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为了研究返包式土工格栅加筋土挡墙在墙顶荷载作用下的受力和变形状态,分析其作用机制,通过室内模型试验,进行包括加筋土墙体垂直和水平土压力、应力扩散角、侧土压力系数、墙面水平变形和竖向沉降及土工格栅拉伸应变等分布规律的研究。试验结果表明:加筋土挡墙内垂直土压力沿筋材长度方向呈非线性分布,最大值位置从加载前位于筋材中部附近逐渐移动到加载点下;靠近墙面位置侧土压力沿墙高逐渐从加载前与自重应力线性相关变化为加载后从高到低逐渐减小的分布规律,其值小于主动土压力;实测应力扩散角较非加筋土体大,稳定的应力扩散角约为50°;侧土压力系数与荷载大小成正比,其沿墙高分布规律与水平土压力相似;墙面累积水平位移沿墙高呈“S”形曲线分布,最大值位于中下部;筋材应变沿其长度方向呈单峰值和双峰值的分布,峰值出现位置距墙脚的水平距离从高到低逐渐减小。
In order to study the stress and deformation state of the return-type geogrid reinforced retaining wall under the action of wall top load, the mechanism of action is analyzed. Through the indoor model test, the vertical and horizontal earth pressure, stress Diffusion angle, lateral earth pressure coefficient, wall horizontal deformation and vertical settlement and geogrid tensile strain distribution law. The test results show that the vertical earth pressure in the reinforced earth retaining wall shows a non-linear distribution along the length of the reinforcement. The maximum position gradually moves below the loading point near the middle of the reinforcement to the loading point. The earth pressure along the wall The height gradually decreases from the linear correlation of self-weight stress before loading to the distribution law of decreasing from high to low after loading, which is less than active earth pressure. The measured stress diffusion angle is larger than that of non-reinforced soil, and the stable stress diffusion angle is about The lateral pressure coefficient is proportional to the load size. The distribution along the wall is similar to the horizontal earth pressure. The cumulative horizontal displacement of the wall is distributed along the height of the wall with the curve of “S” shape with the maximum at the middle and lower part. The strain of tendons distributed single peak and bimodal along its length, and the horizontal distance from the peak to the wall foot gradually decreased from high to low.