Experimental study on shear strength characteristics of limestone under acidizing corrosion

被引：0
|
作者：
Liao J. [1 ]
Zhao Y. [2 ]
Liu Q. [1 ]
Tang L. [1 ]
机构：
[1] School of Resource& Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, 411201, Hunan
[2] Work Safety Key Laboratory on Prevention and Control of Gas and Roof Disasters for Southern Coal Mines, Hunan University of Science and Technology, Xiangtan, 411201, Hunan
来源：
Zhao, Yanlin (yanlin_8@163.com) | 1600年 / China University of Mining and Technology卷 / 37期
关键词：
Chemical etching; Direct shear test; Rock mechanics;
D O I：
10.13545/j.cnki.jmse.2020.03.024
中图分类号：
学科分类号：
摘要：
With the limestone samples from Taiping Qianchang Copper-iron Mine in Anhui province as the research object, the shear strength characteristics of the rock specimens have been studied by soaking them in weak acid solutions with different pH values, and the characteristics of shear stress- displacement curve at different stages in the process of direct shear failure and the differences of shear strength characteristics under different stress conditions have also been revealed. The results have shown that when the limestone specimens immersed in the same pH solution for the same length of time, the shear strength τ will increase with the increase of normal stress σ. The shear strength of limestone specimens decreased with the increase of immersion time and the decrease of pH. The change in the mineral composition and even the internal structure of the rock due to chemical corrosion is the fundamental reason for the change of mechanical properties of limestone. The attenuation rate of shear strength, cohesion C and internal friction angle φ of limestone specimens soaked for 0~3 d is higher than the limestone specimens soaked for 3~6 d. © 2020, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：639 / 646
页数：7
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