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笔者在学习了大量的国内外有关专业文献的基础上,根据现场实测成果,运用综合分析和函数逼近方法揭示了软土深基坑外侧土体的位移场。笔者在建立平面应变位移场的过程中充分考虑到墙体刚度、土体刚度和强度、支撑时间、支撑预应力和刚度、基坑宽度和硬土层距地表的深度等多种因素对计算值的影响,使计算公式与实测结果基本吻合。此外笔者介绍了各种施工因素对基坑外侧土体位移场的实际影响程度。论文中的公式可用作预估软土深基坑开挖后基坑外侧土体的位移场,对基坑外侧的环境保护具有一定的指导意义。
On the basis of studying a large number of domestic and foreign relevant professional documents, the author revealed the displacement field of the soil outside the deep foundation pit of soft soil by using the comprehensive analysis and function approximation method according to the results of on-site measurement. In the process of establishing the plane strain displacement field, the author fully considered the wall stiffness, soil stiffness and strength, support time, support prestress and stiffness, the width of the foundation pit and the depth of the hard soil layer from the surface and other factors. The impact of the calculation formula and the measured results are basically consistent. In addition, the author introduces the actual influence degree of various construction factors on the displacement field of the soil outside the foundation pit. The formula in the paper can be used as a predicting displacement field of the soil outside the foundation pit after excavation of deep foundation pit in soft soil, which has certain guiding significance for the environmental protection of the outside of the foundation pit.