Strength and deformation behaviors of cemented tailings backfill under triaxial compression  被引量:10

三轴压缩条件下胶结尾砂充填体的强度和变形特性

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作  者:XU Wen-bin LIU Bin WU Wei-lü 徐文彬;刘斌;吴蔚律(School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China;School of Resources and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区:[1]School of Energy and Mining Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China [2]School of Resources and Environment Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China

出  处:《Journal of Central South University》2020年第12期3531-3543,共13页中南大学学报(英文版)

基  金:Projects(2018YFC0808403,2018YFE0123000)supported by the National Key Technologies Research&Development Program of China;Project(800015Z1185)supported by the Yueqi Young Scholar Project,China;Project(2020YJSNY04)supported by the Fundamental Research Funds for the Central Universities,China。

摘  要:It is of great significance for safety reason to obtain the triaxial compressive properties of cemented tailings backfill(CTB).The influence of cement content,curing age and confining pressure on strength and deformation properties of CTB was examined and discussed.Results indicate that the triaxial compressive and deformation behavior of CTB is strongly affected by the cement content,curing age and confining pressure.The increase in cement content,curing age and confining pressure leads to a change in stress−strain behavior and an increase in the axial strain at failure and post-peak strength loss.The cohesion of CTB rises as the curing age and cement content increase.However,the enhancement in internal friction angle is trivial and negligible.It should be noted that the failure pattern of CTB samples in triaxial compression is mainly along a shear plane,the confining pressure restrains the lateral expansion and the bulging failure pattern is dominantly detected in CTB samples as curing age length and cement content increase.The results will help to better understand the triaxial mechanical and deformation behavior of CTB.胶结充填体的三轴压缩特性对采场充填体的稳定性具有重要意义。本文研究了水泥掺量、养护龄期和围压对胶结充填体在三轴压缩条件下的强度和形变性能的影响。结果表明:水泥掺量、养护龄期和围压对胶结充填体的三轴压缩变形及力学特性有较大影响。随着水泥掺量、养护龄期和围压的增加,应力-应变行为发生变化,峰值点处轴向应变增加,且峰值后强度损失增加。充填体的粘聚力随着养护龄期和水泥掺量的增加而增大,水泥掺量对充填体的内摩擦角影响小。充填体试样主要沿主剪切面发生破坏,围压抑制充填体侧向膨胀;随着养护龄期和水泥掺量的增加,充填体试样主要呈现膨胀破坏形态。研究结果将有助于更好地理解胶结充填体的三轴力学和变形行为。

关 键 词:cemented tailings backfill triaxial compressive strength volumetric strain elastic modulus COHESION friction angle 

分 类 号:TD803[矿业工程—矿山开采]

 

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