武安煤田隐伏陷落柱发育特征研究

Study on the Development Characteristics of Hidden Collapse Columns in Wu an Coalfield

武安煤田岩溶陷落柱相对比较发育,是开采下组煤过程中底板水害的重要导水通道,分析确定陷落柱的发育规律及导水性对矿井安全具有重大作用。在以往采掘和勘探孔揭露的基础上,利用水平分支孔对陷落柱在奥灰中赋存状态和导水性进行探查。依据水平分支孔的岩屑(心)和自然伽马、消耗量等数据发现本区岩溶陷落柱在奥灰中发育形状多为不规则型,中心轴为歪斜型,距向斜轴部距离越近,形状不规则性越明显,陷落柱的长短轴可能发生扭转。该区陷落柱柱体分布符合“三带”理论,多为半整体陷落柱,其导水性与岩溶发育程度和富导水性相关,外围影响带和边缘过渡带普遍导水。

Karst collapse columns are relatively developed in Wu an coal field,which is an important water diversion channel for floor water in the process of lower coal mining.It is important for mine safety to analyze and determine the developing law and hydraulic conductivity of collapse columns in this area.The occurrence state and conductivity of collapse column in Ordovician limestone were investigated by horizontal branch hole on the basis of previous excavation and exploration hole exposure.According to the data of cuttings and cores of horizontal branch holes,natural gamma and consumption,it is found that the shape of karst collapse columns developed in Ordovician Limestone in this area is irregular,and the central axis is skewed.The closer the distance from the syncline axis,the more irregular the shape is,and the long and short axes of collapse columns may be twisted.The column distribution conforms to“three belts”theory,and most of them are semi-integral collapse columns.The hydraulic conductivity is related to the development degree of karst and the abundant hyraulic conductivity.The peripheral influence zone and the marginal transition zone are water-conducting zones.