膏体充填综采底板破坏规律与实测研究

针对承压水上煤炭资源安全开采的难题,以河南焦煤集团朱村煤矿承压水上膏体充填开采为工程背景,采用理论计算、数值模拟分析和现场实测的方法,研究了膏体充填开采底板破坏规律及演化特征,并对膏体充填开采底板破坏范围和突水性进行了预测研究,揭示了膏体充填开采控制底板破坏的力学机理。研究表明:煤矿底板破坏深度随采高的增加而逐渐增大,但当增加到一定高度(1.8 m)后,底板破坏深度趋于某一相对稳定值;膏体充填综采可使得底板破坏深度由垮落法开采的12.0 m左右,减小到2.0 m左右,突水系数由0.19~0.56减小到0.08~0.20;实测表明:膏体充填综采完整区域底板最大破坏深度约4 m,断层影响处底板最大破坏深度范围为10.0~12.0 m,膏体充填综采过程中未出现突水灾害。膏体充填综采相当于降低了煤层采高,相对增加了底板隔水层厚度,有效提高矿井开采的安全保障度。

Study on field measurement and floor failure law of paste filling fully mechanized mining

To solve the safety problem of coal mining above confined water, based on the engineering background of paste filling mining above confined water in Zhucun colliery of Henan Energy and Chemical Industry Group, using the theoretical calculation, numerical simulation analysis and field measurement method, failure laws of floor and evolution characteristics in paste filling mining have been studied , and prediction research of floor failure scope and water-inrush character of paste filling mining has been conducted, which has in the end revealed the mechanical mechanism of control floor failure in paste filling mining. Research has shown that the floor failure depth increases with the in-crease of mining height, but when added to a certain height (1.8 m), the floor failure depth tends to a relatively stable value;paste filling fully mechanized mining can make floor failure depth of about 12.0 m by the method of caving mining, reduce to about 2.0 m, and the water inrush coefficient reduce from 0.19-0.56 to 0.08-0.20. Actual measurement has shown that the maximum floor failure depth in full area of paste filling fully mechanized mining is about 4 m, and in area influenced by fault ranges from 10.0 m to 12.0 m. Water inrush disaster has not appeared in any process of paste filling fully mecha-nized mining, and the safety degree of mine extracting has been improved by lowering mining height and relatively increasing the thickness of water-resisting floor.