Mechanism Of Vacuum Combined With Surcharge Preloading And Its Numerical Simulation

The vacuum combined with surcharge preloading is useful method in improving the soft soil foundation.In the recently years,the vacuum preloading and surcharge preloading has been widely used in engineering practice,but the research on the reinforcement mechanism still exist many problems to be solved.For example,its mechanism,its reinforced depth and the effect of underground water.In this paper,combined with the energy power station project in hengqin island,to analysis and research the vacuum combined with surcharge preloading.the research contents and results are as follows:1.This paper expounds the large deformation theory of U.L description and A.L.E description,and on this basis,obtained the large deformation consolidation of the control equation.Finally,by using an example proceed analysis for two description.And think that A.L.E large deformation can be better described for the caculation.2.By the ABAQUS soft,according to the Biot consolidation theory and modified cam clay model,to the vacuum preloading,the surcharge preloading and the vacuum combined with surcharge preloading proceeding simluted.And analysis their the calculation result,base on vacuum preloading and surcharge preloading,and get reinforcement mechanism of vacuum combined with surcharge preloading.Get some meaningful conclusions for engineering design and practice.3.According to the U.L description large deformation consolidation theory and modified cam clay model,to the vacuum preloading,the surcharge preloading and the vacuum combined with surcharge preloading proceeding simluted.For comparision result with basis on Biot consolidation theory,analysis the influence with large deformation to consolidation.The large deformation of high compressibility of the soil has a more significant impact on the conclusion.