Settlement Forecast Of Soft Foundation Covered By Fill Sand On Coastal Regions And Research On Reinforcement Effect

The soft soil widely distributes in Pearl River Delta area,its engineering characteristic is bad with bigger void ratio,higher water content,lower intensity.In engineering constructing ,we have to reinforce the soft ground because of its lower carrying capacity and aptness to deform. In fact,it is cost-effective and convenient in the coastal areas to use the resource-rich sediment for engineering and reinforcing. This article is based on the preloading soft foundation treatment of the second phase project in ShaTian port under HuMen port in DongGuan. Using the FLAC^3D software to do the settlement estimated simulation of the softweak ground work, based on the previous work, through the local testing, theoretic study, numerical value simulation ect ways, to do the mainly following aspects of works:1.Firstly, several commonly prediction models and the numerical calculation methods of soft foundation settlement were given out,and the consolidation mechanism and consolidation characteristics of preloading with sand wick were researched.2.Furthermore, this paper narrates the general situation, design program, monitoring program of the experimental segment.Then the author reveals the current of vertical settlement and horizontal displacement and the distributing disciplinarian for the soft soil foundation under the filled sand.Then the paper analysis the reinforcement effect with the data measured from laboratory test and vane shear test,and summarizes some elements to effect the reinforcement effect of soft soil foundation.3.Thirdly, based on the actual settlement,the paper forecasts and calculates the experimental area settlement with stage loading by hyperbola method,exponential curve method, Asaoka method and modified posson curve.The calculation results of different methods are compared and analyzed to conclude that the proposed method is a suitable method to forecasts the settlement of the soft soil foundation under the filled sand.These solution can provide the basis and reference experience on the similar projects.4.Finally, through the simplified method of sand drains and the establishment of sand drains'three-dimensional solid element,this paper uses FLAC^3D software to calculate the three-dimensional consolidation of the experimental area. Found the better consistent situation between the software simulation calculation result and the local testing result,and validate the veracity and practicability of the model calculation.