溶浸-应力条件下钙芒硝孔隙率变化规律研究
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摘要
采用原位溶浸法开采钙芒硝矿,会使钙芒硝内部物理结构改变,随之会引起其力学性能及渗透性的改变,从而影响原位溶浸开釆效率。利用μCT225k VFC型显微CT试验系统,得到不同溶浸温度、单轴压缩条件下钙芒硝内部结构CT图像,通过孔隙率值的变化归纳出钙芒硝变形和溶蚀规律。研究表明:钙芒硝在35℃水中溶浸10 h后发生膨胀,在1 MPa轴向载荷下,处于孔裂隙压密向弹性变形过渡阶段;钙芒硝在浸泡后孔裂隙增长明显,施加1 MPa轴向载荷后,孔裂隙增长不明显;溶浸温度为65℃时,钙芒硝孔隙率增长值最大;95℃时,孔隙率增长率最大,孔隙变化最明显。研究结果对钙芒硝矿床开采利用具有重要参考价值。
During the process of glauberite salt rock in-situ solution mining,the internal structure of glauberite salt rock changes,causing further changes of mechanical property and permeability. The internal structure images of the glauberite under different temperature and uniaxial compression conditions were obtained by using theμCT225 k VFC type micro-CT experimental system. The deformation and internal pore-fracture variation rules were summarized based on the porosity values affected by the dissolution and stress effects. The results are as follow:leaching inflation happens after the specimens are soaked in 35 ℃ aqueous solution for ten hours. The glauberite sample is in the transition stage between initial compression phase and elastic deformation stage under 1 MPa axial load. Hole crack growth is obvious after the specimens being soaked in water solution. However,when it was added with 1 MPa axial load,the change of porosity is not obvious. The porosity growth goes highest at 65 ℃ leaching temperature,and when it grows to 95 ℃,the porosity growth rate becomes largest and the pore change is most obvious. The results are of important value to glauberite solution mining.
During the process of glauberite salt rock in-situ solution mining,the internal structure of glauberite salt rock changes,causing further changes of mechanical property and permeability. The internal structure images of the glauberite under different temperature and uniaxial compression conditions were obtained by using theμCT225 k VFC type micro-CT experimental system. The deformation and internal pore-fracture variation rules were summarized based on the porosity values affected by the dissolution and stress effects. The results are as follow:leaching inflation happens after the specimens are soaked in 35 ℃ aqueous solution for ten hours. The glauberite sample is in the transition stage between initial compression phase and elastic deformation stage under 1 MPa axial load. Hole crack growth is obvious after the specimens being soaked in water solution. However,when it was added with 1 MPa axial load,the change of porosity is not obvious. The porosity growth goes highest at 65 ℃ leaching temperature,and when it grows to 95 ℃,the porosity growth rate becomes largest and the pore change is most obvious. The results are of important value to glauberite solution mining.
引文
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[12]徐素国,梁卫国,赵阳升.钙芒硝盐岩物理力学特性研究[J].地下空间与工程学报,2007,3(6):1054-1059.(Xu Suguo,Liang Weiguo,Zhao Yangsheng.Study on physico-mechanical property of glauberite salt rock[J].Chinese Journal of Underground Space and Engineering,2007,3(6):1054-1059.(in Chinese))
[13]吴池,刘建锋,周志威,等.岩盐三轴蠕变声发射特征研究[J].岩土工程学报,2016,38(增2):328-323.(Wu Chi,Liu Jianfeng,Zhou Zhiwei,et al.Creep acoustic emission of rock salt under triaxial compression[J].Chinese Journal of Geotechnical Engineering,2016,38(Supp.2):328-323.(in Chinese))
