| 长石砂岩对酸性环境的腐蚀劣化响应 |
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| 引用本文： | 周斌,张东明,许江,程亮,李嘉欣.长石砂岩对酸性环境的腐蚀劣化响应[J].煤田地质与勘探,2020,48(4):165-173. |
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| 作者姓名： | 周斌 张东明 许江 程亮 李嘉欣 |
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| 作者单位： | 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400030;重庆大学ICT研究中心,重庆400030 |
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| 基金项目： | 国家科技重大专项;国家自然科学基金;国家自然科学基金 |
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| 摘 要： | 为了揭示酸性环境对岩石的腐蚀劣化效应,利用CT图像处理技术分析经酸性水域浸泡后长石砂岩的细观组分及结构变化,并利用岛津AGI–250伺服材料试验机开展单轴压缩试验,观察其力学参数劣化情况。试验结果表明:经酸性水域处理后,长石砂岩试件其总体密度降低、分布趋向均一化,局部区域生成了更高密度的矿物成分;次生孔隙增多,试件外部孔隙变化可直观看到,内部孔隙变化可通过最小外接矩形像素面积直接反映;抗压强度、弹性模量、峰值应变最大下降量分别达34.092%,22.016%和13.705%,且反映砂岩强度参数的劣化度相对较高,应变参数的劣化度相对较低;酸性水域中H+浓度充足时,砂岩在酸性溶液中主要以溶解反应为主,H+浓度降低到一定程度后,正长石和斜长石溶解的同时可生成其他自生矿物,当H+消耗殆尽后,反应主要以水解的方式进行。通过将CT图像处理技术运用于经酸性水域处理后砂岩的力学特性变化机理分析,为研究类似岩石等非均质材料的组成及性质提供一种新思路和新方法。
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| 关 键 词： | 长石砂岩 酸性水域 CT图形处理 力学特性 劣化规律 |
| 收稿时间： | 2019-11-13 |
Corrosion and degradation of feldspar sandstone in acidic environment |
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| ZHOU Bin,ZHANG Dongming,XU Jiang,CHENG Liang,LI Jiaxin.Corrosion and degradation of feldspar sandstone in acidic environment[J].Coal Geology & Exploration,2020,48(4):165-173. |
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| Authors: | ZHOU Bin ZHANG Dongming XU Jiang CHENG Liang LI Jiaxin |
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| Institution: | (State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400030,China;ICT Research Center,Chongqing University,Chongqing 400030,China) |
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| Abstract: | In order to study the effect of acidic environment on the corrosion and deterioration of rocks, CT images processing technology was used to analyze the meso-composition and structural changes of feldspar sandstone after soaking in acidic water. Shimadzu AGI-250 servo material testing machine was used to carry out uniaxial compression test to observe the deterioration of mechanical parameters. The results show that the total density of the feldspar sandstone decreased Ofter the acidic environment treatment, the distribution trend is homogeneous, and the mineral with higher density is formed in the local area. The secondary pores of the feldspar sandstone increased after the acidic environment treatment. The change of the external pore could be seen directly. The internal pores changes could be directly reflected by the minimum circumscribed rectangle area. The maximum decrease in compressive strength, elastic modulus, and peak strain of feldspar sandstone treated in acid water reached 34.092%, 22.016%, and 13.705% respectively. The degradation degree of the strength parameters was higher than that of the deformation parameters. When there was sufficient H+ in acidic water, the dissolution reaction of sandstone in acidic solution was mainly. After the H+ was reduced to a certain extent, orthoclase and plagioclase dissolved, and other authigenic minerals could be formed. When H+ was consumed, the reaction proceeded mainly by hydrolysis. By applying the combination of CT images processing technology to the mechanism analysis of mechanical properties of sandstone after acid environment treatment, a new idea and method for studying the composition and properties of heterogeneous materials such as rock is provided. |
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| Keywords: | feldspar sandstone acidic environment CT images processing mechanical properties deterioration law |
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