摘要
针对桩承式加筋路堤作用机理复杂的问题,分析路堤填土-筋材-桩-桩间土在路堤荷载作用下的荷载传递机理.根据位移、应力连续条件,将路堤填土和加固区作为统一的整体考虑.将一定厚度水平向的加筋垫层视为具有刚度的薄板,考虑土工格栅的加筋作用,采用大挠度薄板理论计算筋材的挠曲变形.考虑路堤填土的土拱效应和路基桩土相互作用,推导在桩体打穿和未打穿软土层2种情况下桩承式加筋路堤荷载分担比的求解方法.采用相关文献中的模型试验结果对提出的计算方法进行验证.结果表明,采用该方法计算出的桩土应力比与实测结果比较接近,可为工程实践提供设计理论参考.
The interaction mechanism of embankment fill, geogrid, pile and soil under the embankment load was analyzed, aimed at the complex characteristics of the soft soil subgrade reinforced by geosynthetic and pile. The embankment fill and improved area were treated as a whole with continuous displacement and stress. The horizontal reinforced mattress was modeled as a thin plate to consider the effect of geosynthetic. The deformation was calculated by the thin plate theory. Then the arching effect in embankment and the interaction of pile and soil were considered. The function of pile efficacy was deduced under the conditions that the soft ground is fully reinforced and partially reinforced. The method was validated by comparing with the test results in the literature. Results show that the analytical solutions agreed with the measured data, so the method is applicable in engineering practice.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2010年第10期1950-1954,共5页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(50978112)
教育部留学回国人员科研启动基金资助项目(20091341)
山西省交通科技攻关项目
关键词
桩承式加筋路堤
荷载分担比
薄板理论
软土路基
geosynthetic-reinforced and pile-supported embankment
pile efficacy
thin plate theory
soft subgrade
