the one hand, the influence of various factors on surface subsidence is greater than the vertical pressure on the tunnel; on the other hand, the shield machine advances the pressure on the excavation surface soil, Of the temporary soil support force is insufficient, and the influence of torsion and other factors on the model solution caused by the rotation of the cutterhead of the shield machine to the excavation surface has the greatest impact. This study has an important guiding role in improving the accuracy and effectiveness of modeling the construction process of shield tunnels and guiding the construction of shield tunnels.