The Bearing Characteristic Of Large Diameter Piles By Inner-digging Of Expanded-foot Method

PHC pipe pile has a lot of advantages,such as high bearing capability, shortconstruction period,the construction cost low, in recent years,Gradually,itbecomes the most common type of the foundation engineering design.But in theengineering practice, Because of the large diameter pipe pile stress mechanism andmethod of research is relatively weak, the popularization and application of largediameter prestressed pipe pile was significantly affected.research the pile byInner-digging of Expanded-foot Method,based on the traditional of the PHCpile piles.As a kind of embedded type pile,Although it has the high bearingcapacity,low vibration,no secondary pollution and other significantfeatures,However,Because of the lack of systematic theoretical research,andcurrently there is no pracitical application in domestic,The bearing mechanismand bearing behavior of the pile under compressing loads are not clear,So it isnecessary for the load-bearing characteristics,construction technology,economicand technical value of in-depth research and discussion.This arrticle introduces the characteristics and driving process of the Pileby Inner-digging of Expanded-foot Method. it is concluded that the test pile ofQ-s curve,axial force of the piles and the lateral resistance distributioncurve,based on research of the four large diameter pipe piles static laod test,itprovide experimental date for the analysis of load transfercharacteristics..According to the pile-soil parameters,using the finite elementsoftware ANSYS,Reasonable modeling for it, simulation of the load transferprocess and settlement under the vertical load,and the results were comparedwith experimental results. and put forward the estimate parameters of the singlepile vertical ultimate bearing capacity of the standard method.