倾斜空区顶板三铰拱轴曲线结构自稳分析  

Analysis of the Stability of Three-Hinged Arch Axis Curve Structure of Tilted Roofs

作　　者：翟会超[1] 任凤玉[1] 南世卿 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]河北钢铁集团矿山设计有限公司,河北唐山063000

出　　处：《东北大学学报（自然科学版）》2015年第11期1629-1632,1642,共5页Journal of Northeastern University(Natural Science)

基　　金："十二五"国家科技支撑计划项目(2013BAB02B08)

摘　　要：研究发现动采应力再分布使空区顶板在失稳前两拐角处形成塑性铰区,承载机构转为充分自稳的三铰拱形.针对这一特点,提出将空区顶板近似为半跨的三铰拱轴曲线结构,并建立以空区跨度L、拱失f、顶板岩层载荷q(x)为变量的力学模型,推导冒落线方程y(x)和拱轴压力N(x)方程,分析空区顶板的稳定性和冒落线形式,并计算空区的临界跨度和临界暴露面积.以排山楼金矿空区为例,利用模型得出活动延深方向临界跨度70 m,走向140 m,临界暴露面积7 693 m2.提出禁止间柱回采,及时充填空区的治理方法,保障井下安全.A plastic hinge area was formed before the empty area in the roof corner lost its stability and the three-hinged arch bearing mechanism was formed due to stress redistribution.Based on this characteristic,the roof was approximately regarded as three-hinged arch axis curve structure with a half span,the mechanical model including span（ L）,arch loss（ f） and roof rock load（ q（ x）） was established to solve the caving line equation（ y（ x）） and arch axis equation（ N（ x））,the roof stability and the caving line form were analyzed,and the critical span and the critical exposure area were calculated. Taking Paishanlou Gold Mine for example,the conclusion of sub stable goaf was drawn with the critical span being 70 m in transverse,140 m in the vertical dimension and the critical exposure area 7 693 m2 by using the mechanical model. Therefore,the pillar mining is prohibited and the rapidly filling area is proposed so as to guarantee underground safety.

关 键 词：倾斜空区顶板 三铰拱轴 稳定性分析 临界跨度 空区治理 

分 类 号：TD327[矿业工程—矿井建设]