锚杆与围岩加载过程中的红外热像实验研究

Experimental Study on Infrared Thermal Image of Bolt and Rock in Condition of Loading

应用红外热像技术,对锚杆与围岩加载变化破坏过程中的红外辐射现象进行了实验研究,结果表明:无锚杆试块红外辐射温度随着荷载增加,呈现整体均匀升温变化;试块布置锚杆后其承载能力增加,红外辐射温升也明显升高,应力峰值后,在锚杆周围形成一个由不同等温线组成的区域,由内向外,温度逐步降低,锚杆周围红外温度场与应力场,在形状和空间分布上有很好的相似性,红外热像高温区和低温区分别对应高应力区和低应力区。

The Infrared radiation experiments on bolt and rock in the process of loading were carried out. It was found that the infrared radiation temperatures of non-bolted block rose wholly and uniformly before stress peak with increase of loading . The sustaining ability of block increased after fixing bolt. The infrared radiation temperature also rose in evidence. The bolted rock presented local dissimilation in the thermal image after stress peak. The multi-layer round infrared radiation isothermal lines were formed around bolt. The more close from the bolt centre, the higher, the farther from the bolt centre, the lower temperature was. The temperature was gradually reduced from inside to outside. The change of infrared radiation temperature fields responded to stress fields around bolt.