Indoor Experiment On Reclaimed Silt Foundation Reinforced By Vacunn Combined With Surcharge Preloading

Through artificial reclaimed tidal flats silt reclamation epeirogenic can effectively solve the problem of shortage of land resources,vacuum preloading and vacuum preloading combined heap load method,as a kind of more effective treatment method of reclaimed soil,has been widely used in engineering.Although the traditional vacuum preloading technique in the mechanism research,construction technology,the respect such as design theory has made great progress,but its reinforcement effect is poorer,still after reinforcement soil cannot meet the requirements of the actual bearing capacity of foundation,needing further improvement and technology innovation to achieve the goal of rapid reclamation silt foundation reinforcement.In this paper,on the basis of predecessors' work,through the indoor test and related theoretical research,the strengthening effect of vacuum combined pile load preloading with several reinforcement theory is discussed.(1)By the relevant test,the wenzhou longwan district beaten to fly engineering reclamation silt soil forming the physical mechanics indexes were analyzed,for land reclamation silt soil foundation reinforcement design basis and theoretical reference.(2)According to the test and monitoring data analysis of reclaimed land form and deep settlement,the variation of pore pressure and physical and mechanical properties of soil,evaluation analysis of the different degree of consolidation to enclose tideland for cultivation area reclaimed soil second-round exam the strengthening effect of vacuum preloading combined heap load,vacuum preloading joint stack technique is verified the effectiveness of the reclaimed soil foundation reinforcement in wenzhou area(3)By tidal flats reclamation soil to give expulsion-typely vacuum preloading compared with sealed vacuum preloading indoor model test research,and analyze the vacuum degree of reclaimed tidal flats silt soil of both the transmission and distribution,(4)Foundation settlement and pore water pressure,moisture content and vane shear strength changing with the time and depth,finally draw a closed vacuum preloading technology is the best,for the application and development of closed vacuum preloading theory.(5)Through pile of vacuum joint preloading method for reinforcement effect factors research,concluded that made use of second-round exam joint vacuum stack preloading method to achieve the ideal effect.