衡重式加筋土路肩挡墙土工离心模型试验研究

发布时间：2018-03-16 06:42

本文选题：衡重式路肩墙　切入点：土工离心模型试验　出处：《岩土工程学报》2014年03期 　论文类型：期刊论文

【摘要】：以某山区公路旧路拓宽改造工程中新建的衡重式加筋土路肩挡土墙为原型,设计了4组模拟墙体实际位移形态的土工离心模型试验,讨论了墙后土体压实度和土中加筋对墙背土压力和路基填土变形的影响规律。试验表明:①墙后土体加筋对减小墙背承受的土压力作用随填土压实度的提高而趋于明显,主要影响区域位于上墙背的下半部分,压实度由88%增至95%会引起上墙背土压力分布由近似线性增大演化为折线型变化;②衡重台对其上覆填土存在托举效应,致使下墙背的土压力大幅减小,其影响范围约为衡重台以下约1/3下墙高度;③墙后土体加筋能提高路基填土的抗变形能力,减小因墙体侧向位移引起的填土表面下沉,对降低新旧路基间的不均匀变形效果显著。
[Abstract]:Based on the new shoulder retaining wall of a mountainous highway in the old road widening and rebuilding project, four groups of geotechnical centrifuge model tests were designed to simulate the actual displacement of the wall. The effect of soil compaction behind wall and reinforcement in soil on the soil pressure and subgrade fill deformation behind wall is discussed. The test results show that the effect of soil reinforcement on reducing the earth pressure on the back of wall tends to be obvious with the increase of soil compaction. The main influence area is located in the lower half of the upper wall back. The increase of compaction degree from 88% to 95% will cause the distribution of earth pressure on the back of the upper wall to increase from approximately linear increase to the change of the broken line type. As a result, the earth pressure on the back of the lower wall is greatly reduced, and its influence range is that the reinforcement of the soil behind the 1/3 lower wall height can improve the anti-deformation ability of the subgrade fill, and reduce the settlement of the fill surface caused by the lateral displacement of the wall. It can reduce the uneven deformation between new and old roadbed.
【作者单位】：西南交通大学土木工程学院;西南交通大学高速铁路线路工程教育部重点实验室;
【基金】：973计划课题(2013CB036204) 中央高校基本科研业务费专项资金资助项目(2682013ZT12)
【分类号】：U417.11

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