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基于混凝土和钢两种不同结构材料,构成土—混凝土和土—钢两种复合体,采用江苏沿海滩涂地区土体,通过改进直剪仪研究土与不同结构材料接触面的摩擦性能及其时效性,并对两种不同结构材料进行沥青涂层,研究沥青涂层对其摩擦性能的影响。试验结果表明,法向应力越大摩阻力越大,摩阻力与法向应力呈近似直线关系。一般情况下,土与混凝土和钢两种结构材料接触面的摩阻力比纯土要低,粉质粘土—钢接触面的摩阻力比粉质粘土—混凝土高,粉土—混凝土接触面的摩阻力高于粉土—钢的摩阻力。随着法向应力的增加,摩阻力降低幅值由负转正,且越来越大。粉质粘土与混凝土和钢两种结构材料接触面的摩阻力具有明显的时效性,而粉土与其结构材料接触面摩阻力的时效性不明显。沥青涂层对接触面摩擦性能也有一定的影响,法向应力较小时,沥青涂层会降低摩阻力,法向应力较大时,沥青涂层反而会增加摩阻力。接触面的摩擦性能与土的类型、法向应力、结构材料、沥青涂层等均受不同程度的影响。
Based on two kinds of different structural materials, concrete and steel, two kinds of soil-concrete and soil-steel composite bodies are formed. The soil in coastal tidal flat areas in Jiangsu Province is used to study the frictional properties and aging of the contact surfaces of soil and different structural materials The asphalt of two kinds of different structural materials was studied to study the influence of asphalt coating on its frictional properties. The experimental results show that the larger the normal stress is, the larger the frictional resistance is and the frictional resistance is approximately linear with the normal stress. In general, the frictional resistance between soil and concrete and steel is lower than pure soil, the frictional resistance of silty clay-steel interface is higher than that of silty clay-concrete, and the frictional force between silt-concrete interface Resistance is higher than silt - the friction of steel. With the increase of normal stress, the magnitude of frictional resistance decrease from negative to positive, and more and more. The frictional resistance of silty clay and the interface of concrete and steel has obvious timeliness, but the timeliness of the frictional resistance between silty clay and its structural material is not obvious. Asphalt coating also has certain influence on the frictional properties of the contact surface. When the normal stress is small, the asphalt coating will reduce the frictional resistance. When the normal stress is larger, the asphalt coating will increase the frictional resistance. The frictional properties of the contact surface and soil type, normal stress, structural materials, asphalt coating are subject to varying degrees.