Research On The Law Of Dynamic Compaction For Reinforcing Filled Foundation

With the development of the national large-scale project construction, the contradictionof land becomes more keen-edged. In order to avoid competing land with fertile land, manycities put forward the development strategy of “exploded hill and filled valley". Dynamiccompaction method will become the important way to solve the problem of land tensionbecause of the land manufacturing in complex landform and geological conditions ofmountainous areas.However, it will form the slope with airport surface when form fill groundusing dynamic compaction method. It is because of the influence of the airport surface ofslope that leading to the differences of reinforcement effect of dynamic compaction and theresponse rule of soil with those of general construction sites which can be the half infinite boundary conditions of the confining soil around. The soil can not be compacted in a certainrange which is near the sloping surfaces. At the same time,due to the slope of the ups anddowns, the lows of vibration caused by dynamic compaction in the construction aredifferent with those in the horizontal surface of the general foundation, the safe distance ofvibration will also be affected.In this paper, using the indoor model test and finite element numerical simulation methodto study the above problems. the main contents are as follows:1. The improvement effect of dynamic compaction，aiming at filled soils，has beenstudied by ABAUQS which uses geometric nonlinear finite element method.And through theorthogonal analysis method, sensitivity analysis was carried out on the parameters to make thedynamic compaction safe,economic and effective.2. This article achieves the value of settlement, dynamic stress, velocity,displacement,and acceleration through model test and numerical simulation methods. Theinfluence of the distance between tamping points and the edge of slope on reinforcementeffect of dynamic compaction has been studied by analyzing the changes of the various physical quantities with the distance between tamping points and the edge of slope. Providereference for optimum arrangement of tamping points on the project.3. Through model test and numerical simulation method,the vibration attenuation low ofdynamic compaction in slope foundation is studied by analyzing the values of velocity andacceleration,and compared with general foundation, discuss the influences of slope onvibration attenuation law of dynamic compaction.4. The influence of different construction parameters on the vibration attenuationregularity has been studied by numerical simulation which considered different behaviorssuch as:different impact energies,different combinations in same impact energies anddifferent radius of rammer.hope to provide some beneficial reference for the optimization ofdynamic compaction.