露天矿复合边坡动水携砂蠕变模型研究  

Creep Model for Composite Slope of Surface Mine with Seepage Induced by Moving Water and Sand

作　　者：杜东宁[1] 王来贵[2] 张向东[1] 高龙飞 张淑坤[1] DU Dong-ning;WANG Lai-gui;ZHANG Xiang-dong;GAO Long-fei;ZHANG Shu-kun(College of Civil Engineering,Liaoning Technical University,Fuxin 123000,China;College of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学土木工程学院,辽宁阜新123000 [2]辽宁工程技术大学力学与工程学院,辽宁阜新123000

出　　处：《长江科学院院报》2018年第4期117-122,128,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51274110;51474121;51704143);国家煤炭联合基金重点支持项目(U1361211);博士后启动基金资助项目(165806);辽宁工程技术大学生产技术问题调研基金项目(20160058t)

摘　　要：露天矿复合边坡动水携砂现象危及边坡安全及周边环境。为揭示渗流作用下砂粒间相互作用机理,以砂颗粒团簇特征结构单元为对象,从颗粒尺度分析特征结构单元在自重、浮力、法向接触力、剪切接触力和渗透力作用下,砂粒间的非线性移动、变形过程及砂粒间在强力链上的力学行为。提出一种新的"塑转铰"元件,对Будин模型进行改进,建立"弹-黏-塑转铰"砂土蠕变力学模型,并给出其本构方程和蠕变曲线方程。通过动水携砂模型试验及砂土剪切蠕变试验数据,对改进Будин模型进行参数辨识和验证。分析结果表明:该模型精度较好,能描述蠕变过程中砂粒间的接触、摩擦、转动过程,能揭示含水砂层内的分级"阶梯"破坏现象及砂土颗粒间的剪切衰减及非衰减及第Ⅲ阶段正、负加速剪切蠕变过程及其变形规律,为分析散体颗粒间的相互作用机制提供了一种新的力学模型。The seepage induced by moving water and sand in composite slope in surface mine threatens the slope safety and surrounding environment.In order to reveal the interaction mechanism among sand particles under the action of seepage,with characteristic structure unit of sand clusters as object,we analyzed the process of nonlinear movement and deformation and mechanical behavior of the strong chain among sand particles under actions of gravity,buoyancy,normal and shear contact force and seepage force in particle size scale.Furthermore,we proposed a new plastic-to-hinge element to improve theБудинmodel and established a mechanical model of sand creep with elastic-visco-plastic hinge.According to model test of moving water and sand and data from sand creep test,we gave constitutive equation and creep curve equation of the model and identified the parameters of the improvedБудинmodel and verified its accuracy.Results show that the model could describe the contact,friction and rotation among sand particles during creep process with good accuracy;secondly,the model reveals the graded ladder-like failure phenomenon in the water-sand layer and shear attenuation and non-attenuation among sand particles,as well as the positive and negative accelerating shear creep process in the third stage.The present model offers a new mechanical approach for analyzing the interaction mechanism among discrete particles.

关 键 词：露天矿 动水携砂 复合边坡 改进Будин模型 砂土蠕变 

分 类 号：TD824.7[矿业工程—煤矿开采]