doi:10.16186/j.cnki.1673-9787.2023030064

Received:2023-03-27

Revised:2023-04-21

Online Date: 2023-07-10

Characterization of 3D pore and fissure structure parameters of pressurized grouted bodybased on CT scan（Online）

ZHU Changxing1,2, WU Dazhi1, WANG Fenge2, SUN Jiaxin1

1.School of Civil Engineering，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.School of Compute Science and Technology，Henan Polytechnic University，Jiaozuo  454000，Henan，China

Abstract:In order to study the structural evolution characteristics of pore and fissure during the uniaxial compression of the grading gravel specimen， industrial CT scanning was performed in stages during the uniaxial compression of the specimen，and AVIZO was used to analyze the CT slices，reconstruct the 3D model of pore and fissure structure，and quantitatively characterize the characteristic parameters of pore and fissure and pore throat.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，and the pore and fissure evolution characteristics are relatively obvious，the increase of pore number in the emergence stage is 14.41% without obvious penetration； the increase of pore number in the development stage is 326.91%，accompanied by a certain number of pore penetration； the increase of pore number in the expansion stage is -50.79%，the increase of pore equivalent diameter maximum is 223.45%，and most of the pore and fissure characteristics are quantitative.223.45%，most of the pore penetration is fracture； the number of pore fracture in the penetration stage is almost unchanged，the maximum increase of pore equivalent diameter is 92.83%，multiple fracture surfaces are formed after fracture penetration.After the peak，there are connected pores in the test block，and the pores and throats of the grouted body are completely developed at this stage， and the test block is destroyed.The results of the pore structure evolution characteristics of the microscopic destruction process of the injected body specimen block provide reference for the subsequent practice of fractured rock grouting engineering.

Key words:CT scan;grouted body;3D reconstruction;pore fissure structure;pore throat model

CLC：TU472