氧化铝厂赤泥的基本物理力学性质

对氧化铝厂新鲜赤泥滤饼、自燃固结赤泥、击实赤泥等354组样品进行含水率、密度、比重、液塑限试验、干密度、孔隙比、饱和度、渗透、固结、固结快剪、三轴剪切试验、颗粒等物理力学指标测试。综合分析研究后得出:新鲜赤泥滤饼的性质类似于粉质粘土,具有高含水率、高饱和度、孔隙比大、力学强度较低的特点;赤泥的颗粒级配较好,均匀性差;赤泥的最优含水率一般为41.6%,最大干密度为1.25g/cm3,在最优含水率时进行击实,击实后抗剪强度指标明显提高;赤泥的力学强度随着赤泥堆存时间的增加而提高。为氧化铝厂赤泥堆存、赤泥尾矿坝建设的初步设计计算提供了基础数据。

Basic Physical and Mechanical Properties of Red Mud from an Aluminum Plant

A total of 354 samples of fresh filtered, natural consolidated and compacted red mud cakes are tested for moisture, unit weight, specific gravity, dry density, void ratio, degree of saturation, permeability, grain size distribution, consolidation, consolidated and undrained shear test and triaxial shear test. The test results indicate that the freshly filtered red mud cakes have the geotechnical properties similar to that of silty soils. It has the characteristics of high moisture contents, high degree of saturation, high void ratio and low shear strength. The red mud samples are well-graded. The optimum moisture content under the Proctor test is 41.6% with a maximum dry density of 1.25g/cm^3. The shear strength of the red mud samples prepared under the optimum moisture content has a significant increase. An increase of shear strength of red mud samples with time of storage is also observed. These findings provide references for the red mud of aluminum plant storage and the design and construction red mud storage dams.