Integrated Technologies Of Settlement-reducing By Preloading And Anti-slip Embankment On Soft Ground

Because of the long highway route and complicated geological conditions,the source of roadbed filler in highway construction is very limited.Limited to cost,it is inevitable to choose local materials instead of high quality filler.Because of the rich water resources and the shortage of gravelly soil resources,it is significant to use water-cover preloading method at the riverside area in southeast coast.In this thesis,the development rules of preloading deformation of soft soil are obtained by preloading test of a large vacuum joint in a soft soil site in Zhoushan.Based on the hydrogeological conditions of the embankment in Wenzhou,this paper proposes a new type of water pocket surcharge preloading to replace vacuum combined surcharge preloading,and carries out technical test on site.At the same time,according to the engineering characteristics of deep soft clay along the coastal embankment,the embankment-bank construction technology is adopted.To achieve the goal of ecological function and beautiful environment,the ecological bank is designed on the basis of numerical simulation analysis.The main contents of this paper include:1.According to vacuum combined surcharge preloading of deep soft soil in Zhoushan,the surface settlement,layered settlement of ground,pore water pressure,inclination survey are analyzed.Based on the soil parameters after the ground treatment,the settlement is predicted and analyzed at the same time.2.Based on the specific project conditions of the embankment in Wenzhou,a new type of loading process is developed by water-load preloading method.On the basis of the traditional preloading method,combined with the specific application background of deep soft soil embankment,further innovation,pilot test,which make it become a set of mature green technology of embankment reduction.3.With the unique engineering properties of deep soft clay in Zhejiang coastal area and reasonable calculation parameters,the geotechnical catastrophic control model of draw near embankment is established from the two aspects of settlement andstability.The sliding of the slope is analyzed from the aspects of drainage plate,embankment filling slope ratio,unloading-reloading soil height and river excavation at the foot of the slope.4.On the basis of finite element simulation,according to the distribution of water and lake ponds on both sides of the highway,the ecological protection slope is divided into three types of roadbed(fish)pond,bridge head detention area and river(stream).Based on different slope and horizontal spacing of the river,different plants are selected and the corresponding design scheme of ecological protection technology is put forward.