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本次研究以河西走廊典型粗颗粒硫酸盐渍土地基为对象,通过室内重塑土样的溶陷特性试验,揭示粗颗粒盐渍土渗透系数及溶滤变形系数两个指标的影响因素及影响规律。试验模拟了150k Pa压力下上述两个指标在“含盐量—孔隙比”坐标平面上变化的神经网络曲面及其在平面内投影的等高线图。试验结果表明:经过冻融循环之后,盐分对周围土颗粒起到胶结作用,试样渗透系数降低,抗渗性能提高;孔隙比范围在0.43~0.52之间时试样的溶滤变形系数最大;当荷载超过150k Pa时,应力对溶滤变形系数的影响较为显著,而荷载小于150k Pa时,含盐量是溶滤变形系数的主控因素。
In this study, the typical coarse-grained sulfate soil foundation in the Hexi Corridor was taken as the object. Through the test of the dissolution characteristics of indoor remolded soil samples, the influencing factors and influence of the two indexes of the coarse-grained saline soil permeability coefficient and the leaching-filtration deformation coefficient law. The test simulates the neural network surface with the above two indexes changing in the “salinity-porosity ratio” coordinate plane under the pressure of 150k Pa and the contour map projected in the plane. The results show that after the freeze-thaw cycle, the salt cementing the surrounding soil particles, the permeability coefficient of the sample decreases, and the impermeability can be improved. When the porosity ratio is between 0.43 and 0.52, the coefficient of dissolution and deformation of the sample is the largest. When the load exceeds 150k Pa, the stress has a significant effect on the deformation coefficient of the leaching filter. When the load is less than 150k Pa, the salt content is the main controlling factor of the leaching deformation coefficient.