高预紧力全长锚固锚杆工况监测

 通过对常用的测力锚杆改进，开发出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，更好的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。并且根据巷道表面位移监测结果知高预紧力全长锚固锚杆有效的控制了顶板的变形，充分发挥了锚杆的支护性能

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

With an improvement on the conventional force measuring bolt,a CM-200 I type force measuring bolt 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.