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以合肥重塑膨胀土为研究对象,采用改进的三向胀缩仪开展了16组不同初始含水率与干密度的三向膨胀力试验。研究结果表明,(1)在所研究的含水率、干密度范围内竖向膨胀力总是大于横向膨胀力,快速膨胀阶段大致在0~2 h以内,该阶段竖向膨胀力可达到极限膨胀力的80%以上;(2)同一干密度下竖向膨胀力随初始含水率增大而减小,竖向膨胀力与初始含水率之间具有良好的线性关系,且干密度越大,竖向膨胀力随着初始含水率的变化速率越大;(3)在竖向膨胀力与干密度的关系图中,每条曲线均以干密度1.6 g/cm~3为分界点呈双线性关系;(4)由膨胀力对数与初始干密度的关系,不同初始含水率下的ln(P_z)-ρ_d关系为一系列近似平行的递增直线,直线斜率大致相同,说明膨胀力随初始干密度的变化速度不随含水率的变化而变化。
Taking Hefei remolded expansive soil as the research object, 16 sets of three-direction expansive force tests with different initial moisture content and dry density were carried out with an improved three-dimensional expansion and contraction instrument. The results show that: (1) The vertical expansive force is always greater than the horizontal expansive force in the range of moisture content and dry density, and the rapid expansive stage is within about 0 ~ 2 h. The vertical expansive force reaches the limit expansive stage (2) Under the same dry density, the vertical expansive force decreases with the increase of the initial water content, and there is a good linear relationship between the vertical expansive force and the initial water content, and the greater the dry density, the more vertical (3) In the graph of vertical expansive force and dry density, each curve is bilinear with the dry density of 1.6 g / cm ~ 3 as the cut-off point (4) According to the relationship between logarithm of initial expansive force and initial dry density, the relationship of ln (P_z) -ρ_d under different initial moisture content is a series of increasing parallel lines with almost the same slope, indicating that the expansive force varies with the initial dry The rate of change of density does not change with the change of water content.