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合理注水对松软煤层片帮事故能起到很好的预防作用,为了探讨注水增强松软煤壁稳定性的原因,针对郑煤集团教学二矿31101工作面具体的地质条件,采用FLAC3D软件模拟分析了注水对工作面前方煤体应力与应变的影响。结果表明,注水后工作面前方煤体应力峰值向深部转移,卸压带增长,卸压带内应力值降低;煤体可压缩变形量增加,有利于弹性能的缓慢释放;塑性区范围显著增大,抵抗前方煤体弹性能突然释放的能力增强;并且工作面煤壁形成粘结层,从而起到了预防片帮的作用、保证了工作面煤壁的稳定。
Reasonable water injection can play a very good role in preventing the accident of soft coal seam. In order to investigate the reason of water injection to enhance the stability of soft coal wall, according to the geological conditions of 31101 working face of No. 2 Mining Institute of Zheng Coal Group, FLAC3D software was used to simulate and analyze Influence of Water Injection on Stress and Strain of Coal in Front of Working Face. The results show that the stress peak of the coal in front of the working face shifts to the deep after the water injection, the pressure relief zone increases and the stress value in the pressure relief zone decreases. The compressive deformation of coal increases, which is beneficial to the slow release of elastic energy. Large, the ability to resist the sudden release of the elastic properties of the coal front is enhanced; and the coal wall of the working face forms an adhesive layer, thereby preventing the slab from acting and ensuring the stability of the coal wall of the working face.