In order to forecast the pace of roof primary breakage and periodic breakage,and then to determine the feasible mining program,the similar material model experiments is done.

• 为了确定布尔洞煤矿浅埋煤层开采的初次来压步距和周期来压步距,确定合理的开采方案,进行了四架次的相似材料模型实验。