A Study Of The Application Of Dynamic Compaction United With Wellpoint Dewatering In Disposing Soft Soil Foundation

With the rapid increase of the world’s population, good land resources which peoplecould use in their life are becoming increasingly scare. In this situation, sea reclamationand engineering constructions on soft soil foundation are still being the trend of thedevelopment of contemporary with the development of science and technology. As aresult of the particularity and complexity of soft soil foundation’s project status,focusing on this problem, people begin to do a higher level and a more comprehensiveresearch and creation on the treatment technology of the foundation. Recently, massesof new technologies, methods and theories are having been used for references andbrought in dealing with the problem which including the method of consolidation bydewatering, the method of vibro-densification and compacting, the method ofdisplacement and stir in, reinforcement method and etc. The method that dynamiccompaction united with WellPoint dewatering is being mentioned in the thesis has beenwidely used because it possesses the advantages of shorter in work time limit and betterin economic benefits.Previously when using the dynamic compaction to deal with the dredger fill andthe mucky soft soil, high energy dynamic compaction could make the excess pore waterpressure of the soil mass bigger in a short period. However, because the excess porewater pressure does not have a good drainage channel which makes the pressure dispelslowly, so the foundation always appears to be rubbery clay. In the thesis, the authortakes the example of the dealing fact of the dredger fill foundation project in theeconomic and technical development zone of Qingdao. Statistics are being made indealing with the soil mass’s horizontal and vertical deformation, the variation trend ofthe excess pore water pressure, the technical parameters of the construction technologyand the time effect of the soil mass’s mechanical property. The author also analyzed thereinforcement mechanism which fits the soft soil foundation’s situation and determinedto use the new method that the dynamic compaction united with WellPoint dewateringto speed up the soil mass’s solidification and the excess pore water pressure’s dispelling.In the last part of the thesis, a numerical simulation software FLAC-3D is being adoptedto calculate the data of the soil’s deformation and its stress distribution of the soft soilfoundation in the effect of the dynamic compaction. After being compared with the data of field test, the method the dynamic compaction united with WellPoint dewatering canbe proved possessing higher feasibility in dealing with soft soil foundation.