摘要
利用FLAC3D数值模拟软件对淮南矿区新集一矿远距离下保护层回采时上覆被保护层应力分布和膨胀变形规律进行了研究。结果表明,下保护层回采后可使远距离被保护层得到充分卸压,通过卸压应力反算出卸压保护角为60～64.5°,被保护层膨胀变形量最大为26.82mm,此时膨胀变形率为5.96‰,膨胀变形为抽采被保护层瓦斯创造了条件。
The FLAC3D numerical simulation software is used to study the stress distribu- tion and expansion deformation law of the overlying protected layer during the remote lower pro- tective layer mining in some coal mine of Huainan Colliery. The results show that, the remote protected layer can fully relieve pressure after the lower protective layer mining; with the relief stress, it is inverse--calculated out that the relief protection angle is 60 to 64.5°; the maximum amount of expansion deformation of the protected layer is 26.82mm, with the expansion deform- ation rate of 5.96 ‰, and the expansion deformation creates conditions for gas extraction in the protected layer.
出处
《中国煤炭》
北大核心
2012年第11期48-50,共3页
China Coal
关键词
远程下保护层开采
被保护层
膨胀变形率
应力分布
卸压效应
remote lower protective layer mining, protected layer, expansion deformationrate, stress distribution, relief effectiveness
