南水北调东线工程3个疏浚泥堆场踏勘调查及试验

Field and experimental investigations on three reclaimed yards of dredged soil in Eastern Route of South-to-North Water Diversion Project

针对土地资源日益紧张的现状,为使疏浚泥堆场临时征地尽快复垦利用,结合南水北调东线工程3个疏浚泥堆场进行现场踏勘调查、原位测试及室内试验。结果表明:河道疏浚方式、疏浚泥的土性及疏浚完成时间是影响堆场工程性状的主要因素;绞吸式疏浚施工的水力分选作用十分显著,堆场高程和强度随着与吹泥口距离的增大而逐渐降低;疏浚土的黏粒质量分数越高,透水性越差,在自然条件下越难固结;加强堆场表面水的排除可尽快形成表层硬壳层,有利于堆场的复垦利用。

In order to reclaim the dredged soil stockyards as soon as possible, in-site tests as well as field and experimental investigations on three reclaimed yards on the Eastern Route of the South-to-North Water Diversion Project are reported in this paper, due to the deficiency of land resources. The results show that： the methods of river dredging, soil features of dredged soil, and completion time are three important factors that influence the engineering properties of the stockyards; the hydraulic sorting effect of cutter suction construction is significant, and the elevation and strength of the stockyards decrease gradually with the distance to the location of filling-mouth; dredged soil with higher clay particle content has lower permeability and has more difficulties in consolidating under natural conditions; and surface drainage leads to the rapid fornlation of a stiff shell layer, and is also beneficial to the reclamation use of the stockyards.