急斜煤层综放开采中基本顶的稳定性  

Stability analysis of basic roof in fully-mechanized top-coal caving mining of the steep seam

作　　者：张嘉凡[1] 

机构地区：[1]西安科技大学力学系,陕西西安710054

出　　处：《湖南科技大学学报（自然科学版）》2009年第4期7-10,共4页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(50974102);高等学校博士点专项基金资助项目(20040704002)

摘　　要：针对受纵横荷载共同作用的斜置矩形板力学模型,充分考虑中面内力对弯曲的影响,确定了相应的荷载势能,运用能量法得到顶板挠度和应力的解析表达式;根据急斜煤层水平分段综放开采的岩层结构形态,应用解析式分析了苇湖梁煤矿顶板挠曲变形规律及其随影响因素的演化途径,给出了水平分段综放开采的关键技术参数,从岩层控制学的角度提出相应的工程技术措施.研究表明:板的挠曲变形及应力与板体材料、结构几何特征及倾角有关,并呈现明显的非线性特征;苇湖梁煤矿急斜煤层综放开采水平分段高度的合理取值范围应在20～30m之间,现场应用取其下限20m是安全适宜的;顶板岩层运移最剧烈的区域在采空区沿走向的中部,应采用上部塌陷区充填的方法减小顶板悬露长度,减缓上覆岩层的运动,进而控制地表沉陷,保护自然生态平衡.图4,参9.To the mechanical model of inclined rectangle board subjected to forces acting vertically and horizontally, corresponding loading potential energy and the analytical solution of deflection and stress, considering the influence of inner force in central surface on the bend of the board, were given by using the theory of board and energy method. In accordance with characteristics of the structural form of rock layers of horizontal section top coal sublevel caving in the mining steep seam, deflected deformation rules of the roof and evolution path along influencing factors were discussed, the critical technical parameter of horizontal section top coal sublevel caving was got, engineering technique measures to control strata movement were given in Weihuliang coalmine. It is shown that, the deflected deformation and stress are related to board material, geometrical properties and angle of the board with obvious nonlinear properties. Then the reasonable range of horizontal section altitude of top coal sublevel caving is between 20 m and 30 m, it is safe and appropriate to select lower limit 20 m in Weihuliang coalmine. The severest area of strata movement is in the central of mined-out area along mining, the upper part of subsidence area must be filled to reduce the length of hanging roof and retard the movement of overlying strata, further the engineering measure can control the ground subsidence and also protects ecological environmental. 4figs., 9refs.

关 键 词：纵横荷载 斜置矩形板 解析解 变形特征 岩层控制 

分 类 号：O343.2[理学—固体力学]