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取陕北地区马兰黄土制成一系列干密度相同而含水率不同的重塑对比试验土样。用体积压力板仪测得土样的土-水特征曲线。利用自制的崩解试验仪器对不同初始基质吸力土样进行试验,得出平均崩解速度与初始基质吸力的关系曲线。试验结果表明,干燥黄土比湿润黄土更易发生崩解破坏,非饱和重塑黄土的初始基质吸力与平均崩解速度存在对数关系。基质吸力对非饱和重塑黄土崩解性的影响主要表现为两个方面:①基质吸力越大,水在土中的渗透速度越快,水快速入渗可提高土体内部孔隙水压力,同时溶解黄土颗粒间胶结物,使土体软化;②水快速占据土体内部孔隙,使土体内部气体以气泡形式挤出形成对外的压力。
Take a series of Malan loess in northern Shaanxi dry density and moisture content of the same reshape contrast test soil samples. Soil-water characteristic curves of soil samples were measured with a pressure platemeter. The self-made disintegration test apparatus was used to test the soil samples with different initial substrate suction, and the curves of the average disintegration rate and the initial substrate suction were obtained. The experimental results show that the dry loess is more prone to disintegration and destruction than the wet loess, and there is a logarithmic relationship between the initial matrix suction and the average disintegration rate of the unsaturated loess. The influence of substrate suction on disintegration of unsaturated remolded loess is mainly manifested in two aspects: ① The greater the substrate suction, the faster the penetration of water in the soil, and the quick infiltration of water can increase the pore water pressure in the soil, meanwhile, Dissolve the cement between the loess particles, so that the soil softens; ② water quickly occupy the soil pores, so that the internal gas bubbles in the form of external pressure.