黄泛区粉性土路基基本特性与施工技术探讨

通过黄泛区土的粒径分布与颗粒成熟度试验,分析该区粉性土难以压实及压实的路基具有冻敏性和强烈的毛细作用的原因。通过土的毛细上升试验,给出粉性土路基过湿状态的临界高度。进行粉性土与粘性土的击实、粉性土的动力响应与大量现场压实工艺组合试验,分析该成因粉性土的压实性状与压实机理,提出粉性土最适宜的碾压工艺参数与碾压工艺及压实控制指标。为粉土路基病害处治技术、路基设计关键指标的选用、路基施工工艺与质量控制指标的确定,提供理论与试验依据。

Study on Fundamental Characteristics and Construction Techniques of Study Soil Subgrade in the Yellow River Flood Field

According to grain-size distribution and particle maturity test of soil,the specific engineering characteristics of silty soil subgrade in the Yellow River flood field were analyzed.The characteristics are frost susceptibility of compacted subgrade and intensive capillary action.The critical height of the overwet state of subgrade were analyzed and given according to the capillary lift test.Compaction tests on silty soil and cohesive soil,dynamic response of silty soil,and many combination tests of in-situ compaction techniques on cohesive soil were conducted.Then,on the basis of profound analysis of the compaction characteristics and mechanism of silty soil,the roller compaction techniques,the most suitable parameters and compaction control criteria were proposed.The study provides theoretical and experimental basis for damage treatment techniques,selection of key design indexes,construction techniques and quality control criteria for silty soil subgrade.