基于现场试验的刚-柔性基础下膨胀土变形特性研究

发布时间：2018-05-02 22:54

本文选题：膨胀土地基 + 刚性基础　；参考：《铁道学报》2017年08期

【摘要】：为研究膨胀土地基的膨胀变形响应规律,结合云桂客运专线建设,在弥勒中-强膨胀土区域选取典型工点,开展刚性基础(多压板荷载)与柔性基础(低路基)下膨胀土地基现场浸水试验,对比分析浸水后刚性和柔性基础下膨胀土地基的膨胀变形差异。试验结果表明:在较小荷载下,刚性基础与柔性基础下地基均产生明显的膨胀变形,膨胀变形量与上部荷载近似呈双曲线关系,前者的极限膨胀量约为后者的85%。对云桂客运专线试验段路基的长期监测试验表明:在自然条件下,路基较低时,地基相对膨胀量变化值随路基高度的增加而减小;路基高度超过5m时,其相对膨胀量变化值趋近于0,自然降雨对超过该填高的中-高路基下膨胀土地基的膨胀变形几乎无影响。
[Abstract]:In order to study the response law of swelling deformation of expansive soil foundation, combined with the construction of Yunnan-Gui passenger dedicated line, typical work points were selected in the area of medium-strong expansive soil in Maitreya. Field soaking test of expansive soil foundation under rigid foundation (multi-pressure plate load) and flexible foundation (low subgrade) was carried out, and the difference of expansion deformation between rigid foundation and flexible foundation was analyzed. The experimental results show that the expansion deformation of both rigid foundation and flexible foundation is obvious under small load, and the expansion deformation is approximately hyperbolic with the upper load, and the limit expansion of the former is about 85% of the latter. The long-term monitoring test on the roadbed of Yun-Gui passenger dedicated Line shows that under the natural condition, the variation value of the relative expansion of the subgrade decreases with the increase of the height of the roadbed, and when the height of the roadbed is more than 5m, The relative expansion value is approaching zero, and the natural rainfall has little effect on the swelling deformation of the expansive soil foundation under the medium to high embankment.
【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试验室;中国中铁二院工程集团有限责任公司;
【分类号】：TU443

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