受静载和循环荷载作用的基础下加筋挡墙工作性能分析

发布时间：2018-05-29 15:52

本文选题：土力学 + 加筋挡土墙　；参考：《岩石力学与工程学报》2017年06期

【摘要】：基于受静载和循环荷载作用的基础下加筋挡墙模型试验,综合对比分析了基础位置、荷载大小、频率和循环次数等因素对加筋挡墙力学与变形性能的影响。试验结果表明:(1)以基础极限承载力为标准,确定基础最佳偏移距离为0.3H(墙高);(2)基础沉降和挡墙水平位移随荷载、频率和循环次数的增加而增加,当基础受静载且达到极限承载力前,沉降与墙高比均小于2%,挡墙水平位移与墙高比均小于1%;当基础受循环荷载时,增加循环荷载水平和频率使初始阶段基础沉降和挡墙水平位移增加明显,但随循环次数增加而变形收敛;(3)紧邻基础下方的筋材应变显著高于其他层,且循环荷载水平越高,循环次数增多时筋材应变增幅显著;(4)静载时挡墙破坏随基础偏移距离增加而由初始顶层面板被挤出,逐渐过渡到破坏面沿基础边缘并向挡墙深部发展的剪切破坏为主;当基础受循环荷载且频率较小时,顶层面板以挤出变形为主,增加荷载水平和频率,挡墙以中部面板挤出破坏为主。
[Abstract]:Based on the model test of reinforced retaining wall under static load and cyclic load, the effects of foundation position, load size, frequency and cycle times on the mechanical and deformation properties of reinforced retaining wall are compared and analyzed. The test results show that the settlement of foundation and horizontal displacement of retaining wall increase with the increase of load, frequency and cycle times, according to the ultimate bearing capacity of foundation, the optimum deviation distance of foundation is 0.3H, and the horizontal displacement of retaining wall is increased with the increase of load, frequency and cycle frequency. When the foundation is subjected to static load and reaches the ultimate bearing capacity, the ratio of settlement to wall height is less than 2, the horizontal displacement of retaining wall to wall height is less than 1, and when the foundation is subjected to cyclic load, the ratio of horizontal displacement to wall height is less than 1. With the increase of cyclic load level and frequency, the settlement of foundation and horizontal displacement of retaining wall increase obviously in the initial stage, but the deformation converges with the increase of cycle times. (2) the strain of steel bar adjacent to the foundation is significantly higher than that of other layers, and the level of cyclic load is higher than that of other layers. When the number of cycles increases, the strain increment of steel bar is significant (4) at static load, the failure of retaining wall is extruded from the initial top face to the shear failure along the edge of the foundation and to the deep part of the retaining wall with the increase of foundation offset distance. When the foundation is subjected to cyclic load and the frequency is small, the top floor slab is mainly extruded deformation, and the load level and frequency are increased.
【作者单位】：河北工业大学土木与交通学院;河北工业大学河北省土木工程技术研究中心;
【基金】：国家自然科学基金资助项目(50909032) 河北省自然科学基金资助项目(E2014202038)~~
【分类号】：TU476.4

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