坚硬顶煤弱化对放顶开采影响分析

Analysis of the Impact of Hard Top-coal Weakening on Top Coal Mining

利用三轴压缩实验与数值模拟切合的方法对煤体的宏观力学参数与微观力学参数进行测定,在此基础上构建放顶煤模型并进行开采模拟,模拟运行结果表明,通过有效的顶煤弱化措施,顶煤煤体颗粒间粘结力显著降低,煤体强度减弱,顶煤放出率大幅提升,有助于矿井经济效益的提升。

By using the triaxial compression test and numerical simulation method, this paper determined the macroscopic mechanical properties and micro mechanics parameters on the basis of which top coal model was built and mining simulation was carried out. The results showed that effective measures of weakening top-coal could make cohesive force between top coal particles significantly reduced, the strength reduced and the top-coal rate greatly improved, which will help to improve the economic benefits of the mines.