红层软岩基本性质随埋藏深度的演变规律  

Evolution of basic properties of red bed soft rocks with burial depth

作　　者：张骏[1] 黄凯 苏晶文[2] 李云峰[2] 康博 查甫生[1] ZHANG Jun;HUANG Kai;SU Jingwen;LI Yunfeng;KANG Bo;ZHA Fusheng(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Nanjing Center of China Geological Survey,Nanjing 210016,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]中国地质调查局南京地质调查中心,江苏南京210016

出　　处：《合肥工业大学学报（自然科学版）》2022年第11期1558-1562,共5页Journal of Hefei University of Technology：Natural Science

基　　金：皖南红层地区工程地质专题调查资助项目(W2019JSFW0242)。

摘　　要：文章以皖南红层软岩中齐云山组粉砂岩和徽州组泥质粉砂岩为研究对象,对不同埋藏深度下试样的物理性质、矿物组成及微观特征进行试验研究,并通过Image-Pro Plus软件,对不同埋藏深度下2组试样的二维可视孔隙率进行分析。结果表明:随着埋藏深度增加,2组试样的密度逐渐增大,而天然含水率和孔隙率逐渐减小,且2组试样各自的物理性质随埋藏深度增加,在强风化阶段差异明显,在中风化阶段差异减小;随着埋藏深度增加,2组试样中的石英、赤铁矿、石膏占比无明显变化,长石类矿物占比呈明显增加趋势,而黏土类矿物占比呈明显减小趋势。通过扫描电镜(scanning electron microscope,SEM)试验发现,2组试样的微观结构随着埋藏深度增加而逐渐致密,孔隙也随之减少。Taking the Qiyunshan Formation siltstone and Huizhou Formation argillaceous siltstone in the red bed soft rocks of southern Anhui Province as the research object,this paper conducted experimental research on physical properties,mineral composition and microscopic features of samples under different burial depths.The 2D visible porosity of the two groups of samples under different burial depths was analyzed by Image-Pro Plus software.Results showed that with the increase of burial depth,the density of the Qiyunshan Formation siltstone and Huizhou Formation argillaceous siltstone increased gradually,the natural moisture content and porosity decreased gradually,and the physical properties of two groups of samples differed significantly in strong weathering stage and the difference was reduced in the stage of moderate weathering.With the increase of burial depth,the proportions of quartz,hematite and gypsum in the two groups of samples did not change significantly,while the proportions of feldspar minerals showed an obvious increase,those of clay minerals showed a significant decrease.Scanning electron microscope(SEM)test showed that the microstructure of the two groups of samples was gradually densified with the increase of burial depth,and the porosity decreased accordingly.

关 键 词：埋藏深度 红层软岩 物理性质 矿物组成 微观特征 半定量分析 

分 类 号：P584[天文地球—岩石学]