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通过大量的三轴应力作用下岩盐溶蚀特性试验,对岩盐溶蚀特性进行了研究,结果表明,对于岩盐溶解速率来说,三轴应力作用的影响不可忽略;采用宏观溶解速率(即溶蚀质量)与围压、塑性体应变和溶解时间之间的关系来定量描述三轴应力作用下岩盐溶解速率的变化,并在试验的基础上获得了宏观溶解速率与围压、塑性体应变和溶解时间之间的关系表达式;在相同的溶解时间、塑性体应变条件下,不同围压下岩盐试样溶蚀前后的形态差异较明显,应力影响质量变化较大,且随着围压的增加,试样溶蚀后形态的变化越小,应力影响质量越小;揭示了三轴应力作用下岩盐溶蚀特性变化机制,得出三轴应力作用下岩盐溶解速率变化与不同围压下表面裂纹的发育与扩展有着直接的联系。该研究成果为进一步研究岩盐应力-溶解耦合机制奠定了试验依据以及理论基础。
The results show that the effect of triaxial stress can not be neglected for rock salt dissolution rate. By using macroscopic dissolution rate (ie, erosion quality) and Confining pressure, plastic body strain and dissolution time to quantitatively describe the changes of rock salt dissolution rate under triaxial stress. On the basis of experiments, the relationship between macroscopic dissolution rate and confining pressure, plastic strain and dissolution time The results show that the morphological changes of rock salt samples before and after dissolution under different confining pressure are obvious under the same dissolution time and plastic body strain, and the quality of stress changes greatly. With the increase of confining pressure, The smaller the change of the morphology is, the smaller the influence of the stress is. The mechanism of the dissolution of rock salt under triaxial stress is revealed. It is concluded that the dissolution rate of rock salt under triaxial stress is directly related to the development and expansion of surface cracks under different confining pressure Contact. The research results laid the experimental basis and theoretical basis for further research on the stress-dissolution coupling mechanism of rock salt.