The Numerical Simulation Research Of Penetration And Static Load Test To Jacked Pile

In recent years, with the rapid development of city infrastructure, high buildings are increasing and intensive, the pile foundation is becoming main form of high building. People attach importance to jacked pile because of it's merit of little quiver, loud noise and good to environment. The jacked piles are widely used in southeast of china and big cities, and make good effect. It is a potential development technology.The compacting effects caused by static piling in saturated soft clay ground would bring severe negative influence to the construction environment including soils around the driven piles, the nearby building and so on. In the early 195O's,the studying of this problem was started. Today, the problem is still a researching hotpot. The problem is very complicated because a lot of basic problems are involved. Although different methods have been adopted by many researchers, no satisfactory results have been obtained until today. Numerical analysis of static piling based on the commonly used software ANSYS is done. The displacement penetration method is presented, which lets the pile move downward by means of the displacement boundary condition so that to simulate the piling process of jacked pile. The method takes some complex problems into account, such as elastoplastic constitutive law, large deformation and the sliding friction between pile and soil, which is more reality and obtain soil horizontal displacement and stress, compared with the date from prototype test, there some useful conclusions to be drew.The FLAC software base on fast lagrangian analysis of continua provide new way to analysis the pile and soil work together. In this paper, the interface element is used and program is compiled in FISH language in FLAC software, the axial and lateral load-deflection are obtained by applying vertical and horizontal load which is increased linearly from zero to the desired value at the top of the pile. The result is reasonable compared with the prototype test date. On the other way, the pile driving is simulated by applying force at the top of the pile and the result of horizontal stress is consistent to ANSYS calculated. It shows that the numerical simulation to jacked pile by finite element and fast lagrangian finite difference is effective. FLAC is better thanANSYS in nonlinear calculate and convergence.