摘要
对钙芒硝矿床开采的主要目的是提取其所含的硫酸钠成分,不管采用哪种开采方法,从钙芒硝中提取硫酸钠都会涉及钙芒硝的溶解与渗透。利用高精度μCT225KVFCB显微CT试验系统和MDS-200型三轴渗透试验系统,对在孔隙压出水口敞口状态下的钙芒硝进行了溶解渗透试验的进一步研究。研究表明:在溶解渗透试验过程中,钙芒硝固体骨架由致密不渗透的结构变成了可渗透的多孔介质,其固体骨架一直保持完整;随着溶解渗透时间的不断持续,由于结构的致密程度和矿物成分不断的发生变化,致使其力学性质和有效应力也在不断的发生变化;在轴压、围压不变的情况下,试件溶解贯通所需的时间随着注水压的增大减小,渗透系数随着注水压的增大而增大,随着时间的持续而增大。
The primary target of mining glauberite is the sodium sulfate extracting.It will involve dissolution and permeability of glauberite despite whichever kind of mining method was chosen.The experimental study on the dissolution and permeability of glauberite under exposure outlet is carried out by the high-precision Micro-CT μCT225KVFCB test system and the MDS-200 triaxial permeability test system.In the process of experiment,the nonporous skeleton becomes a porous medium,but its solid skeleton remains intact.Its mechanical character changes constantly because its composition varies during the experiment.When the axial compression and the confining pressure are invariable,with the increase of water injection pressure,the time required for dissolution and transfixion of specimens is reduced,but the permeability increases with water injection pressure and the dissolution duration.
出处
《地下空间与工程学报》
CSCD
北大核心
2013年第1期73-80,共8页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金资助项目(50804033)
全国优秀博士论文专项资金资助项目(200959)
山西农业大学2011年引进人才科研启动项目(XB2011005)
关键词
岩石力学
钙芒硝
溶解渗透
CT
rock mechanics
glauberite
dissolution and permeability
CT
