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为研究高庙子钠基膨润土GMZ001的三向膨胀力特性,改进了三向胀缩仪,扩大了该仪器膨胀力的测量范围,进行了一系列不同干密度和不同初始吸力的三向膨胀力试验。研究结果表明:①在所研究的干密度、含水率范围内,竖向(平行于压实方向)膨胀力、水平(垂直于压实方向)膨胀力均主要与干密度有关,初始吸力对其没有明显影响。②水平膨胀力与竖向膨胀力之比随干密度的增大而减小;当干密度较小时,竖向膨胀力与水平膨胀力基本相等;当干密度大于1.6 g/cm3时,水平膨胀力与竖向膨胀力之比变化很小,其值稳定在0.78左右。③初始吸力、干密度均会显著影响膨胀力随时间变化曲线的形状;对于高吸力高干密度试样,其膨胀力–时间关系曲线在中间一段出现“平台”。④相同初始吸力下,膨胀力变化速率随干密度的增大有所增加,但不同干密度试样的膨胀力变化速率的差异随时间逐渐缩小;相同干密度下,尽管初始阶段高吸力试样的膨胀力发展更快,但一段时间后低吸力试样的膨胀力变化速率会比高吸力试样的大。⑤膨胀力最终平衡时间随干密度增大有所增加,而初始吸力对平衡时间影响不大。
In order to study the three-dimensional expansive force of GMZ001 in Gaomiaozi-based bentonite, the three-direction expansion and contraction instrument was improved, the measuring range of expansion force of the instrument was enlarged, and a series of three-direction expansion force with different dry density and different initial suction force test. The results show that: ① In the range of dry density and moisture content studied, the expansive force in the vertical direction (parallel to the compaction direction) and the horizontal (perpendicular to the compaction direction) are mainly related to the dry density. The initial suction No significant effect. ② The ratio of horizontal expansive force and vertical expansive force decreases with the increase of dry density. When the dry density is small, the vertical expansive force is almost equal to the horizontal expansive force. When the dry density is greater than 1.6 g / cm3, the horizontal expansive force The ratio of force to vertical expansive force changes little, and its value is stable at about 0.78. (3) The initial suction and the dry density all significantly affect the shape of the expansion force with time. For the samples with high suction and high dry density, the expansive force-time curve appears “platform” in the middle section. Under the same initial suction, the rate of change of swelling force increases with the increase of dry density, but the difference of the rate of change of swelling force of different dry density specimens decreases with time. Under the same dry density, Of the expansion force developed faster, but after a period of time low-suction sample expansion force will change faster than the high-suction sample. ⑤ The final equilibrium time of swelling force increased with the increase of dry density, while the initial suction had little effect on the equilibrium time.