高温后无烟煤静动态压缩力学特性研究

doi:10.13722/j.cnki.jrme.2017.1169

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摘要为探究温度对煤岩静、动态力学特性的影响规律，首先采用箱式氛围炉在准真空环境下对直径50 mm，高度分别为100和50 mm的2组无烟煤试样进行8种温度水平的热处理(20 ℃～500 ℃)，然后分别利用液压伺服试验机和分离式Hopkinson压杆对2组试样进行静态单轴压缩和动态冲击试验。此外，还通过扫描电镜和压汞试验获得各种温度后煤样的SEM图像、孔隙率及孔径分布。结果表明，煤样热损伤以300 ℃为界分为2个阶段，分别以解吸、热破裂等物理反应和热解化学反应为主，孔隙率逐步变大且中大孔占比逐渐增加；煤岩承载和抗变形能力都随温度升高而逐步劣化，第二阶段衰减趋势较第一阶段急剧，500 ℃后的静、动态抗压强度分别降至常温时的8.41%和16.94%。静载条件下煤样宏观力学性能的温度敏感性比动态冲击时显著，抗压强度和弹性模量的动态增强因子随温度的变化规律不一致。

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	蔚立元1
	李光雷1
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	苏海健1
	靖洪文1
	张涛1
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关键词 ：岩石力学, 无烟煤, 静力学特性, 动力学特性

Abstract：In order to investigate the mechanical properties of coal after thermal treatment， two sets of anthracite samples with different aspect ratios in a box-type muffle furnace were firstly prepared and heated subsequently under temperatures from 20 ℃ to 500 ℃. The static uniaxial compression and dynamic impact tests were then conducted using the hydraulic servo testing machine and split Hopkinson pressure bar(SHPB) system respectively. The microstructure images，the porosity and the pore size distribution of typical samples were obtained using the scanning electron microscope(SEM) and mercury intrusion porosimetry(MIP). The experimental results show that the temperature range can be divided into two stages by a critical value of 300 ℃. The physical reactivity and pyrolysis play the main roles in Stages 1 and 2 respectively. The porosity of coal and the proportion of super micropores and micropores increase gradually with temperature. The bearing and anti-deformation capacities of anthracite decrease with temperature，and the tendency is more obvious in stage 2 than in Stage 1. The static and dynamic compressive strengthes at 500 ℃ are only 8.41%/16.94% of those in the natural state. The static mechanical properties are more sensitive to the temperature than the dynamic properties due to the effect of strain rate. The variations in dynamic increasing factors of the compressive strength and elastic modulus are different.

Key words： rock mechanics anthracite static mechanical properties dynamic properties

引用本文:

蔚立元1，李光雷1，2，苏海健1，靖洪文1，张涛1，2. 高温后无烟煤静动态压缩力学特性研究[J]. 岩石力学与工程学报, 2017, 36(11): 2712-2719.
YU Liyuan1，LI Guanglei1，2，SU Haijian1，JING Hongwen1，ZHANG Tao1，2. Experimental study on static and dynamic mechanical properties of anthracite after high temperature heating. , 2017, 36(11): 2712-2719.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1169 或 http://www.rockmech.org/CN/Y2017/V36/I11/2712

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