Properties of failure mode and thermal damage for limestone at high temperature  

作　　者：MAO Xian-biao ZHANG Lian-ying LI Tian-zhen LIU Hai-shun 

机构地区：[1]School of Sciences, China University of Mining ＆ Technology, Xuzhou, Jiangsu 221008, China [2]State Key Laboratory of Geomechanics and Deep Underground Engineering, China University of Mining ＆ Technology, Xuzhou, Jiangsu 221008, China [3]School of Mathematics and Physical Science, Xuzhou Institute of Technology, Xuzhou, Jiangsu 221008, China

出　　处：《Mining Science and Technology》2009年第3期290-294,共5页矿业科学技术（英文版）

基　　金：Projects 50490273 supported by the National Natural Science Foundation of China;2007CB209400 by the National Basic Research Program of China;08KJD130003 by the Basic Research Program of University in Jiangsu Province;XKY2007219 by Xuzhou Institute of Technology

摘　　要：The mechanical properties of limestone such as the stress-strain curve, the variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the action of temperatures ranging from room temperature to 800 °C.Our results show that:1) the temperature has not clear effect on the mechanical properties of limestone from room temperature to 600 °C.However, the mechanical properties of limestone deteriorate rapidly when the temperature is above 600 °C.In this case, the peak stress and modulus of elasticity decrease rapidly.When the temperature reaches 800 °C, the entire process, showing the stress-strain curve is displayed indicating an obvious state of plastic-deformation;2) the failure mode of limestone shows the breakdown of tensile strength from room temperature to 600 °C, as well as the compress shearing damage over 600 °C;3) combining our test results with the concept of thermal damage, a thermal damage equation was derived.The mechanical properties of limestone such as the stress-strain curve, the variable characteristics of peak strength and the modulus of elasticity of limestone were studied under the action of temperatures ranging from room temperature to 800 °C.Our results show that：1） the temperature has not clear effect on the mechanical properties of limestone from room temperature to 600 °C.However, the mechanical properties of limestone deteriorate rapidly when the temperature is above 600 °C.In this case, the peak stress and modulus of elasticity decrease rapidly.When the temperature reaches 800 °C, the entire process, showing the stress-strain curve is displayed indicating an obvious state of plastic-deformation;2） the failure mode of limestone shows the breakdown of tensile strength from room temperature to 600 °C, as well as the compress shearing damage over 600 °C;3） combining our test results with the concept of thermal damage, a thermal damage equation was derived.

关 键 词：LIMESTONE high temperature effect mech-anical properties clamage 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TQ172.41[金属学及工艺—金属材料]