Comparison of Reinforcement Effect of Vacuum Preloading and Surcharge Preloading on Airfield Soft Foundation
Based on the foundation treatment test of the fourth extension in Pudong Airport,the vacu-um preloading and surcharge preloading tests of a large area of soft ground were carried out.Based on the variation law of ground surface settlement,stratified settlement,pore water pressure and horizon-tal displacement,the reinforcement effect of vacuum preloading and surcharge preloading on soft foun-dation was compared.The results show that both vacuum preloading and surcharge preloading have good effects on the reinforcement of the soft soil foundation of the airport.The surface settlement can reach about 1 000 mm,and the sedimentation value of the silt clay layer can reach about 30 cm.The pore water pressure changes greatly during the process of vacuuming and loading,and the pore water pressure remains in the clay layer after the end of preloading.The horizontal displacement of vacuum preloading is large,accounting for about 40%of the settlement.The soil outside the preloading area is prone to uplift,so the loading rate should be strictly controlled.
vacuum preloadingsurcharge preloadingfoundation reinforcementairportfield test
万方数据
维普
