单轴荷载作用下裂隙砂岩的红外辐射特征研究  

Study on the Infrared Radiation Characteristics of Pre-Flawed Sandstones under Uniaxial Loading

作　　者：徐奕 金克盛[1] 张科 张凯 Xu Yi;Jin Kesheng;Zhang Ke;Zhang Kai(Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,P.R.China;Faculty of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,P.R.China)

机构地区：[1]昆明理工大学电力工程学院,昆明650500 [2]昆明理工大学建筑工程学院,昆明650500

出　　处：《地下空间与工程学报》2025年第2期437-443,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(11902128,41762021);云南省应用基础研究计划项目(2019FI012)。

摘　　要：为探究单轴荷载作用下裂隙砂岩破裂引起的红外辐射效应,通过红外热成像技术实现试验全程温度场的非接触式观测,引入变异系数定量描述红外辐射温度场的演化规律以及前兆异常特征。结果表明:裂隙倾角控制着砂岩试件破坏模式和红外辐射特征;红外辐射温度场变异系数演化规律呈现出阶段性演化特征,与破坏模式密切相关;当试件发生剪破坏时,变异系数曲线表现为稳定型;当试件发生“H”型混合破坏时,变异系数曲线表现为下降型;变异系数加速上升分异阶段的起始点可视为试件破裂失稳前兆点。研究成果有助于深化对裂隙岩体破坏机制的认识,可为工程裂隙岩体灾变预测提供理论支撑。In order to explore the infrared radiation effect induced by the fracture of pre-flawed sandstones under uniaxial loading,the infrared thermal imaging technology was applied for a non-contact measurement of temperature field during the whole experiments.The coefficient of variation indicator is used to quantitatively described the evolution of the infrared radiation temperature field as well as the precursory anomaly characteristics.The results show that:The failure modes and infrared radiation characteristics of specimens are controlled by the variation of the flaw inclination.The coefficient of variation curves of infrared radiation temperature field exhibits phased evolution characteristics,which are closely related to the failure modes.The coefficient of variation curves are classified into stable type when it is a shear failure,and the curve represents descending type when it is an"H"type mixed failure.The starting point on acceleration differentiation stage of the coefficient of variation can be considered as a precursor point for specimen instability.The research results can deepen the knowledge of the failure mechanism,and provide a new theoretical basis for the catastrophic prediction of engineering fractured rock masses.

关 键 词：裂隙倾角 红外辐射温度场 力学性能 破坏模式 前兆 

分 类 号：TU45[建筑科学—岩土工程]