摘要
综放采场顶煤放出率控制着采空区的充填状况,从而影响着大厚度坚硬顶板的稳定性。本文建立了周期来压阶段综放采场顶板结构整体变形失稳和局部铰接失稳的力学模型;根据结构稳定理论和强度理论,得到了保持顶板结构整体变形稳定和岩块局部铰接稳定的力学和几何条件,从而建立与顶煤放出率相关的综放采场顶板稳定性判断准则;结合具体采场实例,给出了与顶煤放出率相关的综放采场顶板稳定性判断曲线和方法,为现场针对不同顶板设计合理的顶煤放出率,从而实现顶板的安全控制提供理论依据。
The top coal's recovery ratio in fully-mechanized sublevel caving face controls the stowing degree of the goaf, thereby influences the stability of hard and massive overlying roof. This paper establishes the mechanics model of the stability of the whole deformation of roof structure and the stability of part contact of the main roof. Based on the structure stability theory and the strength theory, the unifying mechanics conditions and geometry conditions between the stability of the whole transmutation of roof structure and the stability of part contact of the main roof are gained, thereby the judgment rules of roof stability with the top coal's recovery ratio are established in fully-mechanized sublevel caving face. Based on an example of fully-mechanized sublevel caving face, the judgment figure and method with the top coal's recovery ratio are put forward, the theoretical bases of designing the safe top coal's recovery ratio are provided according to different roof, and the safe roof controlling is achieved at coal mine.
出处
《矿山压力与顶板管理》
北大核心
2005年第1期80-83,118,共4页
Ground Pressure and Strata Control
基金
国家自然科学基金资助项目(50074021)
重大国际合作基金(50320120001)
