大采高采场上覆岩层运移规律数值模拟

为了研究大采高采场上覆岩结构及其运移规律,给大采高工作面的高产高效开采提供理论基础,通过3DEC数值模拟软件,以某矿6.2 m大采高工作面岩层赋存特征为工程背景,分别建立采高为2.2 m,3.2 m,4.2 m,5.2 m,6.2 m时的数学模型,研究不同采高下的上覆岩层垮落规律.结果表明:采高较低时,随着采高的增加,碎胀系数随着增加,冒落高度也随着增加,但是当采高增加到5.2 m时,随着碎胀系数的增加,冒落高度却几乎不变.采高为2.2 m时,最大离层量为1 m,随采高的增加,离层量基本呈直线增加,当采高大于4.2 m时,离层量增加迅速,当采高增加至6.2 m时,最大离层量可达到3.05m.随着离层量的增加,基本顶失稳时容易给支架造成冲击性载荷,增加动载系数,影响大采高支架的纵向和横向稳定性.

Movement law of overlying rock in large mining height face by simulation

For the mining height mining overburden structure and migration rule,for big mining height of high yield and high efficiency mining provides theory basis,through 3 DEC numerical simulation software,to 6.2 m in sihe coal mine large mining height the occurrence characteristics of rock engineering background,we establish mining height of 2.2 m,3.2 m,4.2 m,5.2 m,6.2 m of the numerical model to study the different mining height on the overlaying strata breaks down fall characteristics.The results show that mining height is low,with the increase of mining height,the hulking coefficient increased,falling height also increased,but when mining height increases to 5.2 m,with the increase of the hulking coefficient,take down height but almost the same.Mining height of 2.2 m,the largest amount of abscission layer 1 m,with the increase of mining height,overburden bed separation grouting quantity basic sharply increase,when mining height more than 4.2 m,overburden bed separation grouting increased rapidly,when mining height are increased to 6.2 m,the overburden bed separation grouting quantity achieved 3.05 m.With the increased amount of overburden bed separation grouting,the basic roof easily when instability caused by impact load to stents,increase the dynamic load coefficient,great influence mining height in support of longitudinal and transverse stability.