珊瑚砂颗粒分形与孔隙微观结构特征研究  

Study on the particles fractal and pore microstructure characteristicsof coral sand

作　　者：崔翔 姚劲松 CUI Xiang;YAO Jinsong(Changjiang Survey,Planning,Design and Research Co.,Ltd.,Wuhan 430014,China)

机构地区：[1]长江勘测规划设计研究有限责任公司,湖北武汉430014

出　　处：《水利水电快报》2023年第8期80-86,共7页Express Water Resources & Hydropower Information

基　　金：武汉市科技计划项目(2021WHYCQN-06)。

摘　　要：为帮助后续研究建立珊瑚砂与常见介质力学性质及透水性的关系,以便工程中对珊瑚砂地层做出更加准确可靠的工程地质评价,利用PartAn 3D型颗粒形貌扫描及CT扫描手段,从微观角度描述了块状、片状和棒状3种珊瑚砂颗粒的形貌特征及其对珊瑚砂综合孔隙特征的影响。结果表明:利用长宽比、长厚比、宽厚比和偏差度4种参数,可对3种珊瑚砂颗粒进行具体定义;其中,颗粒偏差度和长宽比是决定3种颗粒形成的孔隙特征主导因素,且偏差度和长宽比对孔喉性质、介质连通性和孔隙特征参数离散性的影响不同。在混合珊瑚砂中,块状、片状和棒状颗粒对综合孔隙特征产生不同影响,片状颗粒主要影响孔隙性质和介质整体连通性,棒状颗粒主要影响喉道性质,3种颗粒共同决定了连通孔隙的分布情况。In order to establish the relationship between mechanical properties and permeability of coralline sand and common media,and to be conducive to making engineering geological evaluation of coralline sand strata more accurate and reliable,using PartAn 3D particle morphology scanning and CT scanning,the morphology characteristics of three kinds of coral sand particles,namely,block,flake and bar particles,and their effects on the comprehensive pore characteristics of coral sand were described from microscopic point of view.The results showed that the three kinds of coral sand particles could be described by using L/W,L/T,W/T and deviation degree.Among them,the grain deviation degree and the L/W were the dominant factors that determined the pore properties of three types of particles,and the deviation degree and L/W had different effects on the properties of pore throat,medium connectivity and porosity dispersion.In mixed coral sand,block,flake and bar particles affected the comprehensive pore properties from different aspects.The flake particles mainly affected the pore properties and the overall connectivity of the medium,while the bar particles mainly affected the throat properties,and the three particles could jointly determined the distribution of connectivity in the medium.

关 键 词：珊瑚砂 钙质砂 微观结构 颗粒种类 颗粒形貌 孔隙性质 

分 类 号：TU43[建筑科学—岩土工程]