堆载预压塑料排水板参数研究

Study on Parameters of Plastic Drainage Plate for Surcharge Preloading

塑料排水板的打设深度、打设间距及渗透系数对软基固结沉降有重要的影响。结合塑料排水板处理超大面积软基工程实例,基于ABAQUS对塑料排水板参数进行敏感分析。将计算的地表沉降及孔隙水压力曲线和现场监测值对比,验证模型合理性。通过改变塑料排水板参数分析对地表沉降和超孔隙水压力的影响。结果表明:塑料排水板的打设深度、打设间距及渗透系数能显著改变地基超孔隙水压力,能加速软土地基排水固结,但对于地表最终沉降量并没有影响。

The depth, spacing and permeability coefficient of plastic drainage plate have vital influence on the consolidation settlement of the soft soil foundation. Combined with an engineering example of reinforcing oversized soft-soil foundation, this paper has an sensitivity analysis of parameters for plastic drainage plate using ABAQUS. The calculated settlement curve and pore pressure curve of soft soil foundation agree with the measurements, confirming the rationality of the model. By changing parameters of plastic drainage plate, it observed the variation of excess pore water pressure and surface subsidence. The results show that the depth, spacing and permeability coefficient of plastic drainage plate can change excess pore water pressure and accelerate the consolidation settlement of soft soil foundation, but have few effects on the final surface subsidence.