SDS水溶液作用下低煤阶煤体物理力学特性及损伤实验研究
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摘要
为了探究SDS水溶液对低阶煤煤体物理力学特性的影响及损伤程度,采用十二烷基硫酸钠(SDS)水溶液为有机溶液,以低煤阶煤体(阜新长焰煤)为研究对象,通过电镜扫描、压汞实验、纵波波速实验和单轴压缩实验,对SDS水溶液浸泡前后煤样的微观孔隙结构、孔隙率、纵波波速、峰值强度及弹性模量进行表征,分析煤样在SDS水溶液作用下物理力学特性随浸泡温度的变化规律,并建立了SDS水溶液作用下受荷载煤样的损伤演化模型,探讨煤样损伤机制。结果表明:(1)经SDS水溶液作用后,煤样微观孔隙分布不均匀,孔隙率随浸泡温度增加而增加,在55℃时,孔隙率为57%,比原煤样孔隙率增加了46%;煤样纵波波速、峰值强度和弹性模量均随浸泡温度增加而降低,在55℃时,纵波波速、峰值强度和弹性模量分别为571m/s、6.73MPa、356MPa,比原煤样分别降低了416m/s、5.12MPa、1129MPa;(2)SDS水溶液与荷载的共同作用加剧了煤样的总损伤程度,表现出明显的非线性特征,煤样损伤在微观上表现为矿物质组成与结构的改变过程,宏观上表现为煤样力学强度的降低及抵抗破坏的能力减弱;(3)运用新的浸泡实验结果验证所提出的损伤演化模型,实验结果与损伤演化模型十分吻合,相关系数R~2=0.999,由此可见,该损伤演化模型具有良好的可靠性。
In order to investigate the effect of SDS aqueous solution on the physical and mechanical characteristics and the damage degree of low-rank coal,adopting sodium dodecyl sulfate(SDS) aqueous solution as organic solution, and low rank coal body(Fuxin long flame coal) as study object, through scanning electron microscope(SEM), mercury injection experiment, longitudinal wave velocity experiment and uni-axial compression experiment, the microscopic pore structure, porosity, longitudinal wave velocity, peak strength and elastic modulus of coal samples were characterized before and after soaking in SDS aqueous solution; the variation pattern of physical and mechanical properties of coal samples subjected to action of SDS aqueous solution was analyzed with the variation of immersion temperature; the damage evolution model of loaded coal sample subjected to action of SDS aqueous solution was established, and the damage mechanism of coal sample was discussed. Results show that(1) After immersion in SDS aqueous solution, the micro pore distribution is not uniform, the total porosity of coal samples increases with the increase of soaking temperature; when temperature is 55℃, the total porosity of coal samples is 57%, which is increased by 46% compared with the total porosity of raw coal sample; the longitudinal wave velocity, peak intensity and elastic modulus of coal samples decline with the increase of soaking temperature, the longitudinal wave velocity, peak intensity and elastic modulus are 571 m/s, 6.73 MPa, 356 MPa, respectively, compared with the raw coal sample were reduced by 416 m/s, 5.12 MPa, 1129 MPa;(2) The combination of SDS aqueous solution and load that intensification the total damage degree of coal samples,showing a distinct non-linear characteristic,the damage of coal samples is microscopic manifestation of the change process of mineral composition and structure, and the macroscopic manifestation is the decrease of the mechanical strength of coal samples and the weakening of resistance to damage.(3) Using the results of new immersion experimental to verify the damage evolution model,the experimental results are in good agreement with the damage evolution model,correlation coefficient is 0.9999. It can be seen that the damage evolution model has good reliability.
