Mechanism Analysis of Vacuum Combined with Surcharge Preloading and Engineering Application in Highway

Abstract

Vacuum combined with surcharge preloading has been widely used in China recent years. However, the mechanism of vacuum combined with surcharge preloading method is still not clear. This paper expounds the mechanism of vacuum combined with surcharge preloading. Engineering application technology in highway including design method and filling processing of roadbed are also explained. Ground settlement, stratified settlement, pore water pressure and deep horizontal displacement monitoring can reflect the stress and strain of the foundation. Results of deformation monitor is very important to guide the filling speed of roadbed. The bearing capacity of foundation are improved after the action of vacuum combined with surcharge preloading. Engineering applications results show that vacuum combined with surcharge preloading method has achieved good benefits in the treatment on soft foundation in highway.