重复荷载作用下土工格栅包生态袋加筋土挡墙动力特性试验研究

发布时间：2019-02-14 19:12

【摘要】：设计并制作了土工格栅包生态袋加筋土模型挡墙,测试了模型挡墙在不同幅值、不同频率重复交通荷载作用下的加速度、动土压力、累积变形和土工格栅拉应变,获得了挡墙在重复交通荷载作用下的动力特性和累积变形发展规律。研究表明:在交通重复荷载作用下,土工格栅包生态袋加筋挡墙顶层的加速度响应最大,沿墙高按指数模型衰减,且水平加速度衰减较竖向加速度快;挡墙内的动土压力也是在顶层最大,随墙高降低而减小;挡墙的变形和土工格栅拉应变增量在加载初期较大,随加载次数的增加而增大,受荷载幅值的影响明显,受频率变化的影响较小;竖向累积变形主要来自挡墙上部土体的沉降;水平累积变形总体上为上部大下部小。
[Abstract]:A geogrid bag reinforced soil model retaining wall was designed and made. The acceleration, dynamic earth pressure, cumulative deformation and geogrid strain of the model retaining wall under repeated traffic loads with different amplitudes and frequencies were measured. The dynamic characteristics of retaining wall under repeated traffic load and the law of cumulative deformation development are obtained. The results show that the acceleration response of the geogrid eco-bag reinforced retaining wall is the largest under the action of repeated traffic load, and the horizontal acceleration attenuation is faster than the vertical acceleration along the wall height according to the exponential model. The dynamic earth pressure in the retaining wall is also the largest in the top layer, which decreases with the decrease of the wall height. The deformation of retaining wall and the strain increment of geogrid tensile strain are larger at the initial stage of loading and increase with the increase of loading times, which are obviously affected by the amplitude of load and less by the change of frequency, and the vertical cumulative deformation mainly comes from the settlement of the soil in the upper part of the retaining wall. The horizontal cumulative deformation is generally large and low in the upper part.
【作者单位】：湖南科技大学土木工程学院;
【基金】：国家自然科金学基金项目(51208195) 浙江省交通科技项目(2013H27-4) 湖南省教育厅科研项目(13C311) 湖南科技大学博士科研启动基金(E51360)
【分类号】：TU435;TU476.4

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