赤泥力学性质对比试验研究

Experimental Tests of the Mechanical Properties Contrast of Red Mud

针对赤泥所具有的高持水性和强碱性特征,进行了两种不同条件下的制备样试验和PVC管自渗固结样试验。经分析,拜尔法赤泥的含水量在一定的界限值之内时,随着密度的增大,压缩系数减小,压缩模量、粘聚力、内摩擦角都呈增大趋势,当超过界限值时,呈相反趋势,制备样与自渗固结试样的渗透系数变化不大。混合法赤泥的强度变化与拜尔法赤泥相反。提出了界限含水量是赤泥力学性质的转折点,并建议了界限含水量的确定方法;给出了不同性质赤泥渗透系数的数量级。

The red mud has the characteristics of high water content and strong alkaline. The one dimensional consolidation tests under seepage condition provided by a standing PVC pipe. The test samples were prepare with two different conditions： Bayer Method and Mixing Method. The results indicate that, when the moisture content is less than a threshold value, the co- efficient of compressibility decreases with the unit weight and the compression modulus, cohesion and the international friction angle increase with the unit weight. Whereas, when the moisture content exceeds the threshold value, an opposite trend can be found. These factors have weak correlations with the coefficient of the seepage. When the samples are prepared by the Mixing Method, an opposite trend with the unit weight are demonstrated. It is concluded that the threshold moisture is the turning point of the mechanical properties of the artificially prepared red mud. The paper propose the method of determining the thresh- old moisture content and the seepage range of different red mud are also Suggested.