基于CT扫描受压注浆体试块三维孔裂隙结构参数表征  

Characterization of 3D pore and fissure structure parameters of pressurized grouted body based on CT scan

作　　者：朱昌星[1] 吴大志 王凤娥[2] 孙家鑫 ZHU Changxing;WU Dazhi;WANG Feng’e;SUN Jiaxin(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China;School of Computer Science and Technology,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000 [2]河南理工大学计算机科学与技术学院,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2024年第3期42-49,共8页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(51874119);河南省教育厅科研项目(2011A440003);河南理工大学博士基金资助项目(B2009-96)。

摘　　要：目的为研究注浆体试块单轴压缩过程中孔裂隙结构演化特征,方法以级配砂砾注浆体试块为研究对象,对其单轴压缩过程分阶段进行工业CT扫描,并采用AVIZO对CT切片进行分析,重构孔裂隙结构三维模型,定量表征孔裂隙与孔喉特征参数。结果结果表明:单轴压缩下,试块依次经历孔裂隙萌生、发育、扩展与贯通阶段,孔裂隙演化特征比较明显,萌生阶段孔隙数增幅为14.41%,无明显贯通;发育阶段孔隙数增加326.91%,伴有一定数目孔隙贯通;扩展阶段孔隙数减少了57.79%,孔隙等效直径最大值增幅为223.45%,大部分孔隙贯通为裂隙;贯通阶段孔裂隙数目几乎不变,孔隙等效直径最大值增幅为92.83%,裂隙贯通后形成多个破裂面。峰值后试块出现连通孔隙,该阶段注浆体孔隙与喉道发育完全,试块破坏。结论研究结果可为后续破碎岩石注浆工程实践提供参考。Objectives In order to study the structural evolution characteristics of pores and fissures during the uniaxial compression of graded gravel specimens,Methods industrial CT scanning was performed in stages during the compression process.AVIZO was used to analyze the CT slices,reconstruct the 3D model of pore and fissure structure,and quantitatively characterize the characteristic parameters of pores,fissures and pore throats.Results The results show that the test blocks,under uniaxial compression,go through the stages of pore and fissure emergence,development,expansion,and penetration in turn.The characteristics of pore and fissure evolution are relatively obvious.The increase in pore number during the emergence stage is 14.41%without obvious penetration;the increase in pore number during the development stage is 326.91%,accompanied by a certain number of pore penetration;the decrease in pore number during the expansion stage is-57.79%.The maximum increase in pore equivalent diameter is 223.45%,and most of the pore and fissure characteristics are quantitative.Most of the pore penetration results in fractures;the number of pore fractures in the penetration stage is almost unchanged,with the maximum increase in pore equivalent diameter being 92.83%.Multiple fracture surfaces are formed after fracture penetration.After reaching the peak,connected pores appear in the test block,indicating complete development of pores and throats in the grouted body,ultimately leading to the destruction of the test block.Conclusions The results of the pore structure evolution characteristics during the microscopic destruction process of the injected body specimen block provide reference for the subsequent practice of fractured rock grouting engineering.

关 键 词：CT扫描 注浆体 三维重构 孔裂隙结构 孔喉模型 

分 类 号：TU528.58[建筑科学—建筑技术科学]