双向增强体复合地基桩土应力比三维分析  

Three dimensional analysis of pile-earth stress ratio of biaxial reinforcement composite foundation

作　　者：郑俊杰[1] 张军[1] 马强[1] 蒲诃夫[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）》2010年第2期83-86,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(50978112)

摘　　要：针对双向增强体加筋软土路基作用特点,分析了筋材-桩-桩间土在路堤荷载作用下荷载传递机理.将一定厚度水平向加筋垫层视为具有一定刚度的薄板,基于大挠度薄板理论模拟筋材的挠曲变形,将单桩处理范围内的复合地基作为典型单元体进行分析,推导出桩土应力比的计算式,给出了计算方法.采用相关文献中的试验结果对计算方法进行了验证,并与文献中的计算结果进行比较分析.结果表明:采用给出的方法计算出的桩土应力比与实测结果比较接近,说明该计算方法是合理的,可为工程实践提供理论参考.According to the characteristics of the earth subgrade reinforced by biaxial reinforcement,the interaction mechanism of geogrid,piles and earth under the embankment load was analyzed.When the horizontal reinforced mattress was modeled as a thin plate,the deformation was calculated by the thin plate theory.A rectangle consisted of a single pile and earth were investigated as the typical element.From the theory of large deformation,the function of pile-earth stress ratio was deduced.The method presented in this paper was validated by comparing the analytical solutions with the testing results.The results from the proposed method were compared with the calculation results in the reference.The results show that the analytical solutions have better agreement with the measuring data than those calculated values from the references.The method is applicable and it can be used in engineering practice.

关 键 词：复合地基 双向增强体 薄板理论 桩土应力比 软土路基 

分 类 号：TU473.1[建筑科学—结构工程]