Research on Vertical Bearing Capacity of Ram-compacted Pile with Vibrating Gravel Base in Collapsible Loess Foundation

Abstract

Abstract. Ram-compacted piles with vibrating gravel base is a simple method of foundation treatment which was applied to engineering in soft soil areas initially with which soil surrounding can be compacted by the impact of hammer transitted by gravel. Relatively low cost and ordinary construction technique have made it begin to take shape in general industrial and civil engineering. However, a mature frame of reference about the application of ram-compacted piles with vibrating gravel base in collapsible loess foundation especially vertical bearing capacity is still under research. This paper proposes a theoretical hypothesis of pile-soil model based on Mohr-Coulomb Model. The results of finite element analysis of ram-compacted piles with vibrating gravel base are used to verify that its vertical bearing capacity is up to standard generally while stress concentration on the uneven boundary of concrete and gravel base can not be ignored as well.