不同煤层倾角锚杆支护围岩位移变化规律研究

Study on the change laws of surrounding rock displacement of rock bolt supported with different coal seam angles

当煤层倾角发生变化时,顶板锚杆需要最佳的支护角才能达到最好的支护效果。当顶板锚杆支护角变化时,顶板垂直方向位移、两帮位移和底鼓都发生变化。在FLAC3D数值模拟的基础上,分析研究了10°~18°的煤层倾角下顶板和两帮位移以及底鼓的变化规律。结果表明,当煤层倾角为10°~18°时,顶板位移和两帮位移之间、两帮水平方向位移之间、顶板垂直方向位移和底鼓之间都没有明显的相关性;两帮位移标准差具有很强的同步性;顶板位移标准差和底鼓标准差在煤层倾角10°~14°之间具有同步性,在14°~18°具有反向同步性;91°~93°的顶板锚杆支护角是顶板锚杆最佳支护角的最佳区间。

When the inclination of coal seam changes, the roof bolt needs an optimum angle of deflection to achieve the best support effect . When the deflecting angle of roof bolt changes, the displacement of the surrounding rock roof, roadway sides and floor changes too. On the basis of FLAC3D numerical simulation, the variation rule of the surrounding rock＇s displacement with coal seam incliaation of 10 to 18 degree was analyzed and studied. The results showed that when the coal seam inclination was 10 to 18 degree, there was no relevance between vertical displacement of roof, bilateral displacement of roadway sides and floor dis placement. The standard deviation of bilateral surrounding rock displacement had a strong synchronicity. The standard deviation of floor displacement and roof displacement had a synchronicity when coal seam inclination was 10 to 14 degree and had a ＂back- ward synchronicity when coal seam inclination was 14 to 18 degree. 91 to 93 degree was the optimum range for the best support angle of roof bolt.