Quantitative Research on Morphological Characteristics of Hysteretic Curves of Tailings Sand Improved by Clay Under Highway Traffic Load
In order to study evolution law of hysteretic curve of tailings sand improved by clay under traffic load,a series of dynamic triaxial tests with stepwise loading in increment were carried out on tailing sands and improved tailing sands.Long axis slope k,area S,degree of misclosure εp,and fullness degree α of the hysteretic curve were used to quantitatively describe the hysteretic curve of improved tailing sands.The effects of different frequencies,confining pressure and clay content on the morphological characteristics of hysteretic curves of the improved tailing sands were analyzed.The results show that the k value decreases nonlinearly with the increase of dynamic strain,increases with the increase of frequency and confining pressure,and increases first and then decreases with the increase of clay content.The values of S,εp,α are positively correlated with dynamic strain,and the curve is approximately exponential growth,both of which decrease with the increase of frequency and confining pressure,and decrease first and then increase with the increase of clay content.The dynamic characteristics of tailings sand improved by clay are significantly superior to those of unimproved tailings sand,and the optimum clay content is 30%.
万方数据
维普
