全长锚杆的无损检测研究

RESEARCH ON NONDESTRUCTIVE DETECTION TECHNIQUE OF FULL-GROUTED BOLT

锚杆是地下工程及边坡工程施工中的一种重要手段,是一种隐蔽性的重要工程,因而对其进行质量检测是非常必要的。目前锚杆检测主要采用动测法。全长锚杆是目前应用较多的一种锚杆,对于全长锚固锚杆中锚固质量为优的锚杆来说,由于看不到底端反射,因而只能根据经验或依据能量衰减与锚固段长度呈指数关系,用测定能量衰减变化量来预测全长锚固锚杆的长度。全长锚固锚杆底反射变得很弱或消失,这是很有意义的信息,应进一步深入研究。目前锚杆的注浆饱和度测试仅处于定性或半定量的状态,不能精确定量地给出注浆饱和度值,但它对锚杆质量判断仍具有很高的实用性。更精确的定量判断还有待进一步的试验研究。

Bolt is a very important method for underground project. The construction of it is hidden, so it is needed to do detection. For excellent anchoring full-grouted bolt, there is no bottom reflection, so we can only determine the length of it according to experience or the exponential relation between the energy decay and the anchoring length. It is very significant that the bottom reflection becomes very weak or disappears, so there should be some further research. At present the detection of grouting saturation is only in qualitative or half quantitative state. But it is highly practical for bolt anchorage quality detection, and therefore there should be further research on more accurate quantitative detection.