基于厚板理论水平煤层顶板临界厚度分析.pdfVIP

5 4 V o.l 5 2009 8 Chinese Journal o f U nderground Sp ace and Eng ineering A ug. 2009 * 基于厚板理论的水平煤层顶板临界厚度的分析 贺广零 ( 200092) : 水平煤层采空区顶板长厚比 一般不满足薄板理论要求 而分析和设计 多以薄板 理论为依据为了实现精细化分析和设计 基于符拉索夫厚板理论 研究了两种常见的顶板失 效模式 (受拉破坏和冲切破坏) 并分别推导了顶板破坏的临界厚度因为水平煤层顶板较 厚 其自身重力的影响已不能忽略为了使得荷载更为精确 在分析过程中不仅考虑了上覆岩 层荷载 而且还考虑顶板自身重力的影响最后以马脊梁矿为例 计算了该矿体顶板的临界厚 度 并与实际顶板厚度进行比较 两者具有一致性 为进 一步研究顶板破坏机制和制定相关规 范提供了参考 : 符拉索夫理论; 顶板; 破坏机制; 临界厚度 : TD 325 : A : 1673- 0836 ( 2009) 04- 0 659 - 05 Determ ination of Critical Thickness of Stiff Roof in CoalM ine Based on Thick Plate Theory HE Gu ang- ling (Deparrm ent of Building Eng ineering, Tongj i University, Shanghai 200092, China) Abstract: G enerally the design o f stiff roo fs in co al m ine is b ased on thin plate theory though the leng th/ thickness ratio o f stiff roo fs u sua lly can not m ee t the requ irem ents of th in p late theory. In order to carry out the e labo- rate design o f stiff roofs wt o tota lly diffe rent kinds o f fa ilure m odes ( ten sile fa ilure and punch fa ilure) of stiff roofs are ana lyzed and the critical th ickness of stiff roofs is obta ined in V o lasov s theo ry ( thick plate theo ry) . A s the influ- ence of the stiff roo f s grav ity is no t neg lig ib le not only the gravity o f the cove ring but a lso the grav ity of the stiff roo f itse lf is con sidered to determ ine exaetly the ref ined loads. F inally the M ajiliang coa lm