石灰岩和砂岩高温力学特性的试验研究

秦本东; 何军; 谌伦建

石灰岩和砂岩高温力学特性的试验研究

秦本东^{1, 2,},
何军²,
谌伦建³

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

基金项目:

国家自然科学基金资助项目 50274038

国家自然科学基金资助项目 50574037

详细信息

作者简介:
秦本东(1977-), 女, 讲师, 主要从事岩土工程方面的教学与研究工作。E-mail:qinbendong@hpu.edu.cn

中图分类号: TU452
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- 文章访问数: 170
- HTML全文浏览量: 84
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- 被引次数: 0
出版历程
- 收稿日期: 2009-04-13
- 刊出日期: 2009-09-28

EXPERIMENTAL RESEARCH ON MECHANICAL PROPERTIES OF LIMESTONE AND SANDSTONE UNDER HIGH TEMPERATURE

1.
College of Geology Engineering and Geomatics, Chang'an University, Xi'an, Shaan'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

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 %。
- 石灰岩 /
- 砂岩 /
- 高温 /
- 纵波波速 /
- 力学性质 /
- 单向约束条件
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.
- limestone /
- sandstone /
- high temperature /
- longitudinal wave velocity /
- mechanical properties /

HTML全文

图 1 不同温度后试件的照片

Figure 1. Pictures of samples after test at different temperatures

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图 2 高温加热系统

Figure 2. Heating system for high temperature

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图 3 纵波波速与温度的关系

Figure 3. Relationship between longitudinal wave velocity and temperature

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图 4 2种岩石单轴压缩全程应力-应变曲线

Figure 4. Complete curve of stress and strain of two kinds of rocks under uniaxial compression

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图 5 峰值应力与温度的关系

Figure 5. Relationship between peak-stress and temperature

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图 6 砂岩微观结构变化

Figure 6. Microstructure variation of sandston

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图 7 峰值应变与温度的关系

Figure 7. Relationship between peak-strain and temperature

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图 8 弹性模量、变形模量与温度的关系

Figure 8. Relationship between elastic modulus, deformation modulus and temperature

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