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三轴应力作用下岩盐溶解特性试验分析
宋书一1, 姜德义1, 任松1, 杨春和1,2
1.重庆大学 煤矿灾害动力学与控制国家重点实验室,重庆 400044;2.中国科学院武汉岩土力学研究所,武汉 430071
摘要:
岩盐地下储备库是能源储备重要方式。三轴应力作用下岩盐溶解特性的研究,为岩盐地下储库水溶造腔的形状控制、安全建设等提供理论基础。运用三轴岩盐溶解试验机进行了岩盐试样在三轴应力作用下溶解特性试验,研究发现在应力作用下岩盐溶解特性发生显著变化。计算分析了岩盐试样通水孔壁处应力与试样外部载荷轴压和围压的关系,运用等效应力描述通水孔壁处应力分布情况。采用多组围压条件下三轴应力和溶解耦合试验,分析了不同围压条件下岩盐溶解速率与等效应力之间的关系。研究结果表明,岩盐溶解速率随着等效应力的增大先缓慢减小,随之降到最低点,然后又随着等效应力的增加而迅速增大。三轴应力对岩盐溶解速率的影响主要是由于岩盐试样在三轴应力加载过程中造成试样内部裂纹发育及溶蚀面积的变化,在弹性阶段时溶蚀面积减小(裂纹闭合),溶解速率降低,而在塑形阶段时溶蚀面积增大(裂纹发育),溶解速率升高。
关键词:  岩盐  三轴应力  溶解速率  溶蚀面积  裂纹
DOI:10.11835/j.issn.1000-582X.2013.09.003
分类号:
基金项目:国家重点基础研究发展计划(973 计划)项目(2009CB724606);国家自然科学基金资助项目(51074198); 中央高校基本科研业务费资助项目(CDJXS11241182)
Experiment analysis on dissolution characteristics of rock salt on the effect of triaxial stress
SONG Shuyi1, JIANG Deyi1, REN Song1, YANG Chunhe1,2
1.State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;2.Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China
Abstract:
Rock salt underground storage is an important way of energy reserves. The research of rock salt dissolution characteristics under triaxial stress provides theoretical basis for shape control,security building of rock salt underground storage in the process of making aqueous cavity. The dissolution characteristics of rock salt specimens experiment with triaxial testing machine under triaxial stress,through a lot of rock salt dissolution tests,finds that dissolution characteristics of rock salt change remarkably under stress. Analyzing the relationship between the stress of rock salt specimen with the water hole and sample external axial compression or confining pressure,equivalent stress is adopted to describe the stress distribution of the running water hole wall. Triaxial stress and dissolution coupling experiment on the different confining pressure is carried out to analysis the variation between rock salt dissolution rate and equivalent stress under different confining pressures. The results show that rock salt dissolution rate decreases first and then rapid increases with the increase of equivalent stress. The main impact of the stress for rock salt dissolution rate is that cracks development and corrosion area in rock salt specimen are changed because of the triaxial stress loading. Dissolution rate reduces as a result of corrosion area decreasing (crack closure) in the elastic stage,however dissolution rate increases because of corrosion area increasing (crack development) in the plastic stage.
Key words:  rock salt  triaxial stress  dissolution rate  corrosion area  crack
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