Q_(2)黄土微观结构特征三维数字化方法实现  

Realization of 3D Digitization Method for Q_(2) Loess MicrostructureCharacteristics

作　　者：洪秋阳 来弘鹏[2] 刘禹阳 Hong Qiuyang;Lai Hongpeng;Liu Yuyang(College of Civil Engineering,Anhui Jianzhu University,Hefei 230601,P.R.China;School of Highway,Changan University,Xian 710064,P.R.China;National-Local Joint Engineering Laboratory of Building Health Monitoring and Disaster Prevention Technology,Anhui Jianzhu University,Hefei 230601,P.R.China;School of Civil Engineering,Changan University,Xian 710064,P.R.China)

机构地区：[1]安徽建筑大学土木学院,合肥230601 [2]长安大学公路学院,西安710064 [3]安徽建筑大学建筑健康监测与灾害预防技术国家地方联合工程实验室,合肥230601 [4]长安大学建筑工程学院,西安710064

出　　处：《地下空间与工程学报》2024年第6期1806-1817,1866,共13页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(52308386,52278391);安徽省高校自然科学重点项目(2023AH050186);安徽建筑大学引进人才科研项目(2022QDZ24);建筑健康监测与灾害预防国家地方联合工程实验室开放基金(GG23KF005)。

摘　　要：土体微观结构的定量化分析是土力学中非常重要的内容,目前的分析方法仍存在计算精度低、可视化效果差、分析内容局限等缺点。鉴于此,本文基于数字图像处理技术,提出一种基于SEM图像三维可视化建模和数字化分析方法,通过在Grasshopper平台的二次开发,实现了土体微观结构的数字化定量处理,给出了土颗粒表面粗糙度、表面凹凸度、三维孔隙比、孔隙三维分形维数等微观参数的计算方法。基于上述方法对Q_(2)黄土微观结构特征进行了定性和定量分析,结果表明:Q_(2)黄土以凝块和絮凝状结构为主,土颗粒间相对紧凑且牢固;土颗粒表面粗糙度主要分布于0~30之间,凹凸度主要分布在-40~40之间;三维孔隙比在0.60~0.72之间,三维孔隙分形维数在2.52~2.63之间。The quantitative analysis of soil microstructure is a quite significant content in soil mechanics.The current analytical methods still suffer from several shortcoming,inducing low computational accuracy,poor visualization effects,and limited analysis content.In view of this,based on digital image processing technology,this paper proposes a 3D visual modeling and digital analysis method based on SEM images.Through secondary development on the Grasshopper platform,the digital quantitative processing of soil microstructure is realized.The calculation methods of soil particle surface roughness,surface concavity and convexity,3D void ratio,3D pore fractal dimension,and other micro parameters are given.Based on the above methods,the qualitative and quantitative analysis of the microstructure characteristics of Q_(2) loess are carried out.The results show that:Q_(2) loess is mainly of agglomerate and flocculent structure,and the soil particles are relatively compact and firm.The surface roughness of soil particles is mainly distributed between 0~30,and the concavity and convexity are mainly distributed between-40~40.The 3D porosity ratio is 0.60~0.72,and the 3D pore fractal dimension is 2.52~2.63.

关 键 词：Q_(2)黄土 数字化分析 电镜扫描 土力学 微观结构特征 

分 类 号：TU411[建筑科学—岩土工程]