分布式排水边界下均质地基固结有限元分析

针对地基固结前期排水量大而固结后期排水量小的特点,提出了一个分布式排水的边界条件。在Terzaghi一维固结理论的基础上,利用ABAQUS有限元软件实现了分布式排水边界下的固结模拟计算,分析了排水口间距和排水口大小对地基固结的影响规律,设计出最佳的分布式排水边界布设,进而探讨土体渗透系数和土体厚度对分布式排水边界下均质地基固结的影响。研究结果表明,相比完全排水边界,分布式排水边界虽不能完全满足固结前期的排水需求,但能够很好地满足固结中后期的排水要求,同时对于土体整体固结影响较小,为减少砂垫层的铺设提供了理论依据。

Finite element consolidation analysis with distributed drainage boundaries in homogeneous ground

Based on the characteristics of the great displacement of foundation consolidation in the early stage and small displacement during the late stage, a distributed drainage boundary condition was presented. Based on Terzaghi''s one-dimensional consolidation theory, the simulation calculation of soil consolidation under the distributed drainage boundary was realized by using ABAQUS finite element software. The effects of drainage spacing and the size of drainage outlet on the ground consolidation were analyzed, and the optimal distributed drainage boundary designed. Then the influences of soil permeability coefficient and thickness of the soil on the consolidation of homogeneous foundation under distributed drainage boundary were discussed. The research result shows that,compared with complete drainage boundary, the distributed drainage boundary cannot meet the requirements of the water drainage in the early stage, but it can completely meet the requirements of the water drainage in the middle and later periods of consolidation. At the same time, the distributed drainage boundaries about the overall of soil consolidation have little effect. The research results provide a theoretical basis for reducing the laying of sand cushion on saturated clay drainage consolidation.