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目前的地层损失参数和土体变形计算方法不能反映顶管施工的动态过程,重新定义顶管施工过程中的地层损失参数,使之可以反映超挖、欠挖等不同工况。基于Mindlin解,改进间隙参数g,从而可以考虑管壁与土的摩擦力。基于开挖面周围土体的扰动分区,修正Loganathan土体变形公式,并将改进的间隙参数g代入修正公式,计算顶进距离不同时的土体变形,获得顶管推进过程中地表测点的动态变化。算例分析表明,计算结果与监测数据吻合较好。
The current formation loss parameters and soil deformation calculation method can not reflect the dynamic process of pipe jacking construction and redefine the formation loss parameters during pipe jacking so as to reflect the different conditions such as over-excavation and under-excavation. Based on the Mindlin solution, the gap parameter g is improved so that the friction between the pipe wall and the soil can be considered. Based on the perturbation zoning of soil around the excavation face, the deformation formula of Loganathan soil is amended. The modified clearance parameter g is substituted into the correction formula to calculate the deformation of soil under different jacking distances. Dynamic changes. The case study shows that the calculated result is in good agreement with the monitoring data.