Numerical Simulation and Pile-soil Stress Ratio Test of the Composite Foundation in Handan Area
|School||Hebei University of Engineering|
|Keywords||composite foundation finite difference pile-soil stress ratio|
At present, the composite foundation of theory and engineering applications in geotechnical engineering is very popular, it has been a great development for the composite foundation technology. Because the different types of reinforcement in the composite foundation, there are some differences for the bearing behavior of the various types in the composite foundation. It has many factors in the composite foundation, theoretical study of the composite foundation is more difficult, it is lagging behind the engineering practice.The article describes the engineering properties of the composite foundation, researching, the basic concepts and working mechanism, and through a static load test in several representative projects to the CFG pile composite foundation and soil-cement deep mixing composite foundation, some earth pressure gauges were embedded through the pressure plates in pile top place between pile and soil, the pressure was measured during add lotus process in pile top and between the soil, calculated the composite foundation pile-soil stress ratio. According to the pilot projects, the model was established for the CFG pile composite foundation and soil-cement deep mixing composite foundation by the FLAC3D finite difference software, the pile, the contact of soil between piles and the cushion was considered, it has been known that the settlement, the pressure of the pile and the soil between the piles of the composite foundation under load by software, we can obtain the simulated values of pile-soil stress ratio in the CFG pile composite foundation and the soil-cement mixing pile composite foundation. Both the simulated values and the test date were analyzed, it was verified that the numerical simulation was rationalized, it provide a reasonable value of the pile-soil stress ratio for the corresponding site conditions in Handan area CFG pile composite foundation and soil-cement deep mixing pile composite foundation, and provide a reliable, objective design parameters for the design, it has significant meaning for the design experience accumulation in this area and the perfect design theory..