双向增强体复合地基桩土应力比计算  

CALCULATION FOR PILE-SOIL STRESS RATIO OF TWO-DIRECTION REINFORCED COMPOSITE FOUNDATION

作　　者：赵明华[1] 刘敦平[1] 张玲[1] 

机构地区：[1]湖南大学岩土工程研究所,长沙410082

出　　处：《工程力学》2009年第2期176-181,共6页Engineering Mechanics

基　　金：国家863计划项目(2006AA11Z104)

摘　　要：针对竖向增强体-水平增强体-桩间土的整体相互作用特点,将水平向加筋垫层视为具有一定刚度的板,竖向桩体及桩间土简化为刚度不同的弹簧系列。以单个竖向桩体影响范围内的复合地基作为典型单元体进行分析,基于Winkler弹性地基圆板理论推导出水平加筋体的挠曲函数表达式,导出双向增强体复合地基桩土应力比计算式。最后对某工程算例进行计算分析,对路堤荷载大小、工后沉降值、面积置换率、桩土刚度比进行了参数研究,并探讨了桩土应力比随其主要影响因素的变化规律,计算与实测结果吻合较好。According with characteristics of interactions of vertical piles, horizontal reinforced mattress and soil, the horizontal reinforced mattress was supposed to be a thin plate, while vertical piles and soils were simplified as spring series with different rigidities respectively. A cylinder composed of a single pile and soils located in its influence area were regarded as the typical element to analyze the two-direction reinforced composite foundation. A function of the horizontal reinforced mattress deflection was deduced based on a circular thin plate on Winkler foundation, and the formula of the pile-soil stress ratio of the composite foundation was also deduced. Finally, an example was given for calculation and analysis. The main influence factors including the embankment loads, residual settlement, area replacement ratio and stiffness ratio of pile and soil are considered systemically. The change rules of pile-soil stress ratio are also investigated. The analysis result shows the good agreement with the test result.

关 键 词：复合地基 圆形薄板 挠度 工后沉降 桩土应力比 

分 类 号：TU472[建筑科学—结构工程]