大采深巨厚砾岩综放开采地表沉陷规律

以常村煤矿工程地质资料和地表移动观测站资料为依据,详细分析了2113工作面地表终态下沉、动态下沉和终态水平移动的特征,从机理上研究了大采深巨厚砾岩开采条件下地表形变异常的原因.通过走向方向最大下沉点下沉速度的变化规律和工程实测资料,得出了地表形变与井下冲击地压的关系,确定了地表移动与变形的角量参数.结果表明,受关键层的控制,在整个观测过程中,地表始终处于缓慢下沉状态,且在沉降过程中不存在下沉突变点;下沉速度的反弹可以作为冲击地压危险的预报信息,巨厚砾岩层的运动是发生矿震的主要力源之一.

Research on surface subsidence law under condition of deep mining with thick overburden conglomerate based on field measurement datum

According to engineering geological and measurement data of Changcun colliery, the surface final subsidence,the dynamic subsidence and final horizontal movement characteristics of 2113 panel were analyzed in detail. Moreover, the reason of surface deformation abnormality under the condition of deep mining with thick overburden conglomerate was researched by mechanics. Then from subsidence speed variation law of the maximum subsidence point alone strike and engineering geological information, the relation between surface deformation and underground rock burst was deduced, and the angle parameters attributing surface movement and deformation was determined. The results show that through a whole surveying period the surface is in the state of gradual subsidence due to key-stratum. Furthermore, a subsidence mutational-point is no existing dur- ing surface subsidence. Therefore, the increase of surface subsidence speed could be dangerous prediction in- formation for rock burst; the movement of overburden thick conglomerate is one of main powers which may cause colliery earthquake.