摘要
以河北某矿2408工作面运输平巷为工程研究背景,分析无煤柱沿空留巷变形破坏规律,提出了沿空留巷的控制机理。结合地质生产条件,采用FLAC3D数值模拟对比分析了一般支护条件与加强巷帮支护条件下留巷围岩的变形规律:帮高强高预紧力锚索可以大大降低围岩变形量,缩小围岩塑性区。矿压观测结果:留巷在接受二次采动影响后,顶底板最大移近量为471 mm,两帮最大移近量为315 mm。
The transportation roadway of a coalmine＇s 2408 work face in Hebei province, is selected as the engineering background. And the law of deformation and failure, in the case of gob side entry retaining without coal pillar, have been analyzed. The control mechanism of gob side entry retaining without coal pillar are as follows. The differences between the deformation law of the general conditions and that of strengthen supporting roadway wall are drew with combination of geological production conditions and the using of a numerical simulation software-FLAC^3D. The amount of rock deformation and the area of plastic zone can be greatly reduced by the high strength and preload anchor in roadway wall. The observations mine pressure indicates that, after the secondary effects of mining, the relative maximal roof-to-floor convergence is 471 mm, both sides relative maximal convergence is 315 mm.
出处
《煤炭技术》
CAS
北大核心
2014年第10期120-123,共4页
Coal Technology
关键词
沿空留巷
变形量
帮锚索
采动
gob side entry retaining
amount of deformation
anchors in the coal wall
mining
