论文部分内容阅读
为研究饱和黏土不同荷载下的渗透特性,利用改制的K_0固结仪进行逐级加载条件下的变水头渗透试验,考虑饱和黏性土的有效孔隙比概念,分析了逐级荷载条件下起始水头、有效孔隙比、渗透系数和有效渗透系数的变化规律。结果表明:原状土的起始水头变化可以分为快速增加和缓慢增加两个阶段;重塑土起始水头与总水头变化速率有一定关联;原状土样的有效孔隙随着固结压力的增加逐渐减小;重塑土无效孔隙比的变化规律类似于原状土;当土样的结构逐渐破坏,其结构差异性趋于一致,有效孔隙比大的土样,其有效渗透系数较大;黏性土的渗透系数不仅与土体结构相关,土样在固结过程中对应的初始孔隙比、有效孔隙比的变化规律、水头高度及水头高度变化速率也对其有重要影响。
In order to study the infiltration characteristics of saturated clay under different loadings, the seepage test of variable head under step loading was carried out by using modified K_0 consolidation instrument. Considering the concept of effective void ratio of saturated clay, Water head, effective void ratio, permeability coefficient and effective permeability coefficient. The results show that the initial head changes of undisturbed soil can be divided into two stages: rapid increase and slow increase; the initial head of remolded soil is related to the rate of change of total head; the effective porosity of undisturbed soil increases with the increase of consolidation pressure Gradually decreased. The law of void ratio of remolded soil was similar to that of undisturbed soil. When the structure of soil sample was gradually destroyed, the structural differences tended to be the same, and the effective permeability coefficient of soil sample with larger effective void ratio was larger. The permeability coefficient of the soil is not only related to the soil structure, but also the initial void ratio, the change law of the effective void ratio, the height of the head and the rate of change of head height in the consolidation process.