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。
It is necessary to study the settlement laws,earth pressure distribution and bearing failure modes of the high-filled soil-rock-mixture roadbed,as well as the impact of rainfall. Based on the similar ratio theory,two groups of soil-rock-mixture roadbed models are conducted in a special model tank with the same criteria and the models are embedded within the earth pressure cells and displacement strips to record soil pressure and deformation of the models at different positions. The graded load is respectively applied until failure occurs under normal conditions and sprinkler immersion models. The results show that under normal conditions the model of soil-rock-mixture roadbed shows a better structure. Before reaching its ultimate load,p-s curve is nearly linear with sudden destruction,and the failure surface is not a traditional circular slip surface. Water has a very significant impact on its settlement,the size of the bearing capacity and the failure mode.Simultaneously,there is a no-constraints slope in the side of the soil-rock-mixture foundation model,with a larger load the asymmetric stress diffusion and depth of affected soil will be apparent between the opposite sites of the load plate.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2014年第4期62-67,共6页
Hydrogeology & Engineering Geology
基金
国家自然科学基金(51078137)
关键词
土石混填体
高填路基
降雨浸泡
P-S曲线
破坏模式
soil-rock aggregate mixture
high-filled roadbed
rain-fall soaked
p-s curve
failure mode
