FORMULA OF PILE-SOIL STRESS RATIO IN PILE (SAND PILE)-NET (GEOGRID) COMPOSITE GROUND

摘要

Pile-net composite ground is a new method for ground improvement, which comprises both vertical piles and horizontal "net"— geosynthetic. In this kind of ground improvement method, net and piles as well as soil work together and perform compatibly, thus many advantages such as small settlement deformation, good stability and short construction period have been found in practical engineering and theoretical researches. And it has been concluded that the pile-soil stress ratio is an important parameter for design and research of pile-net composite ground, therefore based on the field research and measured data, combined with previous research, a calculation formula of pile-soil stress ratio in the pile-net composite ground, which is composed of sand piles and sand cushions reinforced with geogrid, was proposed with taking the effects of the reinforcement into account. And the comparison between calculated and observed field results showed this formula is applicable. In the later research, the interface friction coefficient (IFC) between reinforcements and soil should be considered in the formula to make it more perfect.