化学腐蚀灰岩SHPB冲击动力学性能研究

doi:10.13722/j.cnki.jrme.2018.0209

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摘要为探究化学腐蚀后灰岩的动态力学性能，首先配制3组不同pH值(pH = 3，7，11)的NaCl和KHSO4混合溶液并制备不同腐蚀损伤程度的灰岩试样，然后通过核磁共振测试获得腐蚀试样的孔隙率和MRI成像图，最后利用分离式Hopkinson 压杆装置开展冲击压缩试验。结果表明：灰岩损伤程度与溶液pH值关系密切，酸性溶液腐蚀损伤最为明显，损伤度变化范围最大(1.38%～2.02%)，碱性次之，中性环境岩性最为稳定；随腐蚀时间推移，灰岩孔隙率逐渐增大，从自然状态下的0.26%剧增到3.20%(酸腐蚀28 d)，其动态抗压强度和弹性模量以14 d为界呈现两阶段劣化特征，最大下降幅度分别高达36.6%和59.3%，破坏应变也相应增大。化学腐蚀灰岩的损伤程度与破裂块度分布分形维数都随腐蚀时间增加而增大，在酸、碱腐蚀环境下二者呈线性正比关系，而中性条件下则相关性不甚明显。

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	李光雷1
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	蔚立元1
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	靖洪文1
	张涛1
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关键词 ：岩石力学, 化学腐蚀, 灰岩, 分离式 Hopkinson 压杆, 损伤度, 动态力学性能

Abstract：In order to investigate the dynamic properties of limestone corroded in the chemical environment， three groups of chemical solutions with different pH values were firstly prepared to corrode limestone specimens for different time periods. Then，the porosity and magnetic resonance image of corroded specimens were obtained using the nuclear magnetic resonance(NMR) test. The impact dynamic properties of corroded specimens were finally tested with the split Hopkinson pressure bar(SHPB) system. The experimental results show that the damage degree of limestone is closely related to the pH value of chemical solutions. The specimens corroded in the acid solution are much more seriously damaged than those in the alkaline and neutral solutions. The damage degree of acid-corroded specimens varies from 1.38% to 2.02%. The porosity and the failure strain of limestone specimens increase with the corrosion time. Specifically，the porosity increases dramatically from 0.26%(in the natural state) to 3.20%(after 28 d acid corrosion). Consequently，the dynamic compressive strength and elastic modulus both decrease in two stages separated by a critical time(14 d)，and the maximal percentages of reduction are up to 36.6% and 59.3%，respectively. The damage degree and the fragment-distribution fractal dimension of limestone specimens both increase with the corrosion time，and there is a linear positive correlation between them in the acid and alkaline environments. However，this correlation between the damage degree and the fractal dimension is not obvious in neutral environment.

Key words： rock mechanics chemical corrosion limestone SHPB damage degree dynamic properties

引用本文:

李光雷1，2，蔚立元1，苏海健1，靖洪文1，张涛1，2. 化学腐蚀灰岩SHPB冲击动力学性能研究[J]. 岩石力学与工程学报, 2018, 37(9): 2075-2083.
LI Guanglei1，2，YU Liyuan1，SU Haijian1，JING Hongwen1，ZHANG Tao1，2. Dynamic properties of corroded limestone based on SHPB. , 2018, 37(9): 2075-2083.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0209 或 http://www.rockmech.org/CN/Y2018/V37/I9/2075

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