成庄矿岩溶陷落柱特征与成因分析

Characteristic for Karstic Collapse Columns of Chengzhuang Coal Mine and Its Genetic Analysis

成庄井田岩溶陷落柱相当发育,根据三维地震探测和井下开采3号煤层揭露,井田内有大小陷落柱185个,平均3个/km2。根据成庄井田地质报告及井田内钻孔数据等资料,分析了成庄井田内陷落柱的发育特征及成因。结合山西岩溶水强径流带的影响分析认为,成庄井田陷落柱主要是由于岩溶水强径流对可溶性煤系地层的溶蚀作用形成的。虽然井田内揭露的陷落柱大部分不导水,但当掘进到井田西部带压开采区,可能会沟通强含水层,引发突水事故。

The karstic collapse columns was widely developed in Chengzhuang mine field. According to the three-dimensional seismic exploration and the exposed 3rd coal seams in underground mining,it is known that there are 185 collapse columns in the mine field,the average growth of about three per square kilometers. According to the geological report and borehole data and other information of Chengzhuang mine field,the developmental characteristics and causes of the collapse column in Chengzhuang mine field were analysed. Combined with the analysis on the influences of strong runoff of Shanxi Formation,it was proposed that the collapse column is mainly due to the dissolution process of strong karst water runoff to soluble coal-bearing strata. Although most of the exposing collapse columns don＇t have transmissibility,but it may communicate strong aquifers and cause water inrush accidents when mining into areas under safe water pressure of aquifer in the west of mine field.