竖井正方形地基固结度解答及其应用

Solution and application of vertical drain consolidation theory considering a square influence area

推导考虑正方形影响区以及影响区边界透水性的竖井地基固结度解答式。在面积相同的情况下,不同形状的影响区(正方形、正六边形、圆形)的固结度计算结果存在一定的差别。用圆形形状代替正六边形形状产生较小的计算误差,而用圆形形状代替正方形形状则会产生较大的计算误差。在考虑时间离散以及孔压传递的因素的基础上,将竖井正方形固结解应用于对模袋系统固结度的估算,估算结果与有限元计算结果基本完全吻合,而与实际室内实验结果存在较小误差,但是在误差允许范围之内。通过几何参数分析,为设计人员改善系统排水条件、实现加快系统固结提供参考,通过物性参数分析,对模袋系统材料的选取提供依据。

A consolidation solution considering a square influence zone and boundary permeability was obtained. The results are different among consolidation theory with different shapes （including a square zone, a regular hexagonal zone and a circular zone）. The result difference between a regular hexagonal zone and a circular zone is small but the result difference between a square zone and a circular zone is large. After considering the factor of time discretization and the factor of pore pressure transmission, the theory is applied to the estimation of degree of consolidation of soilbag filled with mud soil buried with PVD system. The estimation result shows a good coincidence with the FEM calculating result and shows some difference with the lab experiment result, which is within the margin of error. Analysis of the geometry parameter can improve draining of the soilbag system while analysis of the physical parameter can provide qualitative judgment.