[2]梁卫国,赵阳升,徐素国,等.原位溶浸采矿理论研究[J].太原理工大学学报,2012,43(3):382-387.(Liang Weiguo,Zhao Yangsheng,Xu Suguo,et al.Theoretical study of in-situ solution mining[J].Journal of Taiyuan University of Technology,2012,43(3):382-387.(in Chinese))
[3]郤保平,赵阳升.层状盐岩溶腔储气库长期运行稳定性研究[J].地下空间与工程学报,2007,3(增2):1562-1567.(Xi Baoping,Zhao Yangsheng.Investigation on stability of gas storage caverns in bedded rock salt[J].Chinese Journal of Underground Space and Engineering,2007,3(supp.2):1562-1567.(in Chinese))
[4]梁卫国,徐素国,赵阳升.钙芒硝盐岩溶解渗透力学特性研究[J].岩石力学与工程学报,2006,25(5):951-955.(Liang Weiguo,Xu Suguo,Zhao Yangsheng.Investigation on solution pervasion and mechanical characteristics of glauberite salt rock[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(5):951-955.(in Chinese))
[5]杨晓琴,梁卫国,于艳梅,等.溶浸作用下难溶盐岩力学特性弱化及细观机制研究[J].岩石力学与工程学报,2014,33(1):134-143.(Yang Xiaoqin,Liang Weiguo,Yu Yanmei,et al.Mechanical property weaking and meso-mechanism of hard dissolved salt rock soaked in brine[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(1):134-143.(in Chinese))
[6]高红波,梁卫国,杨晓琴,等.高温盐溶液浸泡作用下石膏岩力学特性试验研究[J].岩石力学与工程学报,2011,30(5):935-943.(Gao Hongbo,Liang Weiguo,Yang Xiaoqin,et al.Experimental study of mechanical of gypsum rock soaked in hot saturated brine[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(5):935-943.(in Chinese))
[7]徐军,梁卫国,张继龙,等.不同离子浓度钙液环境中钙芒硝溶解试验研究[J].地下空间与工程学报,2013,9(3):503-509.(Xu Jun,Liang Weiguo,Zhang Jilong,et al.Experimental research on glauberite dissolution in calcium liquid with different ion concentration[J].Chinese Journal of Underground Space and Engineering,2013,9(3):503-509.(in Chinese))
[8]刘慧,杨更社,叶万军,等.基于CT图像的冻结岩石冰含量及损伤特性分析[J].地下空间与工程学报,2016,12(4):912-919.(Liu Hui,Yang Gengshe,Ye Wanjun,et al.Analysis of ice content and damage characteristics of frozen rock based on pseudo-color enhanced CT image[J].Chinese Journal of Underground Space and Engineering,2016,12(4):912-919.(in Chinese))
[9]汤艳春,周辉冯,夏庭.单轴压缩条件下岩盐应力–溶解耦合效应的细观力学试验分析[J].岩石力学与工程学报,2008,27(2):294-302.(Tang Yanchun,Zhou Hui,Feng Xiating.Analysis of mesomechanical test of rock salt considering coupled stressed-dissolving effects under uniaxial compression[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(2):294-302.(in Chinese))
[10]高红波,徐素国,韩传磊,等.钙芒硝盐岩溶解机理细观研究[J].地下空间与工程学报,2012,8(4):722-725.(Gao Hongbo,Xu Suguo,Han Chuanlei,et al.Study of meso-dissolution mechanism of glauberite[J].Chinese Journal of Underground Space and Engineering,2012,8(4):722-725.(in Chinese))
[11]刘中华,薛晋霞,胡耀青,等.钙芒硝溶解渗透试验研究[J].地下空间与工程学报,2013,9(1):73-80.(Liu Zhonghua,Xue Jinxia,Hu Yaoqing,et al.Experimental study on the dissolution and permeability of glauberite[J].Chinese Journal of Underground Space and Engineering,2013,9(1):73-80.(in Chinese))
[12]徐素国,梁卫国,赵阳升.钙芒硝盐岩物理力学特性研究[J].地下空间与工程学报,2007,3(6):1054-1059.(Xu Suguo,Liang Weiguo,Zhao Yangsheng.Study on physico-mechanical property of glauberite salt rock[J].Chinese Journal of Underground Space and Engineering,2007,3(6):1054-1059.(in Chinese))
[13]吴池,刘建锋,周志威,等.岩盐三轴蠕变声发射特征研究[J].岩土工程学报,2016,38(增2):328-323.(Wu Chi,Liu Jianfeng,Zhou Zhiwei,et al.Creep acoustic emission of rock salt under triaxial compression[J].Chinese Journal of Geotechnical Engineering,2016,38(Supp.2):328-323.(in Chinese))