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针对尾矿库扩容增高建设过程中遇到的固结问题,以粘粒尾矿材料为试验材料开展一维固结试验,研究加荷比、干密度、预压荷载大小及预压时间对粘粒尾矿材料的次固结系数的影响。研究表明:在固结应力为600kPa之前加荷比会对次固结系数有影响,600kPa以后几乎没有影响;次固结系数随着干密度的增大而增大;经过预压之后,试样沉降量明显小于未处理的试样,预压效应在固结应力为100~800kPa时起作用,当固结应力大于800kPa时,预压处理效应消失;预压时间在一定范围内对次固结系数影响较大,当达到一定的时间时,这种时间效应逐渐消失。最后,研究试验材料的次固结系数与压缩指数间的关系,研究表明二者之间可以用线性关系式表示。
In view of the consolidation problem encountered during the expansion of the tailings dam, a one-dimensional consolidation test was conducted using clay tailings as the experimental material. The effects of loading ratio, dry density, preloading load time and preloading time on viscosity Effect of Secondary Consolidation Coefficient of Grain Tailings Material. The results show that the loading ratio before 600kPa of consolidation stress will affect the secondary consolidation coefficient and will have little effect after 600kPa. The secondary consolidation coefficient will increase with the increase of dry density. After the pre-compression, the sample The settlement is obviously smaller than that of the untreated specimen. The preloading effect is effective when the consolidation stress is 100-800 kPa. When the consolidation stress is more than 800 kPa, the preloading effect disappears. The preloading time is within a certain range for secondary consolidation The effect of the coefficient is large, and when it reaches a certain time, the time effect gradually disappears. Finally, the relationship between the secondary consolidation coefficient and the compression index of the test materials was studied. The results show that the relationship between the two can be expressed as a linear relationship.