裂隙岩石试件超细水泥注浆效果CT分析

发布时间：2018-02-22 20:11

本文关键词： 注浆实验 CT扫描多阈值分割分形维数　出处：《采矿与安全工程学报》2017年05期 　论文类型：期刊论文

【摘要】：为了研究围岩注浆加固后浆液结石体对围岩裂隙的填充效果,采用超细硅酸盐水泥和泥岩试件进行注浆试验,借助于CT(Computed Tomography)扫描技术,对试件的CT数字图像进行多阈值分割的处理,通过盒维数法计算图像的分形维数,对注浆后试件的内部细观变化进行研究。研究表明:超细水泥浆液注入岩石试件后,裂纹出现劈裂延伸的现象;注浆前截面上裂纹比例平均值为3%,注浆后浆液结石体在裂隙中填充率为63%~88%;宽裂纹中水泥浆液填充率较低,而细小裂纹中浆液结石体填充率较高;截面分形维数从注浆前1.27~1.42下降至注浆后的1.01~1.21。
[Abstract]:In order to study the filling effect of grouting stone on the crack of surrounding rock, the grouting test was carried out by using ultrafine Portland cement and mudstone specimen, and the scanning technique of CT(Computed Tomographywas used. The CT digital image of the specimen is processed by multi-threshold segmentation, the fractal dimension of the image is calculated by box dimension method, and the microscopic changes of the specimen after grouting are studied. The results show that the ultrafine cement slurry is injected into the rock specimen. The average ratio of cracks on the section before grouting is 3, and the filling rate of slurry stone body after grouting is 63 ~ 888.The filling rate of cement slurry in wide crack is lower than that in small crack, and the filling rate of slurry stone in small crack is higher. The fractal dimension of cross section decreased from 1.27 ~ 1.42 before grouting to 1.01 ~ 1.21 after grouting.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院深部岩土力学与地下工程国家重点实验室;
【基金】：国家自然基金项目(51274204) 教育部新世纪人才支持计划项目(NCET-12-0956) 中央高校基本科研业务费专项资金项目(2009QL04)
【分类号】：TD353

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