路堤荷载下双向增强复合地基荷载分担比及沉降计算

发布时间：2018-02-15 15:38

本文关键词： 路堤荷载双向增强大挠度薄板沉降荷载分担比　出处：《岩土工程学报》2014年12期 　论文类型：期刊论文

【摘要】：针对路堤荷载下双向增强复合地基受力变形特性,以单桩有效影响范围内的路堤与复合地基为分析对象,引入大挠度环形薄板考虑加筋垫层的"柔性筏板效应"与"拉膜效应",同时通过假定桩土相对位移模式,考虑地基成层性,从而建立了路堤、水平加筋体、桩体、桩间土协调变形三维模型,获得了路堤荷载作用下双向增强复合地基的荷载分担比及沉降计算方法。采用某工程试验数据对该计算方法进行验证,同时分析了路堤高度、桩帽宽度、筋材抗拉模量对中性点位置、桩土差异沉降以及复合薄板中面最大拉应力的影响,结果表明该方法所求得的荷载分担比及沉降与实测值较为接近,证明了其合理性。
[Abstract]:Aiming at the mechanical and deformation characteristics of bi-directional reinforced composite foundation under embankment load, the embankment and composite foundation under the effective influence of single pile are taken as the analysis object. The large deflection annular thin plate is introduced to consider the "flexible raft effect" and "membrane pulling effect" of reinforced cushion. By assuming the relative displacement model of pile and soil and considering the stratification of foundation, the embankment, horizontal reinforced body and pile body are established. The load sharing ratio and settlement calculation method of bi-directional reinforced composite foundation under embankment load are obtained by using a three-dimensional model of soil coordinated deformation between piles. The calculation method is verified by the experimental data of a certain project, and the height of embankment is analyzed at the same time. The influence of the width of pile cap, tensile modulus of steel bar on the position of neutral point, the differential settlement of pile and soil and the maximum tensile stress in the middle plane of composite thin plate are discussed. The results show that the load-sharing ratio and settlement obtained by this method are close to the measured value, which proves its rationality.
【作者单位】：湖南大学岩土工程研究所;
【基金】：国家自然科学基金项目(51078138)
【分类号】：U213.1;U416.1

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