不同应力路径下铁尾矿砂力学性质试验研究  

Experimental Study on Mechanical Properties of Iron Tailings under Different Stress Paths

作　　者：华东静 韩雨东 任富强 HUA Dongjing;HAN Yudong;REN Fuqiang(School of Civil Engineering,University of Science and Technology Liaoning)

机构地区：[1]辽宁科技大学土木工程学院,辽宁省鞍山市114051

出　　处：《现代矿业》2024年第6期85-89,共5页Modern Mining

基　　金：国家自然科学基金项目(编号:52074299);辽宁科技大学大学生创新训练项目(编号:X202410146481)。

摘　　要：为探究应力路径对铁尾矿砂力学性质的影响,对铁尾矿砂进行了不同应力路径下的三轴固结排水试验,分析不同应力路径下铁尾矿砂的应力-应变特性、抗剪强度、变形特征、割线模量。结果表明:恒围压增轴压应力路径下的试样强度、黏聚力最大,恒轴压卸围压应力路径下的试样强度最小。恒围压增轴压应力路径下的轴向应变随平均有效应力的增加而增大,而卸围压增轴压应力路径下的平均有效应力保持不变,但轴向应变快速增大;恒轴压卸围压应力路径下的轴向应变随平均有效应力的减小而增大。当应力路径转角增大时,其割线模量也增大;当应力路径一定时,割线模量与围压呈正比关系。通过以上研究,可以有效评估其在不同工程条件下的力学性质,为分析尾矿坝的稳定性提供依据。In order to explore the influence of stress path on the mechanical properties of iron tailings sand,triaxial consolidation drainage tests under different stress paths are carried out on iron tailings sand,and the stress-strain characteristics,shear strength,deformation characteristics and secant modulus of iron tailings sand under different stress paths are analyzed.The results show that the strength and cohesion of the specimen under the constant confining pressure and increasing axial compression stress path are the largest,and the strength of the specimen under the constant axial pressure and unloading confining pressure stress path is the smallest.The axial strain under the constant confining pressure increasing axial compressive stress path increases with the increase of the average effective stress,while the average effective stress un⁃der the unloading confining pressure increasing axial compressive stress path remains unchanged,but the axial strain increases rapidly.The axial strain under the constant axial pressure unloading confining pressure stress path increases with the decrease of the average effective stress.When the stress path angle increases,the secant modulus also increases.When the stress path is constant,the secant modulus is proportional to the confining pressure.Through the above research,the mechanical properties of tailings dam under differ⁃ent engineering conditions can be effectively evaluated,which provides a basis for analyzing the stability of tailings dam.

关 键 词：铁尾矿砂 应力路径 固结排水 力学性质 

分 类 号：TD926.4[矿业工程—选矿]