1.1黄河下游公路路基土的工程特性研究的目的、意义土层间夹杂着粘土层,构造呈现层状分布状态;压缩性大,孔隙率高,粘粒含量低,粒径分布相对均匀,地基沉降量大,地下水位高,这些都是黄河下游路基土的性质,而这些性质又在很大程度上决定了工程特性,具体表现为以下四点:一是结构受力不利,二是沉降量大,三是结合料稳定相对困难,四是压实困难。针对黄河下游路基土的土质特点,通过室内试验和计算分析,掌握工程路基土特性,确保了工程设计指标的合理性,设 1.1 Engineering Characteristics of Highway Subgrade Soil in the Lower Yellow River Purpose, significance Soil layers are interlaced with clay layers and show a layered distribution. Compressive properties are high, porosity is low, clay content is low, particle size distribution is relatively uniform, ground subsidence Large amount of water and high groundwater level are all the properties of the subgrade soils of the lower Yellow River. These properties, to a large extent, determine the engineering characteristics, which are manifested in the following four points: firstly, the structure is adversely affected by force and secondly, the settlement is large Third, the combination of materials is relatively stable, the fourth is compaction difficult. According to the soil characteristics of the subgrade soils of the lower Yellow River, the characteristics of subgrade soil are mastered through laboratory experiments and calculation and analysis, which ensures the rationality of engineering design indexes.