顶板受冲击垮落的理论分析及工程应用

Theoretical Analysis of Roof Caving Controlled by Impact Process and It's Engineering Application

针对神东煤炭公司大柳塔煤矿活井21303综采工作面,上层采空区顶板突然大规模垮落对下层顶板及支架的突然冲击问题,文章采用动量定理、动量矩定理、达朗伯原理推出了顶板垮落瞬间的运动量及顶板切顶垮落所需要的剪力值计算公式,用ANSYS LS—DYNA程序对顶板垮落过程进行了数值计算,得到了最大冲击力,在大柳塔煤矿活井21303综采工作面对顶板垮落特征进行了实际观测和理论成果验证。理论分析、数值计算及工程实测结果相辅相成。文章不但解决了大柳塔煤矿活井21303综采工作面,上层顶板突然大规模垮落对下层顶板及支架的突然冲击问题,而且对矿山开采过程中类似的问题提供了理论指导。同时给出了用ANSYS LS—DYNA程序计算冲击力的方法。

Aiming at bottom roof caving and support impact problems induced with abrupt large scale caving upper roof in face 21303 of Daliuta mine, this paper put forward the motion parameter at roof caving and calculation formula of roof shear breaking force with the help of theorem of momentum, theorem of moment of momentum and D＇ Alembert principle. Roof caving process was simulated by Ansys Ls-DYNA program, and maxim impact force was got. The theoretical research outcomes in the paper were applied in face 21303 of Daliuta mine, and were accordant with actual observing status of roof caving process. The theoretical analysis, simulating calculation and engineering observing result were proving each other. Not only the bottom roof caving and support impact problems induced with abruptly large scale caving of upper roof in waste in face 21303 of Daliuta mine were solved, but also the theoretical direction for similar engineering problems in mining process was provided. The advance of this paper is in giving the calculating method of the roof impact force by ANASIS program.