main roof caving

The paper regards the main roof strata in uphill and downhill mining of an inclined longwall as a elastic plate.

本文将倾斜长壁仰斜、俯斜开采的老顶岩层视为倾斜弹性板。

The theoretical calculation of first weighting interval of main roof and the utilization of measured data of roof weighting interval in practice for improving the accuracy of its calculation are both important to ground pressure control.

老顶初次来压步距的理论计算以及利用实测来压步距资料来改善理论计算的来压步距精度是矿压管理中的重要工作。

On this paper the method of plate limit analysis is applied to the determination of two breakage lengths of main roof.

本文应用板的极限分析法求老顶的断裂步距,从而解决了按板模型周现有的方法不能计算老顶周期断裂步距的问题这种方法的另一个显著的优点是它不但适用于矩形采空区而且也适用于非矩形采空区。

Using the initial post-buckling theory and the cusp catastrophic model,the bifurcation buckling mechanism and unstability of roof strata were studied to derive the formulae of the main roof breaking convergence during the first weighting,to build the criterion of step convergence after the main roof breaking and to determine the final step convergence value.

研究结果表明,综合应用初始后屈曲理论和突变理论,可根据浅埋煤层顶板结构的结构特征、岩体材料以及上覆厚松散沙层等赋存状况确定长壁开采工作面初次来压期间基岩老顶可能出现的灾害形式。

This paper analyzes the influence of the regulation of the old roof pressure of the mining field on the roof fall accidents of the mining field, and puts forward some corresponding effective preventive measures.

分析了采场老顶来压规律及其对采场冒顶事故的影响,针对冒顶事故的发生提出有效的预防措施。

Break of main roof ahead of workface and ground pressure;

采场老顶岩梁的超前破断与矿山压力