periodic weighting

基本解释

Cantilever beam of key strata breaks and caves into blocks, which is periodic weighting of mining face.
关键层悬臂梁破断垮落成承压砌块，其垮落及沿架后切落，形成工作面周期来压。
The fracture of overlying key stratum results in decrease of the roof caving angle and the increase of periodic caving span and weighting intensity.
覆岩关键层的破断使工作面顶板垮落角减小、周期垮落步距和来压强度都增大。
Periodic weighting was analysed by the bearing wedge model, simultaneity, the mechanics of first weighting and periodic weighting were expounded.
利用承压砌块模型分析了周期来压过程，并给出了初次来压和周期来压机理。

周期来压
The main roof can form suspension roof. The periodic weighting pace is 16.9-10m, and the average pace is 13.7m. The dynamic load factor is 1.4.
通过现场实测,分析得出了边角煤工作面矿压显现和顶板运动规律,工作面顶煤与直接顶的初次垮落步距为12.1m,老顶的初次来压步距为36.9m,动载系数为1.46,老顶能够形成悬顶结构,周期来压步距为16.9～10m,平均13.7m,动载系数为1.4,老顶来压较明显。