- 期刊
紅外線熱影像分析探討礦場爆破岩體損傷檢測—以花蓮和平地區露天礦場為例
Use Infrared Thermal Graph Technology to Analysis the Rock Mass Degree of Damage after Blasting in Open Pit Mine
摘要
本研究遂提出以紅外線熱影像分析來檢測爆破後周邊岩體之損傷範圍及程度可行性分析，期望能以此一檢測分析技術在未來能提供露天採礦施工爆破作業後採台周邊岩體受損程度資料作為施工作業之參考及改善爆破設計降低岩體破壞之程度。紅外線為屬於電磁波譜上波長為0.75 ~10μm之電磁波，舉凡物體溫度大於.對溫度時皆會輻射紅外線，且不同溫度所輻射之紅外線能量亦不同。而物體所能輻射紅外線能量之大小則與物體本身表面材質、表面狀況特性、溫度及波長等條件有關。大部分的紅外線熱影像儀器即針對具有較好穿透率之3 ~ 5μm（短波）及812μm（長波）兩個波段之電磁波進行偵測，並將偵測所得之訊號轉換成可供人視覺辨識之影像圖形，並可進一步計算出溫度分佈值。由於露天礦場爆破作業後其採台階段面之溫度變化可能與岩體內之節理裂隙、自由面、孔洞、礦場階段面形勢、炸藥量及含水狀況有關，因此可藉由測得溫度之分佈，配合影像、地質參數等資料，可以推測得到爆破後其後方之岩石表面剝離、內部裂隙及內部孔洞等資訊。此一資訊即可用於分析爆破作業之炮孔排列設計、裝藥數量、發爆延遲時間等爆破參數與岩體破壞之相互關係。
並列摘要
Infrared thermography is an efficient tool for surface temperature measurement. In principle, heat transfer in any material is affected by the change in material thermal properties. Localized temperature differences on the surface, which may be caused by the subsurface defects, can be found based on the images produced by an infrared camera.Drilling and blasting is the most widely used method in the excavation of open pit mine. Drilling and blasting using high explosive that produce shock wave and high pressure and temperature gas to break and heave the rock. Even under precise design delay to reduce the vibration, the shock wave will damage the surround rock. The damaged rock masswill result in uncertainty of following operation and support. Therefore, the non-destructive examination of the rock mass and evaluate its degree of damage become a very important issue.The purpose of this research is to explore the use of infrared thermography technology to evaluate the degree of damage of the surrounding rock mass after blasting operation. The high temperature gas intrude into the cleavage of the rock mass will increase the temperature of the rock and thus should be able to provide useful data for rock mass damage analysis.