矿物成分对软黏土流变性质影响的试验研究

采用改进的直剪蠕变仪，对矿物成分及其含量对软黏土流变性质影响进行试验研究，在相同试验条件下完成了3组含高岭土、膨润土不同百分比试样流变性质的测试。测试结果表明，矿物成分及其含量是影响软黏土流变性质的重要因素之一，土体的黏滞系数随黏土矿物含量的增加而减小，即流变变形阻力随黏土矿物含量的增多而减小。试验结果分析认为，黏土矿物通过颗粒表面的结合水影响土的流变性质，其中强结合水是土体产生流变的主要因素，而弱结合水则是相对次要因素。试验结果有助于进一步认清土体流变的起因，对改进和完善现有流变变形计算理论有一定指导意义。

Experiment study on effects of mineral composition on rheological characteristics of soft clayey soil

By utilizing an improved direct shear creep apparatus,exploration to the rheological characteristics of soft clayey soil affected by mineral composition and its content in soil is performed;and rheological characteristics of three sets of soft clay samples with different contents of kaoline and bentonite,respectively,are tested under the same test conditions.The test results show that mineral composition and its content are two important factors on rheological behavior of soil;the viscosity coefficient of the soft clay reduces as the increase of the clayey mineral content;i.e.that rheological strain resistance decreases with the increase of the clayey mineral content.It is concluded that clayey mineral affects soil rheology characteristics by the way of water bounded mineral particle surface;furthermore,firmly bound water is a key factor and loosely bound water is only a secondary factor.The test results make a contribution to understanding of the origins of soil rheology and are of guiding significance for improvement and perfection on existing computing theories of rheology deformation of soft soil.