摘要
CFG桩复合地基是刚性桩复合地基,属于地基范畴;复合桩基是桩基,属于基础范畴。CFG桩复合地基中单桩承载力大于自由单桩承载力,复合地基桩间土承载力一般情况下大于天然地基承载力。复合地基承载力特征值应通过现场复合地基载荷试验确定,试验方案要合理模拟工程实际条件。利用公式估算复合地基承载力特征值时要合理选择Ra、fsk、β的取值。公式计算结果一般不大于载荷试验结果。CFG桩复合地基载荷试验中,褥垫层厚度取150mm,褥垫层周围预留原状土约束形成侧限条件。
CFG pile composite foundation is a type of rigid subgrade, whereas composite pile foundation is a type of foundation. The bearing capacity of one single pile in a CFG pile composite foudation is higher than that of a free single pile, and the bearing capacity of soil surrounding the CFG piles is commonly higher than that of natural soil. The characteristic bearing capacity of a composite foundation should be confirmed by field bearing test, that can simulate realistic engineering condition, and rational values of Ra, f^k and p should be employed to estimate bearing capacity of a composite foundation. The formula calculation is in general smaller than that of loading test. In a bearing test of a CFG pile composite foundation, the thickness of the cushioning layer is taken as 150mm, and the preserved surrounding soil forms a laterally constrained condition.
出处
《土木工程学报》
EI
CSCD
北大核心
2005年第7期87-91,共5页
China Civil Engineering Journal
关键词
CFG桩
复合地基
承载力
CFG pile
composite foundation
bearing capacity
