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.
作者
钱强
于艳梅
梁卫国
Qian Qiang;Yu Yanmei;Liang Weiguo(College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030000,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2018年第4期968-973,共6页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(51504158)
山西省基础研究项目(2015021128)
关键词
钙芒硝
温度
溶浸
轴压
孔隙率
glauberite
temperature
solution
uniaxial compression
porosity
