不同水环境下土石混填路基稳定性的模型试验研究

发布时间：2018-10-14 10:26

【摘要】：为了更加深入研究土石混填高填路基的沉降变形规律、土压力分布特征和承载破坏模式,以及降雨浸水对其有何影响,首先,基于相似比理论,在特制的地槽内按照相同的标准制作了2组土石混填路基模型,并在模型内部分层埋设土压力盒与位移标,以记录路基模型内不同位置的土压力和变形量;然后,分别在正常条件和洒水浸泡环境下对2组路基模型进行分级加载,直至发生破坏。试验结果表明:正常条件下土石混填路基模型可表现出较好的结构性,在达到极限荷载之前其p-s曲线近似呈线性发展,破坏具有突发性,且破坏面并非传统的圆弧滑动面;而水的存在对其沉降变形、承载力大小和破坏模式均有着非常显著的影响。同时,由于土石混填路基模型的坡面处于临空状态,当荷载比较大时加载板两侧会出现比较明显的应力扩散和影响深度不对称的情况。
[Abstract]:In order to study the law of settlement and deformation, the distribution characteristics of earth pressure, the failure mode of bearing capacity, and the influence of rainfall flooding on the subgrade, firstly, based on the theory of similarity ratio, According to the same standard, two groups of embankment models are made in the special geosyncline, and the earth pressure box and displacement scale are embedded in the model to record the earth pressure and deformation at different positions in the subgrade model. Two groups of subgrade models were subjected to subgrade loading under normal condition and sprinkling environment, until failure occurred. The test results show that the soil and rock mixed subgrade model can exhibit better structure under normal conditions. The p-s curve develops linearly before the ultimate load is reached, the failure is sudden, and the failure surface is not the traditional arc sliding surface. The existence of water has a significant effect on the settlement deformation, bearing capacity and failure mode. At the same time because the slope of the soil-rock embankment model is in the condition of being empty the stress diffusion and the asymmetry of the influence depth will appear on both sides of the plate when the load is large.
【作者单位】：湖南大学土木工程学院;长沙理工大学土木与建筑学院;
【基金】：国家自然科学基金(51078137)
【分类号】：U416.1

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