In order to investigate the effect of SDS aqueous solution on the physical and mechanical characteristics and the damage degree of low-rank coal,adopting sodium dodecyl sulfate(SDS) aqueous solution as organic solution, and low rank coal body(Fuxin long flame coal) as study object, through scanning electron microscope(SEM), mercury injection experiment, longitudinal wave velocity experiment and uni-axial compression experiment, the microscopic pore structure, porosity, longitudinal wave velocity, peak strength and elastic modulus of coal samples were characterized before and after soaking in SDS aqueous solution; the variation pattern of physical and mechanical properties of coal samples subjected to action of SDS aqueous solution was analyzed with the variation of immersion temperature; the damage evolution model of loaded coal sample subjected to action of SDS aqueous solution was established, and the damage mechanism of coal sample was discussed. Results show that(1) After immersion in SDS aqueous solution, the micro pore distribution is not uniform, the total porosity of coal samples increases with the increase of soaking temperature; when temperature is 55℃, the total porosity of coal samples is 57%, which is increased by 46% compared with the total porosity of raw coal sample; the longitudinal wave velocity, peak intensity and elastic modulus of coal samples decline with the increase of soaking temperature, the longitudinal wave velocity, peak intensity and elastic modulus are 571 m/s, 6.73 MPa, 356 MPa, respectively, compared with the raw coal sample were reduced by 416 m/s, 5.12 MPa, 1129 MPa;(2) The combination of SDS aqueous solution and load that intensification the total damage degree of coal samples,showing a distinct non-linear characteristic,the damage of coal samples is microscopic manifestation of the change process of mineral composition and structure, and the macroscopic manifestation is the decrease of the mechanical strength of coal samples and the weakening of resistance to damage.(3) Using the results of new immersion experimental to verify the damage evolution model,the experimental results are in good agreement with the damage evolution model,correlation coefficient is 0.9999. It can be seen that the damage evolution model has good reliability.
引文
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[20] 唐欣薇,周元德.基于改进Weibull分布模型的岩石单轴压缩变形破裂规律研究[J].岩石力学与工程学报,2014,33(S1):2802-2807 (TANG Xinwei,ZHOU Yuande.Study of rock uniaxial compeission deformation and failure character based on an improved Weibull distribution model[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(S1):2802-2807 (in Chinese))
[2] 韩铁林,陈蕴生,师俊平.化学腐蚀后砂岩三轴压缩力学特性及其能量机制的试验研究[J].实验力学,2016,31(5):694-706 (HAN Tielin,CHEN Yunsheng,SHI Junping.Experimental study of mechanical properties and energy mechanism of sandstone subjected to chemical erosion and tri-axial compression[J].Journal of Experimental Mechanics,2016,31(5):694-706 (in Chinese))
[3] 陈四利,冯夏庭,李邵军.化学腐蚀下三峡花岗岩的破裂特征[J].岩土力学,2003,24(5):817-821 (CHEN Sili,FENG Xiating,LI Shaojun.The fracture behaviors of three gorges granite under chemical erosion[J].Rock and Soil Mechanics,2003,24(5):817-821 (in Chinese))
[4] 王伟,刘桃根,吕军,等.水岩化学作用对砂岩力学特性影响的试验研究[J].岩石力学与工程学报,2012,31(S2):3607-3617 (WANG Wei,LIU Taogen,LU Jun,et al.Experimental study of influence of water-rock chemical interaction on mechanical characteristics of sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(S2):3607-3617 (in Chinese))
[5] Ju Yiwen,Luxbacher Kray,Li Xiaoshi.Micro-structural evolution and their effects on physical properties in different types of tectonically deformed coals[J].International Journal of Coal Science &Technology,2014,1(3):364-375.
