###
DOI:
地质力学学报:2009,15(3):253-261
本文二维码信息
码上扫一扫!
石灰岩和砂岩高温力学特性的试验研究
(1.长安大学地质工程与测绘学院,陕西 西安 710056;2.河南理工大学土木工程学院,河南 焦作 454003;3.河南理工大学材料科学与工程学院,河南 焦作 454003)
EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF LIMESTONE AND SANDSTONE UNDER HIGH TEMPERATURE
(1.College of Geology Engineering and Geomatics,Chang'an University,Xi'an,Shan'xi 710054,China;2.College of Civil Engineering,Henan Polytechnic University,Jiaozuo,Henan 454003,China;3.College of Material Science andEngineering,Henan Polytechnic University,Jiaozuo,Henan 454003,China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 1468次   下载 2724
投稿时间:2009-04-13    
中文摘要: 利用自行研制的岩石加温装置和RMT-150C岩石力学试验机,对石灰岩和砂岩试样高温后的力学特性进行了试验研究。试验结果表明,随着温度升高,两种岩石纵波波速逐渐减小。单轴压缩过程中的全程应力应变曲线经历了压密、弹性、屈服、破坏4个阶段;达到峰值应力后两种岩石均发生脆性破坏,砂岩破坏时呈锥形炸裂,而石灰岩则呈草捆状破坏。高温对两种岩石的强度都有一定的弱化作用,其峰值应力都随温度升高而降低,石灰岩700 ℃时强度降幅达84.59%,而砂岩强度仅比常温降低22%左右。两种岩石的峰值应变都随温度升高逐渐增大,但具体表现不尽相同,石灰岩500 ℃时应变增加了30.57%,500 ℃之后峰值应变基本无变化,甚至到700 ℃时还略有降低;砂岩700 ℃时峰值应变增加了80.63%,其峰值应变的变化与其微观结构变化相关。随着温度升高,两种岩石的弹性模量和变形模量均减小,700 ℃时石灰岩弹性模量降幅为86.8%,砂岩弹性模量降幅为46.94%;700 ℃时石灰岩变形模量下降了83.9%,砂岩的变形模量下降了53.06%。
Abstract:The mechanical properties of limestone and sandstone under high temperature were investigated by the experiment device used to heat rock designed by ourselves and servo-control testing machine RMT-150C.The results show that the longitudinal wave velocity of two kinds of rocks gradually reduced with temperature increasing.The complete curve of stress and strain under uniaxial compression went through 4 stages,namely densification,elasticity,yielding and failure.They both displayed brittle fracture after reaching peak strength,with the sandstone rupturing and the limestone showing failure like a bundle of grass.The high temperature weakened their strength.Their peak stresses reduced with temperature increasing.At 700 ℃,the peak strength of limestone decreased by 84.59%,while that of sandstone only decreased by 22%.Their peak strain increased with temperature increasing,but differed in details.For limestone,its peak strain increased by 30.57% at 500 ℃,but almost kept unchanged at the higher temperature,and even shaw a little decrease at 700 ℃.For sandstone,however,the peak strain increased by 80.63% at 700 ℃,displaying a connection with the variation of microstructure.With temperature increasing,their elastic modulus and deformation modulus decreased. At 700 ℃,limestone decreased by 86.8% in elastic modulus and by 83.9% in deformation modulus,while sandstone decreased by 46.94% in elastic modulus and by 53.06% in deformation modulus.
文章编号:     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(50274038,50574037)。
引用文本:
秦本东,何军,谌伦建,2009.石灰岩和砂岩高温力学特性的试验研究[J].地质力学学报,15(3):253-261.DOI:
QIN Ben-dong,HE Jun,CHEN Lun-jian,2009.EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF LIMESTONE AND SANDSTONE UNDER HIGH TEMPERATURE[J].Journal of Geomechanics,15(3):253-261.DOI:

用微信扫一扫

用微信扫一扫