错层位巷道布置放顶煤开采关键层的稳定特征

Stable characters of key stratum in stagger arrangement roadway layout top-coal caving mining

通过理论分析错层位巷道布置关键层的稳定特点,发现接续工作面的长度对上一工作面关键层的稳定性有影响.借鉴已有成熟的关键层理论公式,在计算中采用四边固支薄板并结合固支梁的力学特性,对错层位巷道布置关键层的稳定性进行公式推导,得出关键层跨度的极限临界值.通过相似模拟实验,验证了错层位巷道相邻工作面关键层稳定的特点.结果显示,错层位巷道布置随着接续工作面长度的增加造成接续工作面之间公共关键层的位置不断升高,直至地表,多个工作面之间显现出单一超长工作面关键层的特点.

Through the theory analysis on the stable characters of key stratum on the roadway layouts of stagger arrangement, found the effect of the length of the connection working face on the stability of the key stratum of the former working face. Using the theoretical formula of the mature key stratum for reference, a formula derivation was made which use the sheet of the four edges clamped and mechanical properties of fixed beam in calculation on the stability of the key stratum in the stagger arrangement roadway layouts and then got the limit critical value of the span of key stratum. Through the analogous simulation experiment, verified the stable character of the key stratum of adjacent working face in the stagger arrangement roadway layouts. In summary, with the continuation of the increase on the length of the connection working face in the stagger arrangement roadway layouts, the position of the common key stratum which appears the characters of the key stratum in the overlong working face between the connection working face rises constantly and finally arrives the surface.