The Numerical Study On The Influence Factors Of The CFG Pile Composite Foundation Bearing Capacity And Deformation.

With the theory of composite foundation gradually maturity. the CFG (cement-flyash-gravel) pile reinforcement forms the CFG pile composite foundation have a very big market in the north of China, particularly in Beijing and surrounding areas. So the CFG pile composite foundation settlement and the bearing capacity influencing factor's research, has the theory and the practice significance.CFG pile composite foundation consists of three parts: piles, piles of soil, the cushion. The pile and the foundation to achieve the coordination of the foundation through the bedding cushion. At present the people had certain understanding to the cushion action mechanism, but the cushion of theoretical study lacks, in particular the design of composite foundation cushion basically is depending on the experience.Early CFG pile compound ground's design calculation method is the CFG pile compound foundation character research obtains to the rigid foundation . Along with CFG pile compound ground technology in first-class highway construction application.People will be found under the rigid foundation of the foundation bearing capacity and settlement calculation method applied to fill embankment's compound ground bearing capacity and settlement calculations. Obtains the predicted value and the actual value difference are big, moreover is unsafe. For the above problems,the research has the following three aspects:â‘ .Study the basic theory of numerical simulation,algorithms and analysis process, learning how to use FLAC software to achieve the establishment of model simulation.â‘¡.Based on the actual engineering background use numerical software of FLAC3D study cushion material and thickness on the influence of the CFG pile foundation bearing capacity, settlement, pile-soil stress ratio and compares with the actual project..â‘¢.With physical model testing, numerical software of the FLAC2D,are used to investigate the influence of foundation stiffness on the CFG pile foundation bearing capacity, settlement, pile-soil stress ratio and compares with the actual project..