The Study Of Saturated Dredger Soil In Guangzhou Nansha Port Based On Vacuum Pre-loading Consolidation And Numerical Simulation

Method of vacuum drainage preloading consolidation of soft soil foundation, a lotof research now, have the relevant specification published on the reinforcementmechanism and design calculation and the construction of vacuum drainagepreloading, but about the vacuum drainage preloading of foot-steps also continue tomove forward. Vacuum drainage pre scholars in order to find a more perfect methodof unremitting efforts. Vacuum drainage preloading method in the reinforcement ofsoft soil foundation and many problems need further research, such as the effect ofwater content factor and solutions such as vacuum drainage preloading process. Inview of this, this paper mainly through one of the content factors out of indoor modeltest of vacuum preloading method in the reinforcement process (plastic drainageboard packet filter) to study, study shows:(1)From the vacuum drainage preloading stress path, vacuum pre loading methodof disposable drainage pressure method is suitable for larger permeability coefficientof soil; soil classification of vacuum drainage preloading pressure method on thecoefficient of permeability of small (such as clay) more effective.(2) Classification of vacuum drainage preloading method in the reinforcement ofthe newly saturated dredger fill model test shows that the vacuum degree, with theincrease of depth decreases, with the same rules vacuum drainage pre and disposableloading pressure method.(3) According to the classification of vacuum drainage preloading method in thereinforcement of the newly saturated dredger fill water monitoring can be learnedusing nylon mesh100meshes as the drainage plate coated membranes obtained themaximum amount of water out in the model test. Load level of vacuum drainagepreloading step loading should be20KPa,40KPa,60KPa,80KPa. In this level load,should be able to make more soil drainage, and soil moisture content is low, afterstrengthening should be able to get more good reinforcement effect.(4) the indoor model test by classification vacuum drainage preloadingreinforcing recent saturated dredger fill, comprehensive analysis, using100meshnylon net as the reinforcement effect of plastic drainage plate coated membranereinforcement effect of plastic drainage plate coated membrane is better than using150purpose as the nylon net and200objective nylon net, so it is suggested to use100 mesh nylon net as the plastic drainage board packet filter in practical engineering.(5) the indoor model test by classification of vacuum preloading method, using anew type of drainage body (in the bag inside plastic drainage plates are inserted asvertical drainage channels) for reinforcement, the reinforcement effect is very good,can make the field test.(6) through the large-scale finite element software ABAQUS to simulate thevacuum drainage preloading consolidation of sand well foundation, according to thesimulation of sand well foundation of average degree of consolidation of sand wellfoundation and the dissipation of pore water pressure can be obtained, using100meshnylon net as the inclusion membrane average consolidation degree to the ground, andthe degree of consolidation the growth rate and the pore water pressure dissipationrate. Compared with the indoor model test has the same conclusion.