真空预压处理填埋污泥的固结解析解

真空预压法是一种行之有效的填埋污泥原位加固方法。在考虑真空预压的时间效应条件下,基于椭圆柱等效模型推导了真空预压联合塑料排水板的固结解析解。利用实际监测数据,拟合得出了预压时间效应参数。通过对比研究,分析了传统的圆柱形等效模型与椭圆柱等效模型的差异及预压时间效应参数对固结发展的影响。进一步,将根据解析解计算出的沉降曲线与实测沉降值比较,验证了解答的合理性与实用性。表明,在考虑塑料排水板的"形状效应"时,椭圆柱体等效模型的效果最佳,且基于各周长等效模型的计算结果与椭圆柱等效模型结果较为接近;预压时间效应参数的值越大代表真空预压施加得越快,对应的土体固结发展越快。

Analytical solutions for the consolidation of sludge by vacuum preloading

The vacuum preloading is an effective method for the in-situ consolidation of sludge in landfills. Considering its time effects, the analytical solutions for the consolidation by the vacuum preloading combined with the prefabricated vertical drain are obtained based on the equivalent elliptical cylinder model. Then, the parameter reflecting the time effects is obtained by fitting the measured data. The comparative analysis is carried out to validate the rationality and the practicability of the proposed solutions by comparing the settlement curve calculated from the proposed solutions to the measured one. The analysis results show that the elliptic cylinder equivalent model is the optimum choice to consider the shape effects of the PVD, and the calculated results based on the perimeter equivalent models are closer to those based on the elliptic cylinder equivalent model. The larger parameter α means the vacuum pressure is applied on the soil more quickly, which will lead to a quicker consolidation process.