不同温度热处理石灰岩的物理力学性质试验研究

doi:10.13722/j.cnki.jrme.2017.0932

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摘要

对5种不同产地的石灰岩在常温和经历100 ℃～800 ℃不同温度热处理后的物理力学性质进行试验研究，通过扫描电镜分析不同温度热处理后的石灰岩的细观特征，探讨高温后石灰岩的体积密度、孔隙度、纵波波速、弹性模量、抗拉和抗压强度的变化情况，以及纵波波速与力学参数的对应关系，比较基于弹性模量、抗压强度、抗拉强度的损伤因子与超声法得到的损伤因子的相关性，并对石灰岩高温劣化的影响因素进行分析。结果表明：随着温度的升高，岩石的内部缺陷增大，体积密度、纵波波速、弹性模量、抗拉和抗压强度逐渐降低，孔隙度逐渐升高。这是由于热应力的产生导致裂隙发育，最终表现为力学性质的劣化；随着波速的增大，岩石的抗压与抗拉强度和弹性模量均随之增大。纵波波速与力学参数之间的相关性良好，可利用超声波法估算岩石力学参数；随着加热温度的升高，岩样的损伤因子逐渐增大。基于弹性模量、抗压强度、抗拉强度的损伤因子与超声法得到的损伤因子有较好的相关性；5种来自不同地区的石灰岩表现出了不同物理力学特性，这与岩石本身的矿物成分、构造以及成岩作用有关。

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	陈宇龙1
	张玉2

关键词 ：岩石力学, 石灰岩, 高温, 细观结构, 纵波波速, 损伤因子, 物理力学性质

Abstract：

The physical and mechanical behavior of limestone，retrieved from five different places，exposed to temperatures up to 800 ℃ has been investigated experimentally at laboratory scale. Scanning electron microscope (SEM) experiments were conducted for observations of the microscopic structure. Uniaxial compressive and Brazil split testing and other measurements of geometric and bulk density changes were performed on the specimens after thermal treatment. The compressional wave velocity is correlated to mechanical parameters. Damage factors based on elastic modulus，compressive strength and tensile strength are compared with that from compressive wave velocity. Effect factors of degradation of limestone subjected to high temperature are discussed. Results show that internal defects of samples increase gradually with temperature. Compared to untreated specimens，as the temperature increases，bulk density，compressive wave velocity，elastic modulus，tensile and compressive strength reduce，while the porosity increases by both inducement of new cracks and development of existing cracks. Compressive strength and tensile strength and elasticity modulus increase with increasing compressive wave velocity which correlates well with mechanical parameters. Hence the compressive wave velocity could be used as an effective alternative for estimating the mechanical parameters of rock. Damage factor increases with increasing temperature. Strong correlations between damage factors based on elastic modulus，compressive strength and tensile strength and compressive wave velocity are found. Limestone samples from five different places show different physical and mechanical properties as a result of different mineral composition， structure and diagenesis.

Key words： rock mechanics limestone high temperature microscopic structure compressive wave velocity damage factor physical and mechanical behaviour

引用本文:

陈宇龙1，张玉2 . 不同温度热处理石灰岩的物理力学性质试验研究[J]. 岩石力学与工程学报, 2017, 36(S2): 3732-3739.
CHEN Yulong1，ZHANG Yu2. Experimental study of physical and mechanical behavior of limestone subjected to different heat treatment temperatures. , 2017, 36(S2): 3732-3739.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.0932 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS2/3732

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