采空区顶板大面积冒落危害预测

The prediction of the hazard caused by weighting over great extent of top layer in mine worked-out section area

针对房柱法开采后形成了大量采空区,随时间推移,矿柱的岩体强度下降,采空区面积增大造成部分矿柱因应力转移而使载荷增加,在外力作用下矿柱发生连锁垮塌,大面积顶板在较短时间内冒落,所产生的冲击气浪冲垮设备、设施,造成人员伤亡。本文建立了采空区大面积顶板冒落造成的冲击气浪的最大速度预测模型。

a great number of worked - out section area were formed after a gypsum mine was mined in the form of pillar- room, with the time passing, the rock strength of jamb builds down. The load of a great number of jambs increases by reason of stress transferring while worked - out section area expands, jambs break down due to external force, and great extent of top layer falls down in short time, which makes air in worked - out section area be compresed sharply and engenders airflow that will burst fixture and hurt people. The paper builds the top speed prediction modal of airflow which is engendered due to weighting over great extent.