循环加卸载下尾砂胶结充填体力学参数变化特征的试验研究与分析

Experimental Study and Analysis on Variation Characteristics of Mechanical Parameters of Tailings Filled Material under Cyclic Loading and Unloading

随着开采深度的不断提升,充填采矿法以其矿石损失贫化率低,井下作业环境好等优势已经获得许多矿山企业的青睐,通过尾砂胶结充填体循环加卸载试验,探讨了弹性应变,塑性应变,弹性模量以及加载变形模量这些力学参数随着循环加卸载的进行的演化特征以及充填体内部损伤的成因,分析了充填体试件的强度与配合比之间的关系,讨论了循环加卸载对充填体试件强度加强的原因,为矿山尾砂胶结充填体在井下复杂环境下的承载受力分析,强度设计,损伤预判以及井下安全施工提供理论依据。

With the continuous improvement of mining depth,the filling mining method has been favored by many mining enterprises for its low ore loss and dilution rate,good underground working environment and other advantages.Based on the cyclic loading and unloading test of cemented tailing backfill,the evolution characteristics of mechanical parameters such as elastic strain,plastic strain,elastic modulus and loading deformation modulus with the cyclic loading and unloading and the causes of internal damage of backfill are discussed;The relationship between the strength and mix ratio of the filling body is analyzed;This paper discusses the reason why the strength of filling body specimen is strengthened by cyclic loading and unloading;It provides theoretical basis for bearing capacity analysis,strength design,damage prediction and underground safety construction of cemented tailing backfill in complex underground environment.