平直与水平凹形边坡力学结构及稳定性对比研究  

Comparative study on stability and mechanical structure of straight slope and horizontal concave slope

作　　者：马力[1,2] 李克民[2] 韩流[2] 舒继森[2] 孟庆武[2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221116 [2]中国矿业大学矿业工程学院,煤炭资源与安全开采国家重点实验室,江苏徐州221116

出　　处：《采矿与安全工程学报》2016年第4期728-733,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金重点项目(51034005);煤炭资源与安全开采国家重点实验室自主研究项目(SKLCRSM10X01);江苏省普通高校研究生科研创新计划项目(CXLX13_950)

摘　　要：为了研究平直和水平凹形边坡稳定性差异的内部机理,以简支梁结构和两铰拱结构为基础模型,建立了平直和水平凹形边坡的整体力学模型,推导出端帮结构中的轴力、剪力和弯矩等基本力学参数计算公式,揭示了整体力学结构差异对稳定性的影响关系。通过建立边坡分析的三维模型,研究了平直与水平凹形边坡对稳定性的影响,结果表明:水平凹形边坡的曲面拱形结构能够有效缓解剪应力的集中分布,降低边坡失稳的风险,其稳定性优于平直边坡;内排跟进缩小坑底宽度能够有效提高端帮边坡稳定性;平直和水平凹形边坡稳定性随边坡角的增大均呈现线性递减;随着边坡高度的增加,水平凹形边坡相比平直边坡稳定系数增加的幅度逐步减小。In order to study the internal mechanism causing the differences of stability between straight slopes and horizontal concave slopes, the mechanical models of simply supported beam for straight slope and two hinged arch structure for horizontal concave slope were established, basis parameters formulas of axial force, shearing force and bending moment were deduced, and the effect of entirety mechanical structure difference on stability were revealed. The effect of straight slope and horizontal concave slope on stability was studied within a three-dimensional analysis model. The results have shown that：1） The stability of horizontal concave slope is greater than that of straight slope, because the curved arch structure of horizontal concave slope can alleviate shear stress concentration distribution effectively and reduce slope failure risk; 2） End-slope stability can also be enhanced effectively if bottom width is lowered by increasing advancing speed of inner-dump working face; 3） Straight and horizontal concave slope stabilities decrease progressively in a linear gradient with slope angle increasing; 4） And with slope height increasing, the rising amplitude of the stability coefficient of horizontal concave slope decreases gradually compared to that of straight slope.

关 键 词：几何形态 平直边坡 水平凹形边坡 力学结构 稳定性 

分 类 号：TD824[矿业工程—煤矿开采]