摘要
水平煤层采空区顶板长厚比一般不满足薄板理论要求,而分析和设计却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。
Generally, the design of stiff roofs in coal mine is based on thin plate theory, though the length/ thickness ratio of stiff roofs usually can not meet the requirements of thin plate theory. In order to carry out the elaborate design of stiff roofs, two totally different kinds of failure modes （ tensile failure and punch failure ） of stiff roofs are analyzed and the critical thickness of stiff roofs is obtained in Volasov＇s theory （ thick plate theory ）. As the influence of the stiff roof＇s gravity is not negligible, not only the gravity of the covering, but also the gravity of the stiff roof itself is considered to determine cxaefly the refined loads. Finally, the Majiliang coal mine is investigated for verification of the theory. The result shows that, the calculated critical thickness of the stiff roof agrees well with the measured one as expected. This paper is useful for the further research of failure mechanism of stiff roof.
出处
《地下空间与工程学报》
CSCD
北大核心
2009年第4期659-663,674,共6页
Chinese Journal of Underground Space and Engineering
关键词
符拉索夫理论
顶板
破坏机制
临界厚度
Volasov＇s theory
stiff roof
failure mechanism
critical thickness
