摘要
电镜扫描(SEM)常应用于岩土工程研究,通过对岩石样的细观扫描、微观成像可得到岩石表面形貌的放大图片,来研究岩石的渗透系数。将电镜扫描用于观察矿石的微观结构特征,可以评估矿石的渗透性,为矿山开采和矿井排水等工作提供依据。本文通过对在甘肃早子沟金矿采集的矿井岩石的孔隙裂隙进行电镜扫描实验,获得了该矿井岩石的细观图像;运用MATLAB软件进行编程,对电镜扫描图像进行二值化处理得到最佳阈值Tb;利用Image-Pro-Plus软件对进行二值化处理后的图像孔隙参数进行提取;最后利用COMSOL Multiphysics软件进行数值模拟以观察矿井岩石的渗流通道和连通性。研究结果表明,对早子沟金矿矿井岩石的SEM图像的解析,可与理论计算结果相互印证,从该矿床矿井中采集的不同岩石类型普遍显示出较低的孔隙率和渗透率特性。在孔隙率相近的不同岩石样本中,分形维数可以作为一个有效的指标来区分孔隙结构复杂性。由COMSOL Multiphysics软件对岩石的微观孔隙渗流情况进行数值模拟可知,该金矿岩石样本的连通度较差,因此该区域地层富水性较差。
Scanning electron microscopy(SEM)is commonly applied in geotechnical engineering research.By scanning and imaging the microstructures of rock samples,it is possible to obtain magnified images of the rock surface topography,which can be used to study the permeability of rocks.The utilization of SEM to observe the microstructural characteristics of ores can assess their permeability,which will provide a basis for mining operations and mine drainage work.This work conducted SEM experiments on the pores and fractures of rocks from the Zaozigou gold deposit in Gansu Province,and obtained microscopic images of the mine rocks.The MATLAB software was utilized for programming to perform binary processing on electron microscopy scanning images,and the optimal threshold Tb was obtained.Numerical simulation was also conducted by using the COMSOL Multiphysics software,in order to observe the seepage pathways and connectivity of mine rocks.Results indicate that the analysis of SEM images for mine rocks from the Zaozigou gold deposit corresponds well with the theoretical calculations.Different rock types from this deposit generally exhibit low porosity and permeability.For different rock samples with similar porosity,fractal dimension can be used as an effective indicator to distinguish their pore structure complexity.The numerical simulation of micro pore permeability using the COMSOL Multiphysics software shows poor connectivity of rock samples,resulting in poor water yield in the regional strata.
作者
叶美娜
仲海书
张震
李保珠
田向盛
张英
YE Meina;ZHONG Haishu;ZHANG Zhen;LI Baozhu;TIAN Xiangsheng;ZHANG Ying(School of Land and Resource Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650000;Key Laboratory of Geohazard Forecast and Geoecological Restoration in Plateau Mountainous Area,Ministry of Natural Resources of the People's Republic of China,Kunming,Yunnan 650000;The Third Geological and Mineral Exploration Institute of Gansu Provincial Bureau of Geology and Mineral Resources,Lanzhou,Gansu 730000)
出处
《地质与勘探》
CAS
CSCD
北大核心
2024年第6期1142-1152,共11页
Geology and Exploration
