膨胀土路基的胀缩变形模型试验

Model Test on Expansion and Shrinkage Deformation in Expansive Soil Roadbed

为了研究不同气候条件下膨胀土路基的胀缩变形规律,通过8组膨胀土路基模型试验,对广西南友路宁明地段中等膨胀土和湖南常张路慈利地段弱膨胀土,在压实度为90%和不同排水边界条件下,模拟路基分别处于积水、阴天、日照、降雨4种条件,研究膨胀土路基中各位置测点的胀缩变形大小及变化规律等,获得了这两种膨胀土路基的竖向和水平方向的胀缩变形量与变化规律。研究结果对膨胀土路基的设计和施工,保护路基、路面及路基中的构造物具有重要的理论和工程实际意义。

For studying on expansion and shrinkage rule in the expansive soils roadbed under different weather conditions, by eight groups model tests of expansive soil roadbed, whose soils came from Ningming section of Nanning-Youyiguan highway in Guangxi and Cili section of Changde-Zhangjiajie highway in Hunan, under 90% compaction condition and different dewatering boundaries, authors simulated accumulation water of on the top of roadbed, overcast sky, sunshine and precipitation. Authors studied the vertical and horizontal expansion and shrinkage character in the expansive soils roadbed and got measure data of the vertical and horizontal expansion and shrinkage of two expansive soils roadbeds. It is instructive for design and construction of expansive soils roadbed.