高温环境下大理岩热损伤特性的试验研究  

Experimental Research on Thermal Damage Properties of Marble at High Temperature

作　　者：张连英[1,2] 茅献彪[1] 李天珍[2] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008 [2]徐州工程学院数理学院,江苏徐州221008

出　　处：《采矿与安全工程学报》2010年第4期505-511,共7页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2007CB209400);国家自然科学基金重大项目(50634050);江苏省高校自然科学基础项目(08KJD130003);江苏省创新学者攀登项目(BK2008007);江苏省研究生培养创新工程项目(CX09B_108Z);国家自然科学基金项目(51074166);江苏省"青蓝工程"项目;徐州工程学院校级培育项目(XKY2010102)

摘　　要：采用MTS 810电液伺服材料试验系统对常温~800℃高温作用下大理岩的力学性能进行了研究,考察了大理岩的全应力-应变曲线、峰值应力、弹性模量等量的变化特征.结果表明：随受热温度升高大理岩的峰值强度和弹性模量不同程度上渐次降低,尤其是在不同温度段岩石强度降低具有突变性,800℃时大理岩的延性明显增强.基于岩石的应变强度理论和岩石强度的随机统计分布假设,采用损伤力学理论,考虑微元体破坏及弹性模量与温度之间的非线性关系,建立了单轴压缩下的大理岩损伤统计本构模型,给出了考虑温度效应大理岩损伤统计本构模型参数.通过与高温状态下单轴压缩实验结果相比较,显示了所建模型的合理性。最后探讨了温度对大理岩损伤特性的演化规律.The mechanical properties of marble were studied using the MTS 810 rock mechanics servo-controlled testing system at 800°C.This was done to analyze the stress-strain curve,peak stress,modulus of elasticity of marble.The results show that the peak stress and elastic modulus decrease with the increase of temperature in different degrees,especially the rock mechanical strength will decrease suddenly in different intervals of temperature.Marble ductility increases greatly at 800°C.Based on the strain strength theory and the random statistical distribution hypothesis of rock strength,a statistical constitutive model for rock damage under uniaxial compression,in which the nonlinear relation of unit volume failure or elastic modulus and the temperature are taken into consideration,is established by adopting the damage constitutive theory of continuous medium and then the parameters for statistical damage constitutive model of marble considering temperature effect are given.The achieved theoretical curves by the damage model of marble are in good agreement with the experimental results.Finally,the evolution law of marble on the damage properties is discussed.

关 键 词：大理岩 高温作用 热损伤 应变能释放率 

分 类 号：TD313[矿业工程—矿井建设]