高等级公路工程中的膨胀土研究

Study on Expansive Soil in Motorway

结合宁—连一级公路相应试验资料，对路基膨胀土进行工程地质研究，认为塑性图是判别、划分膨胀土胀缩等级的可靠手段；路基土经击实后胀缩性有明显提高，施工应采用重型击实标准；掺６％～８％生石灰是膨胀土的理想改良措施，中、弱膨胀土经改性处理后可作为高等级公路的路基填料。

Expansive soil does serious harm to the costruction and quality of motorways.On the basis of laboratory experiments of the Ning Lian highway,the engineering geology of expansive soil in motorways is studied.It is considered that the plasticity chart is a simple,accurate and feasible method for distinguishing expansive soil and determining the swelling shrinkage grades of expansive soil.The compacted expansive soil is much greater in swelling shrinkage side than the undisturbed expansive soil. Also, the behaviour of expansive soil can be improved if 6%～8% of lime is added.