砂桩排水板复合排水机理研究

目前复合排水地基固结度及强度无法从理论角度进行计算和预测,给工程设计及施工带来较大不便.针对这一问题,对砂桩排水板复合排水边界条件进行合理简化,推导出复合排水理论模型;并借助有限元软件PLAXIS 3D进行分析,将PLAXIS 3D计算结果与理论结果进行对比,并给出排水体控制区域不规则修正系数a的建议值.结果表明,理论模型计算结果与数值模拟结果相吻合;在砂桩间距大于3 m时,a值建议取1. 20～1. 35,当砂桩间距小于3 m时,a值建议取1. 35～1. 50.

Study on composite drainage mechanism of sand pile and drainage plate

At present,the consolidation degree and strength of composite drainage foundation cannot be calculated and predicted from theory,which causes inconvenience to engineering design and construction.Aiming at this problem,we rationally simplify the boundary conditions of composite foundation,deduce the theoretical model of composite drainage,analyze this problem by the finite element software of PLAXIS 3D,contrast the results of PLAXIS 3D with theoretical,and give the irregular correction coefficient of drainage control area a recommended value.The results show that the theoretical model results are consistent with the numerical simulation results.For the irregular correction coefficient of drainage control area,the recommended value of a is 1.20 to 1.35 when the distance between sand piles is more than 3 m,and is 1.35 to 1.50 when the distance between sand piles is less than 3 m.