考虑疏浚泥颗粒分选的堆场初始存储容积评估方法

Evaluation of Initial Storage Capacity for Containment Area Considering Grain Sorting of Dredged Slurries

吹填中高含水率疏浚泥的水力分选行为,容易造成堆场疏浚泥土性分布不均,影响堆场初始存储容积的准确评估。基于南水北调东线江苏段疏浚工程N1堆场的现场试验,考虑堆场疏浚泥颗粒分选的影响,借鉴美国陆军工程师手册《疏浚材料的隔离处置》(EM 1110-2-5027),探讨JTS 181-2-2012《疏浚与吹填工程设计规范》中堆场初始存储容积设计方法存在的问题,将疏浚泥分为粗颗粒区(I区)、粒径变化区及细颗粒富集区(II区)。I区考虑松散系数的影响,II区考虑疏浚泥土性区域分布的影响,提出一个切合实际的堆场初始存储容积评估方法。计算结果表明:当疏浚泥初始含水率超过1 000%时,颗粒分选显著。文章提出的堆场初始存储容积评估方法的计算精度比国家标准提高约15%,初始含水率越高,计算精度提高越多,更加切合工程实际,具有较好的适用性和推广价值。

The grain sorting of dredged slurries with high water contents is easy to lead to inhomogeneous distribution of soil proper-ties ,which has a great effect on accurate assessment of the initial storage capacity for containment area. Based on the field investigation of N1 containment area in the Eastern Route of South - to - North Water Transfer Project, a method of initial storage capacity design for containment areas is proposed considering the grain sorting. The method draws on the experience of the engineer manual ： confined dis-posal of dredged material （EM 1110 -2 -5027）. The method of initial storage capacity design of national standard, i. e. design code for dredged and reclamation works （ JTS 181 - 5 - 2012） was discussed. The results show that the precision of the method is 15% higher than national standard when initial water content of dredged slurry is more than 1 000% . When initial water content is high, grain sorting is significant, and the precision is higher than national standard. The method has good applicability and promotional value.