滇中白云岩砂化机理初探  

Study on the Sanding Mechanism of Dolomite in Central Yunnan

作　　者：吴永红[1] 徐洪钟 何骁 王沐婉 王世华 赵永川 米健 WU Yonghong;XU Hongzhong;HE Xiao;WANG Muwan;WANG Shihua;ZHAO Yongchuan;MI Jian(Faculty of Construction Engineering,Kunming University of Science and Technology,Kunming 650500,China;College of Transportation Engineering,Nanjing Tech University,Nanjing 211816,China;Yunnan Dianzhong Water Diversion Engineering Co.Ltd.,Kunming 650500,China;Yunnan Institute of Water and Hydropower Engineering Investigation,Design and Research,Kunming 650021,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500 [2]南京工业大学交通运输工程学院,南京211816 [3]云南省滇中引水工程有限公司,昆明650500 [4]云南省水利水电勘测设计研究院,昆明650021

出　　处：《高校地质学报》2025年第2期229-237,共9页Geological Journal of China Universities

基　　金：云南省重大科技专项计划项目(202002AF080003)资助。

摘　　要：为了对比构造作用和溶蚀作用对滇中引水工程玉溪段白云岩砂化的影响,开展了不同酸性溶液、温度条件下的白云岩室内静态溶蚀试验,采用SEM、XRD及EDS能谱分析进一步探究滇中引水工程玉溪段白云岩的砂化机理。溶蚀试验结果表明,白云岩自身晶体结构和温度是影响白云岩溶蚀速率的主要因素;溶蚀后岩样微观结构与砂化程度更高、未溶蚀的岩样微观结构存在明显差异。PCAS软件的微观结构定量分析可知,岩样距断层越近,岩样破碎越严重,概率熵、分形维数、表观孔隙率越高。XRD及EDS能谱的结果表明,不同砂化程度的白云岩岩样矿物成分变化不明显。对于研究区域砂化白云岩地层,溶蚀作用不是砂化的主要因素,构造破裂作用才是白云岩砂化的主控因素。In order to investigate the effects of structural rupture and dissolution on dolomite sanding in Yuxi section of central Yunnan water diversion project,indoor static dissolution experiments of dolomite under different acid solutions and temperatures were carried out.Further study on the sanding mechanism of dolomite in Yuxi section of central Yunnan water diversion project was conducted by means of SEM,XRD and EDS energy spectrum analysis.The dissolution test results show that crystal structure and temperature of dolomite are the main factors affecting dissolution rates of dolomite,and microstructures of rock samples after dissolution becomes obviously different from that of rock samples with higher degree of sanding and being undissolved.The quantitative analysis of the microstructure of PCAS software reveals that the closer the rock sample is to the fault,the more seriously broken the rock sample becomes,and the higher the probability entropy,the higher fractal dimension and apparent porosity. The results of XRD and EDS spectra show that the mineral composition of dolomite samples with different degrees of sanding does not change obviously. For the study of regional sandy dolomite strata, dissolution is not the main factor of sanding, but tectonic fracture is the main controlling factor of dolomite sanding.

关 键 词：白云岩 砂化 构造破碎 溶蚀 微观结构 

分 类 号：U43[交通运输工程—道路与铁道工程]