含孔岩石加载过程的热辐射温度场变化特征  

Thermal radiation temperature field variation of hole rock in loading process

作　　者：张艳博[1] 刘善军[2] 

机构地区：[1]河北理工大学资源与环境学院,河北唐山063000 [2]东北大学资源与土木工程学院,沈阳110819

出　　处：《岩土力学》2011年第4期1013-1017,1024,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金面上项目(No.50774017);河北省自然科学基金项目(No.E2008000410)

摘　　要：选择含圆孔岩石作为试样,利用单轴加载试验系统和红外热像仪,并结合数值模拟分析手段,对模型受力及破裂过程的热辐射时空演化特征进行了试验研究。结果表明:含圆孔岩石在加载过程中压、拉应力呈对称分布,导致热像的升温和降温区对称分布,即压应力区升温,拉应力区降温,应力场与红外辐射温度场之间呈很好的对应关系。试件加载后期发生破裂,破裂的性质与红外辐射温度变化有密切关系,剪性破裂辐射温度升高,而张性破裂辐射温度无明显变化。试件最终呈剪性破裂,而该区域的带状升温是岩石破裂失稳的重要红外前兆。试验结果再次揭示,利用热成像技术可以监测岩石的应力与灾变现象。The hole rock is selected as a spesimen, and the thermal infrared radiation variation features of hole rock are experimentally studied in the process of loading by using uniaxial loading system and thermal imager, as well as combining the numerical simulation. It is revealed that the distribution of compression stress and tension stress on hole rock are symmetrical, which results in the symmetrical distribution of thermal image. The surface radiation temperature in tension stress area decreases and the radiation temperature in compression stress area increases. There is a fine corresponding relation between stress field and infrared radiation temperature field. In the later period of loading, rock appears fractures and the radiation temperature on shearing fracture is increasing; but the radiation temperature on the position of tension fracture is almost not changed. The fracturing type is closely related to the infrared radiation temperature variation. The rock fails finally along the shearing fracture; and the temperature-increase strip is the important infrared precursor of rock fracture and destabilization. The experimental results indicate again that the thermal imaging technology can detect the stress and catastrophe of rock.

关 键 词：含孔岩石 破裂 红外辐射 灾变监测 

分 类 号：TU45[建筑科学—岩土工程]