The Test And Application Research Of Load-Bearing Mechanics For Bearing Base Pile In Loess Area

Bearing base pile is compound carrier and reinforced concrete pile which is tamped dry concrete and plugging compound by slender hammer.The format of bearing base pile doesn't like caission pile, but is same as spread foundation. The stress of bearing base pile is definite. The time limit of a project is short, the fabrication cost is low, and the reliability is high also. The application foreground of bearing base pile is so extensive.The article takes test and theory research systematically for bearing base pile in xi'an loess ground about load-bearing mechanics and project application. The article analyses working mechanics and the augemented head of bearing base pile firstly. And then, it discusses the allowable pile bearing load of bearing base pile and the calculation method of settlement. Through site test, it analyses the bearing capacity of bearing base pile in loess ground, discusses the regular of the stress of pile, frictional resistance of the around of pile and the resistance pressure of the end of pile. It uses low strain back wave to detect the completeness of pile in fore and after of test. It gets that the sum of resistance pressure is 75% in limit load. It shows that the character of bearing load of bearing base pile is type of end support and friction.The bearing capacity of pile is mainly provided by the end of compound bearing base pile.In the base of experimental investigation, it studies on bearing capacity of pile and the completeness of pile through the project of NO2 teaching building of some college. If proper construction technology is adopted, and reliable supporting course of pile is selected, the bearing capacity of bearing base pile is high in loess ground. It can save fabrication cost about 30% compared with cassion pile and preload stress pipe pile. So it has good economic performance and good promotion value.