双向增强体复合地基桩土应力比分析  

Pile-soil stress ratio of two-directed reinforcement composite foundations

作　　者：郑俊杰[1] 陈保国[1] Sari W.Abusharar 王仙芝[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2007年第7期110-113,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(50478090)

摘　　要：分析了双向增强体复合地基中筋材-桩-桩间土协同作用机理,利用圆弧线模拟筋材的挠曲变形,假设桩间土为理想弹塑性体,通过对筋材、桩体和桩间土进行力学分析,推导出了双向增强体复合地基桩土应力比的一种解析解和筋材挠曲变形的计算公式.结合算例和现场试验结果分析了桩土应力比和筋材挠曲变形的影响因素及其变化规律,算例分析结果说明该计算方法是合理的,可为工程实际提供理论参考.Studied was the behavior of two-directed reinforcement （TDR） composite foundation which is an interactive system consisting of the geosynthetics （geotextile, geomembrane, geonet, geogrid etc）, pile and soil. The formulas for calculating the geosynthetic deformation and the pile-soil stress ratio are proposed based on the arc-curve model, the equilibrium force of geosynthetic-pile-soil and hypothesis of elasto-plastic model of soil around piles. The factors affect geosynthetic deformation and pile-soil stress ratio was analyzed systemically, based on several numerical examples and field testing result. Results of show that the formulas proposed are feasible and reasonable, giving reference to designing TDR composite foundation.

关 键 词：双向增强体 加筋土单元 挠曲变形 桩土应力比 路堤荷载 

分 类 号：TU411.3[建筑科学—岩土工程]