采前大采高煤层工作面支护阻力的确定

Determination of Support Resistance of Large Mining Height Coal Seam Working Face Before Mining

以普通采高浅埋深煤层的"台阶岩梁"结构理论为基础,根据大采高煤层矿压显现规律提出了台阶沉降角,推导出了大采高浅埋深煤层支护阻力公式,并以某矿3#煤层的实际岩层条件为基础,用数值模拟的方法对公式的可靠性进行了验证,两种方法所得到的结果相差不大,说明得到的理论公式是可靠的。对相似条件煤层采前液压支架支护阻力确定具有一定的参考意义。

Presented step subsidence angle according to large mining height coal seam pressure regularity and deduced the periodic pressure support resistance formula based on the shallow depth coal seam'step beam'structure theory,and taking a mine No. 3 coal seam actual strata condition,and check the reliability of the formula under the condition of high mining with numerical simulation method,the difference is very small between the two results,illustrate the theoretical formula is reliable. It has certain reference value for the determine hydraulic support resistance in the similar conditions of coal seam before mining.