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为分析底板巷道锚杆支护结构在采动压力作用下锚固段损伤机理及其承载模式,提高树脂锚杆支护在煤矿现场应用的可靠性,首先采用UDEC数值模拟软件模拟了上覆煤层开采对前方底板巷道的影响,分析了采动应力对顶、帮锚杆支护结构的作用响应;然后采用FLAC数值模拟软件模拟了树脂锚杆锚固段的承载及变形,得到了树脂锚杆在一定载荷和围压作用下动力响应;最后以混凝土试块模拟围岩,并在混凝土试块预留孔中锚固了树脂锚杆进行锚杆拉拔试验,并在拉拔同时采用弹性波无损检测仪进行锚杆无损动力检测。结果表明,树脂锚杆的锚固损伤是一种渐进式破坏过程,这种渐进式破坏和锚杆的有效锚固长度可以通过弹性波无损检测方法准确检测,并推断锚杆的实时承载力,从而提高树脂锚杆支护在煤矿现场应用的时效性。
In order to analyze the damage mechanism and bearing mode of anchorage section of roadway bolt support structure under mining pressure and improve the reliability of resin bolt support in coal mine site, the UDEC numerical simulation software was used to simulate the overlying coal seam mining The effect of mining stress on the roof and the supporting structure of bolting is analyzed. The FLAC numerical simulation software is used to simulate the bearing and deformation of the anchoring section of resin bolt. Load and confining pressure.Finally, the concrete test block simulates the surrounding rock, and anchors the resin bolt in the reserved hole of the concrete test block to carry out the anchor pull test. At the same time, the elastic wave nondestructive testing instrument Bolt nondestructive testing. The results show that the anchoring damage of resin anchors is a progressive failure process. This progressive failure and the effective anchoring length of anchors can be accurately detected by elastic wave non-destructive test and the real-time bearing capacity of anchors can be deduced Resin bolting support in the mine site application of timeliness.