Rigid Pile Composite Foundation Bearing Capacity And Deformation Mechanism

Composite foundation with CFG piles developed from the later of 1980s' is a technique of composite foundation with rigid piles. It has been wildly used in large quantity of construction for its high ratio piles bearing capacity, notable improvement in bearing capacity of subsoil, adjustable, lower construction cost (compared with pile foundation engineering) and wildly application(used in many kinds of regional soil such as soft soil> loess, expansive soil etc. and in multi-storey-, sub-high-rise buildings). Thus much construction experience in collapsible soft soil is accumulated. In other areas, however, a little experiment and research about its bearing behavior and working mechanism have been done.The paper is concentrate on bearing behavior and working mechanism of composite foundation with rigid piles by experimental research> theoretical analysis and related discussion according to data of static loading test and settlement observation for composite foundation with rigid piles in practice engineering.The paper include: concluding the factors affecting the vertical bearing capacity and deformation of composite foundation with CFG piles through theoretical analysis; discussing the calculating formula of vertical bearing capacity given by the code.; analyzing the composite foundation bearing capacity reduction coefficient of soil among piles by data gathering from practice engineering; providing some advice and a regional experimental extent of selecting the bearing capacity reduction coefficient of soil among piles for designing composite foundation with CFG piles in loess area according to investigating results, with which give the designer a material to consult.