应力作用下岩盐的溶蚀模型研究  

Study on dissolving model under effect of stress for rock salt

作　　者：汤艳春[1] 周辉[1] 冯夏庭[1] 谢越韬[2] 

机构地区：[1]中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室,武汉430071 [2]河海大学 水利水电工程学院,南京210098

出　　处：《岩土力学》2008年第2期296-302,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金委员会、二滩水电开发有限责任公司雅砻江水电开发联合研究基金项目(No.50579091)

摘　　要：有无应力作用下的岩盐溶蚀机理是一致的,两者之间的差别在于溶蚀作用面积不同。首先通过分析岩盐的溶蚀机理,建立了无应力作用下的岩盐溶蚀模型;通过对有无应力作用下岩盐溶蚀作用差异的分析,提出了等效扩散系数的概念,用于描述应力作用下岩盐的宏观溶蚀速率,从而建立了应力作用下的岩盐溶蚀模型,并提出了根据单轴压缩条件下岩盐应力-溶解耦合效应的细观力学试验结果来计算等效扩散系数的方法,得到了等效扩散系数与扩散系数的比值与轴向塑性应变、溶解时间之间的关系。其研究成果为进一步研究岩盐应力-溶解耦合机理奠定了基础。The dissolving mechanism of rock salt with and without stress is same, but difference between them is the variation of the dissolved surface. Dissolving model of rock salt without stress is set up based on the analysis of dissolving mechanism. By way of analyzing the difference of dissolving mechanism of rock salt with and without stress, equivalent dissolving coefficient is proposed to describe the macro-dissolving speed of rock salt under the stress, based on which dissolving model of rock salt under the stress is set up. The method to calculate the equivalent dissolving coefficient is proposed based on the uniaxial meso-mechanical test data under the coupled mechanical-dissolving effect, and the relationship among axial plastic strain, dissolving time and equivalent dissolving coefficient is obtained. The results can provide an important basis for the further analysis of coupled mechanical-dissolving mechanism of rock salt.

关 键 词：岩盐 溶蚀 应力作用 等效扩散系数 

分 类 号：TU443[建筑科学—岩土工程]