Bearing Capacity Of Composite Foundation With Pile-soil Modulus

From the current situation of the development of composite foundation,many related engineering cases are dependent on the previous engineering experience,theoretical research is not enough.The factors affecting the bearing capacity of composite foundations are many factors such as the thickness and modulus of cushion,the ratio of pile-soil modulus,the ratio of length to diameter of pile,and the replacement ratio of the area will affect the deformation of composite foundation and pile-soil stress ratio coefficient.The main study of pile-soil modulus ratio and the ratio of the length to the diameter of the composite foundation bearing capacity.In this study,a combination of in situ experiments and numerical simulations was used mainly for the following work:(1)Select the representative CFG pile composite foundation in Handan area for static load test of single pile composite foundation,and get the load-settlement curve by analyzing the test data.(2)At the same time of static load test,the stress data were measured by embedding soil pressure box between pile and pile,and the data were analyzed.(3)Use the FLAC3 D simulation software to simulate the same project data.The simulation results are compared with the experimental data to verify the rationality of the simulation and experimental data.(4)In the study of pile-soil modulus ratio in composite foundation,the numerical simulation method is mainly used.The moduli of pile-soil are adjusted by changing the modulus of soil between pile and pile,then the effect of pile-soil modulus ratio on bearing capacity of composite foundation is analyzed.(5)In the research,it is found that the change of the aspect ratio of the pile will affect the size of the soil modulus of the pile.Therefore,in the process of numerical analysis,the change of bearing capacity of composite foundation under different aspect ratio of pile is further analyzed.The results show that the adjustment of the pile-soil modulus ratio and the length-diameter ratio of the pile body can effectively improve the bearing capacity of the composite foundation.With the increase of the pile-soil modulus ratio and the length-diameter ratio of the pile body,the pile-soil stress ratio also increases Big.Through this study,it provides the basis for future design of pile body strength and pile aspect ratio in composite foundation,and improves the related theory of composite foundation.