| 安文博,王来贵*,杨建林,李喜林,潘纪伟.有机/酸复合溶液化学作用下低煤阶煤体破坏微观机制研究[J].实验力学,2018,33(6):969~978 |
| 有机/酸复合溶液化学作用下低煤阶煤体破坏微观机制研究 |
| Study on destruction micro-mechanism of low rank coal mass subjected to chemical action of organic/acid compound solution |
| 投稿时间：2017-08-31 修订日期：2017-10-18 |
| DOI：10.7520/1001-4888-17-179 |
| 中文关键词: 煤样 有机/酸复合溶液 微观机制 物理力学特性 |
| 英文关键词:coal samples organic/acid compound solution micro-mechanism physical and mechanical characteristics |
| 基金项目:国家自然科学基金(51474121)资助 |
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| 中文摘要: |
| 为了探讨有机/酸复合溶液化学作用对煤体物理力学特性的影响，采用扫描电镜、粉晶X射线衍射、压汞实验和力学性能测试等手段，对经有机/酸复合溶液浸泡前后的煤样表观形貌、矿物质含量变化、内部孔隙结构及单轴抗压强度进行表征。分析煤的微观结构随时间变化规律，得出有机/酸复合溶液破坏煤体的微观机制，并通过单轴压缩实验验证煤样微观破坏机理。结果表明：经有机/酸复合溶液浸泡48h后，煤样表面的孔隙尺寸大于10μm，大部分表面被溶蚀成小于1μm的小碎屑颗粒；方解石、白云石和黄铁矿的溶解率为54.54%、 36.36%、 34.29%，伊利石、高岭石、蒙脱石的含量增加了51.74%、 60%、 40%，石英几乎不反应；煤样孔径分布曲线随时间增加，逐渐由单峰分布变成双峰分布，煤样微孔体积减少了69.01%，大孔体积增加了72.85%；煤样弹性模量为377.2MPa，峰值强度为4.02MPa，达到峰值强度时，应变值为21.61%。煤样与有机/酸复合溶液之间的化学作用可从微细观上改变煤样的矿物组成与结构，使其产生孔洞、孔隙等，增加其孔隙率，影响其渗透率，进而改变其峰值强度和弹性模量等宏观力学性质。 |
| 英文摘要: |
| In order to investigate the effect of chemical action of organic/acid compound solution on the physical and mechanical characteristics of coal mass, scanning electron microscopy (SEM), powder X-ray diffraction (XRD), mercury injection experiment and mechanical properties measurement were adopted. The apparent morphology, mineral content change, internal pore structure and uniaxial compressive strength of coal samples before and after soaking in organic/acid compound solution were characterized. By analyzing coal mass micro-structure change with the time, the microscopic mechanism of coal destruction by organic/acid compound solution was obtained, and the microscopic failure mechanism of coal sample was verified by uniaxial compression experiment. Results show that after 48 hours soaked in organic/acid compound solution, the pore size on coal sample surface is larger than 10μm, and most of the surface is eroded into small clastic particle smaller than 1μm. The dissolution rates of calcite, dolomite and pyrite are 54.54%, 36.36% and 34.29%, respectively. The contents of illite, kaolinite and montmorillonite increase by 51.74%, 60%, 40%, respectively. Quartz is almost not reaction. The pore size distribution curve of coal sample gradually changes from single peak to double peak distribution with the time. The micropore volume of coal sample decreases by 69.01%, and the volume of large pore increases by 72.85%. The elastic modulus of coal sample is 377.2MPa. The peak strength is 4.02MPa. The strain value is 21.61 when the peak strength is reached. The chemical action between coal sample and organic/acid compound solution can change the mineral composition and micro-structure of coal sample, resulting in holes, pores, etc., increasing its porosity and affecting its permeability, and then changing the macroscopic mechanical properties such as peak strength and elastic modulus. |
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