Research On Key Technologies In Silt Dredging And Disposal Of Jinbao Channel

Construction projects of ports and waterways and large-scale dredging projects of rivers and lakes produce a large amount of dredging mud,which is often disposed of by storage in storage yards.Due to the characteristics of high moisture content,low strength and slow sedimentation and consolidation rate,the storage of dredging mud in the storage yard will inevitably lead to the problem of large area and long time use of land resources.Therefore,how to accelerate the consolidation of the dredging site so that it can have enough bearing capacity in a short time is a difficult problem for the dredging site to be quickly returned to cultivation and land recycling.In this paper,during the implementation of N1 storage yard in JinBao channel abandoned soil area of south-to-north water diversion project,a further large-scale engineering application test of key technologies of river and lake dredging storage yard is planned to further verify and deepen the effect of the technology,and to form the construction technology and clarify the economy of the technology.Through the field investigation and study on the spatial distribution rule of dredging silt and the engineering test and study on the rapid sludge separation technology and rapid consolidation technology of river and lake dredging yard,the following conclusions are drawn:(1)the particle separation in the dredging yard is mainly along the horizontal direction,and the degree of particle separation along the vertical direction is obviously smaller than that in the horizontal direction;(2)the optimal design of N1 storage yard was successfully achieved by adopting sludge and water separation technology,which reduced the land area of the storage yard by 20%,about 130 mu,and brought the expected technical effect into play in the project implementation stage;(3)the strength growth of natural conditions(no treatment),traditional vacuum preloading method and vacuum consolidation technology of plugging prevention are analyzed.The results show that the anti-plugging and rapid consolidation technology has significant advantages over the traditional vacuum preloading method.