摘要
以山西晋城地区首个综采放顶煤沿空留巷为研究背景,对沿空留巷二次回采过程中的巷道变形、顶帮压力变化进行系统分析,得出无煤柱开采过程中的矿压变形规律:①沿空留巷回采时巷道变形以顶底板移近量为主,其中顶板鼓起为主要变形,两帮变形以煤帮上侧鼓出为主;②沿空留巷推进前200 m时,巷道压力区域主要表现在超前支护20 m范围内,推进300~450 m段时,矿压显现最为明显,巷道压力区域主要表现在距煤壁50 m范围内;③沿空留巷推进过程中,煤帮侧压力首先增加,顶板压力主要表现在直接顶和老顶传递的压力;④通过沿空留巷矿压分析,回采推进时必须采取防止帮锚杆射出的有效措施,且防护范围需在距煤壁40 m范围内。
The first fully mechanized top caving face along gob-side entry in Jincheng was taken as a example,the channel deformation and the roof pressure change during the secondary recovery mining of gob-side entry were systematically analyzed,the mining pressure deformation law was got.①The main deformation of the roadway was the displacement of the roof and floor during the recovery,the deformation of the two sides was mainly the bulging of the upper side.②In the first 200 m of goaf roadway mining,the roadway pressure area was mainly within the range of 20 m in advanced support.In the 300~450 m section advancing,the mine pressure was the most obvious,and the roadway pressure area was mainly within the range of 50 m from the coal wall.③In the process of goaf entry retention driving,the lateral pressure of coal wall increased first,and the roof pressure was mainly manifested in the pressure transmitted by the direct roof and the old roof.④According to the mine pressure analysis of gob-side entry retention,effective measures must be taken to prevent the side bolt,and the protection range should be within 40 m from the coal wall.
作者
王盖克
Wang Gaike(Shanxi Lanhua Group Dongfeng Mining Corporation Ltd.,Jincheng 048000,China)
出处
《煤炭与化工》
CAS
2021年第6期24-27,共4页
Coal and Chemical Industry
关键词
沿空留巷
二次回采
矿压
底鼓
gob side entry
secondary mining
mining pressure
bottom drum
