高预紧力全长锚固锚杆工况监测  

Monitoring and Measuring on Performances of High Pre-Tensioned Full Length Anchoring Bolt

作　　者：刘爱卿[1,2] 鞠文君[1,2] 衣宪章[1,2] 

机构地区：[1]煤炭科学研究总院开采研究分院,北京100013 [2]天地科技股份有限公司开采设计事业部,北京100013

出　　处：《煤炭工程》2012年第3期53-55,共3页Coal Engineering

基　　金：国家科技支撑计划课题(2008BAB36B07);天地科技工艺技术创新项目:弱胶结软岩巷道钻孔孔底快速扩孔锚固技术研究(KJ-JJ-2011-KCSJ-05)

摘　　要：通过对常用的测力锚杆改进,开发了能够监测高预紧力全长锚固锚杆受力状况的CM-200Ⅰ型测力锚杆,并进行了实验室标定。同时开发出适用于测力锚杆施加扭矩的扭矩套筒,更好地实现了对高预应力全长锚固锚杆的实际工况监测。将改进后测力锚杆应用于井下,通过监测结果可知:高预紧力全长锚固锚杆的载荷在施加预紧力后沿杆体均匀分布,围岩变形后,在距锚杆尾部500mm处出现中性点,此处轴力最大,剪应力为零,充分发挥了锚杆的支护性能。With an improvement on the conventional force measuring bolt, a CM -200 I type force measuring boh was developed to monitor and measure the stressed conditions of the high pre - tensioned full length anchoring bolt. A lab rating was conducted. Meanwhile, a torque socket to suitably add the torque to the force measuring bolt was developed and thus a actual performance monitoring and measuring of the high pre - stress full length anchoring bolt could be well conducted. The improved force measuring bolt was applied to the underground mine. The monitoring and measuring results showed that after the pre - tension made, the load on the high pre - tension full length anchoring bolt would be evenly distributed along the bar of the bolt. When the surrounding rock deformed, there would be a neutral point occurred at the 500mm to the bolt real end. A shaft force at the location would be max and the shearing stress would be zero. The support performances of the bolt could be fully played.

关 键 词：测力锚杆 高预紧力 全长锚固 锚杆支护 

分 类 号：TD353.6[矿业工程—矿井建设]