塑料排水板地基处理固结沉降特性

为了研究塑料排水板在深厚填土地基中对固结度和沉降的影响,结合福建某堆载-塑料排水板联合地基处理工程,分析计算了仅堆载和加设塑料排水板两种情况下的固结度计算。指出了软土地基处理在填土加载的同时,必须结合竖向排水体才能符合工程需要,且计算固结度时必须考虑井阻和涂抹作用。选取了淤泥土的沉降计算经验系数及杂填土的计算参数,分别计算淤泥层和杂填土的沉降,沉降计算及固结度预测与实际观测数据相符。工程监测数据表明:分层沉降观测数据与地面沉降测点沉降曲线基本一致,孔压的消散曲线与该测点附近的地面沉降测点的沉降时间关系曲线基本一致,能正确反应地基土的孔压消散情况,且在地基处理施工过程中加载没有造成较大的侧向位移,表明项目设计合理,达到预期要求,可为类似地基处理工程提供理论借鉴。

Characteristics of Consolidation Settlement in Ground Treatment for Plastic Vertical Drain

In order to study the effect of consolidation settlement in ground treatment for,the consolidation which consider two different situations was analyzed combining an engineering of preloading combined with technique to ground treatment,such as preliminary press by accumulated load only or add.It is pointed out that the pre-compression fill in the treatment of the soft soil must be combined and the effect of well resistance must be considered in calculating consolidation.Settlement experiential coefficients of silt and parameters of miscellaneous soil were selected to calculate soil layer settlement separately.Settlement value and consolidation were coincided with observations value as well as the layered settlement.And the curve was coincided with observations value which can reflect dispersion of pore water pressure well.The small lateral movement indicates that this project design is reasonable and conform expected demand which can provide academic reference to similar project.