浅煤层联合开采矿压规律研究

Study on combined mining pressure law of shallow coal seam

利用现场实测法对错距为20 m的上下煤层工作面进行矿压观测分析,通过观测数据可知,上煤层因为采高小、顶板坚硬,在工作面回采时没有明显的初次来压和周期来压,在回采工作面前方20 m范围内为超前影响剧烈区,工作面巷道围岩塑性区深度为1.5~2.5 m;下煤层工作面初次来压和平均周期来压步距分别为27.4 m和15.5 m,回采工作面前方30 m范围内为超前剧烈影响区,工作面巷道围岩塑性区深度2 m。

Pressure observation of alternative distance of 20 m of upper and lower coal seam working face was analyzed by test method on the site, the observed data showed that upper coal seam with tough roof due to small mining height, without obvious initial pressure and periodical pressure, advanced interfered area ahead of 20 m of working face, with working face roadway surrounding rock plastic zone depth of 1.5~2.5 m. Initial pressure and average periodical pressure step of lower coal seam working face were 27.4 m and 15.5 m, advanced interfered area ahead of working face 30 m, with working face roadway surrounding rock plastic zone depth of 2 m.