[6] 苗胜军,蔡美峰,冀东,等.酸性化学溶液作用下花岗岩损伤时效特征与机理[J].煤炭学报,2016,41(5):1137-1144 (MIAO Shengjun,CAI Meifeng,JI Dong,et al.Aging features and mechanism of Granite′s damage under the action of acidic chemical solutions[J].Journal of China Coal Society,2016,41(5):1137-1144 (in Chinese))
[7] 韩铁林,陈蕴生,师俊平,等.水化学腐蚀对砂岩力学特性影响的试验研究[J].岩石力学与工程学报,2013,32(S2):3065-3072 (HAN Tielin,CHEN Yunsheng,SHI Junping,et al.Experimental study of mechanical characteristics of sandstone subjected to hydrochenical erosion[J].Chinese Journal of Rock Mechanics and Engineering,2013,32(S2):3065-3072 (in Chinese))
[8] 丁梧秀,陈建平,徐桃,等.化学溶液侵蚀下灰岩的力学及化学溶解特性研究[J].岩土力学,2015,36(7):1825-1830 (DING Wuxiu,CHEN Jianping,XU Tao,et al.Mechanical and chemical characteristics of limestone during chemical erosion[J].Rock and Soil Mechanics,2015,36(7):1825-1830 (in Chinese))
[9] 丁梧秀,冯夏庭.化学腐蚀下裂隙岩石的损伤效应及断裂准则研究[J].岩土工程学报,2009,31(6):899-904 (DING Wuxiu,FENG Xiating.Damage effect and fracture criterion of rock with multi-preexisting cracks under chemical erosion[J].Chinese Journal of Geotechnical Engineering,2009,31(6):899-904 (in Chinese))
[10] 杜守继,马明,陈浩华,等.花岗岩经历不同高温后纵波波速分析[J].岩石力学与工程学报,2003,22(11):1803-1806 (DU Shouji,MA Ming,CHEN Haohua,et al.Testing study on longitudinal wave chearacteristics of granite after high temperature[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(11):1803-1806 (in Chinese))
[11] Gregg S J,Sing K S W.Adsorption surface area and porosity(2nd ed)[M].London:Academic Press,1982.
[12] 霍多特 B B.宋士钊,王佑安译.煤与瓦斯突出[M].北京:中国工业出版社,1996:27-30 (Hototte B B.SONG Shizhao,WANG Youan,translation.Outburst of coal and gas[M].Beijing:China Industry Press,1996:27-30 (in Chinese))
[13] 夏冬,常宏,卢宏建,等.浸水时间对饱水岩石纵波波速影响的试验研究[J].矿业研究与开发,2016,36(1):68-71 (XIA Dong,CHANG Hong,LU Hongjian,et al.The experiment research for the influence of immersion time on wave volocity of saturated rocks[J].Mining R & D,2016,36(1):68-71 (in Chinese))
[14] 杨永杰,宋扬,陈绍杰,等.煤岩强度离散性及三轴压缩试验研究[J].岩土力学,2006,27(10):1763-1766 (YANG Yongjie,SONG Yang,CHEN Shaojie,et al.Experimental study on strength discreteness and triaxial compression of coal[J].Rock and Soil Mechanics,2006,27(10):1763-1766 (in Chinese))
[15] 刘刚,李明.煤岩单轴与三轴压缩试验研究[J].煤矿安全,2013,44(7):4-6 (LIU Gamg,LI Ming.Experimental study of coal rock uniaxial and triaxial compression[J].Safety in Coal Mines,2013,44(7):4-6 (in Chinese))
[16] 张全胜,杨更社,任建喜,等.岩石损伤变量及本构方程的新探讨[J].岩石力学与工程学报,2003,22(1):30-34 (ZHANG Quansheng,YANG Gengshe,REN Jianxi,et al.New study of damage variable and constitutive equation of rock[J].Chinese Journal of Rock Mechanics and Engineering,2003,22(1):30-34 (in Chinese))
[17] Lemaitre J.How to use damage mechanics[J].Nuclear Engineering and Design,1984,80(1):233-245.
[18] 勒迈特 J 著.陶春虎译.损伤力学教程[M].北京:科学出版社,1996 (Lemaitre J.TAO Chunhu translation.Journal of damage mechanics tutorial[M].Beijing:Science Press,1996 (in Chinese))
[19] 张慧梅,雷利娜,杨更社.基于Weibull统计分布的岩石损伤模型[J].湖南科技大学学报(自然科学版),2014,29(3):29-32 (ZHANG Huimei,LEI Lina,YANG Gengshe.Research on rock statistical damage model and determination of parameters[J].Journal of Hunan University of Science & Technology(Natural Science Edition),2014,29(3):29-32 (in Chinese))
[20] 唐欣薇,周元德.基于改进Weibull分布模型的岩石单轴压缩变形破裂规律研究[J].岩石力学与工程学报,2014,33(S1):2802-2807 (TANG Xinwei,ZHOU Yuande.Study of rock uniaxial compeission deformation and failure character based on an improved Weibull distribution model[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(S1):2802-2807 (in Chinese))
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