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Combination of vacuum preloading and surcharge preloading method, which is widely used in engineering, is one of the effective methods for reinforcement soft clayfoundation. However, this method’s study in theory gets behind in practice, especiallyit’s shear strength and stability analysis theory need to be developed to guide practice. It is important to deeply analysis this method’s reinforcement mechanism and designtheory for calculating the soil’s shear strength and stability.In this paper, it took the project of shan dong province rizhao port for example,Firstly, I finished the trial monitoring date,then analysis their change in law. Throngh deeply study of reinforcement mechanism, the characteristic that soil is consolidated by isotropic consolidation pressure in the preceeding of vacuum and the formula of calculating Circle. Secondly, this method’s shear sthength has preloading has been recommended been educed through Mohr Stress phase properties has been pointed out by discussing reinforcement mechanism. At the begining of vacuum, shear strength and stability increase and foundation cann’t miss stability, so biggish loading can be bringed to bear. Simultaneity, the negative excess pore water pressure due to vacuum can partially counteracrt to the pore water pressure due to stack, so exorbitant excess pore water pressure cann’t come into being while soft clay is stacked rapidly. All of these is in favor of stability. In this paper, It took the project for example, thoughly used the trial data ,it used the GEO-SLOPE Control the stability for calculation, and forcasted the shear strength in the orignal basis keeping load , also used the theory calculation the allow carrying capacity. In the end ,in this paper ,throngh study the reinforcement effective of combination of vacuum preloading and surcharge, that some advice in the implementation project.
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