微生物胶结建筑渣土结构的数字图像分析  

Digital Image Analysis on Structure of Constructional Waste Soil Cemented by Microorganisms

作　　者：张敏霞[1] 陈晨 牛双建 冯聪睿 徐平[1] 蔡宝帅 ZHANG Minxia;CHEN Chen;NIU Shuangjian;FENG Congrui;XU Ping;CAI Baoshuai(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China;Shenzhen Municipal Engineering Corporation,Shenzhen 518131,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454003 [2]深圳市市政工程总公司,广东深圳518131

出　　处：《工业建筑》2024年第9期43-50,共8页Industrial Construction

基　　金：河南省研究生教育改革与质量提升工程项目(YJS2023KC08);焦作市科技攻关项目(2023210034)。

摘　　要：开展微生物胶结建筑工程渣土颗粒形态的量化研究对分析生物胶结土的改良效果具有直接意义。矩形度、形状指数、棱角性和整体轮廓系数这些形态学指标能直观、定量地表征土结构体,是反映土体稳定性及胶结效果的重要参数。通过对微生物胶结建筑工程渣土进行表观X射线计算机断层扫描,利用数字图像处理技术获取胶结土颗粒的几何形状参数(长度、周长、面积、外接矩形面积、等效椭圆周长),统计计算得出几何形状系数,即形态学指标,从而定量表征微生物胶结土结构体,并分析几何形状系数与级配的相关性。结果表明:微生物胶结建筑工程渣土随其结构体尺度的增大,形状指数和棱角性整体呈增大趋势,矩形度和整体轮廓系数呈下降趋势,结构形状越不规则,几何形状系数与胶结建筑工程渣土颗粒级配有良好的相关性,则是因为微生物诱导生成的碳酸钙在土颗粒表面进行沉淀堆积,增大渣土颗粒尺度,使颗粒表面更为粗糙,进而改变几何形状参数,影响形态学指标。It is of direct significance to carry out quantitative research on the morphology of microbial cemented constructional waste soil for analyzing the effect of soil improvement.The morphological indexes such as rectangularity,shape indexes,angularity and overall contour coefficients could directly and quantitatively characterize the soil structure,which are important parameters to reflect the stability and cured effect of soil.The apparent scan of the microbial cemented soil by CT was conducted,and the geometric shape parameters(the length,perimeter,area,external rectangular area,and equivalent elliptical perimeter)of cemented soil particles were obtained by the digital image processing technique.The geometric shape coefficient,namely morphological index,was calculated statistically,so as to quantitatively characterize the microbial cemented soil structure and analyze the correlation between geometric shape coefficient and gradation.The results showed:with the increase in the scale of the structure,the shape index and the angularity of the microbial cemented constructional waste soil increased as a whole,the rectangularity and the overall contour coefficient decreased,the structure shape was more irregular.The geometric shape coefficient had a good correlation with the particle gradation of cemented construction waste soil.It was because that the calcium carbonate induced by microbial precipitates covered and accumulated on the surface of the soil particles,increasing the particle size of the waste soil and making the particle surface rougher,and then changing the primary characteristic parameters,affecting the morphological indexes.

关 键 词：微生物胶结 建筑工程渣土 微观结构 几何形状参数 数字图像分析 

分 类 号：TU41[建筑科学—岩土工程]