摘要
针对现有桩土应力比计算方法存在的局限性与不足,研究了基于桩土相互作用机理的散体材料桩复合地基应力应变关系,并在考虑桩、土体孔隙率随加载而不断变化的基础上,建立了面积置换率与桩、土体变形模量及泊松比的确定方法.引进分级加载和分层计算的思想,建立了散体材料桩复合地基桩土应力比计算新方法.该方法适用于不同布桩方式下桩土应力比的求解,且能够反映桩、土体变形模量和面积置换率随加载而不断变化的特点.工程实例计算与分析并与其他计算方法比较表明了该方法的合理性与可行性.
According to the limitations and deficiencies of the existing methods to calculate pile-soil stress, the relationship between the stress and the strain of composite foundation with friable material piles was proposed. Then, considering the void ratio varying with load above the foundation, the methods to determinate area replacement ratio, deformation modulus and Poisson＇ ratio were presented. Afterwards, a new method of stratified calculation and multi-stage loading was introduced. A new method to calculate the pile-soil stress ratio of composite foundation with friable material piles was proposed. The effect of the variation of the load on area replacement ratio and deformation modulus in different depth was considered. Finally, the computation and analysis with practical engineering and comparison with other methods show that the method proposed is both feasible and reasonable, and it can also be suitable for calculating the pile-soil stress ratio of composite foundation with different pile arrangements.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第7期1-5,共5页
Journal of Hunan University:Natural Sciences
基金
国家863计划资助项目(2006AA11Z104)
湖南省自然科学基金资助项目(03JJY5024)
关键词
散体材料桩
复合地基
桩土应力比
模量
孔隙率
friable material pile
composite foundation
pile-soil stress ratio
modulus
void ratio
