Determination of shear failure regions of rock joints based on point clouds and image segmentation

Ge, Yunfeng; Xie, Zhiguo; Tang, Huiming; Chen, Hongzhi; Lin, Zishan; Du, Bin

doi:10.1016/j.enggeo.2019.105250

Cited by 19 publications

(6 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specimen blocks were sourced from travertine and granite mines located in an industrial region in the south of Tehran, Iran. The selection of these rocks was made with a view to having a variety of textures as travertine, being a sedimentary rock, features a porous and streaky formation, whereas igneous granite has a homogeneous structure; and it is known that the rock type material has a determinative role in the creation of rock joints [ 33 , 36 ]. Based on the roughness of the acquired produced tensile fractured joints, four distinct joint types with different joint roughness values (JRC) were selected to be cast with high precision silicon rubbers.…”

Section: Experimental Programmentioning

confidence: 99%

Investigating the Effects of Cement and Polymer Grouting on the Shear Behavior of Rock Joints

et al. 2022

View full text Add to dashboard Cite

This study carried out a comparison between cement grouting and chemical grouting, using epoxy and polyurethane, with respect to their effects on the shear behavior of joints. Joint replicas, with three different grades of surface roughness, were molded and grouted by means of cement and epoxy grouts of various mixtures. To investigate their shear behavior, samples were subjected to direct shear tests under constant normal load (CNL) condition. According to the results obtained, grouting improves the overall shear strength of the rock joints. All the grouted samples yielded higher maximum and residual shear strength in comparison with the non-grouted joint. Grouting resulted in an improvement in the cohesion of all the samples. However, a fall in friction angle by 5.26° in the sample with JRC of nine was observed, yet it was reduced by 2.36° and 3.26° for joints with JRC of 14 and 19, respectively. Cement grouts were found to have a more brittle behavior, whereas the chemical grouts were more ductile. Higher amounts of cement used in the grout mixture do not provide as much cohesion and only increase the brittleness of the grout. As a result of being more brittle, cement grout breaks into small pieces and joint planes are in better contact during shearing; consequently, there would be less of a fall in friction angle as opposed to epoxy grout whose ductile characteristic prevents grout chipping; therefore, joint planes are not in contact and a greater fall in the friction angle occurs. There was no noticeable change in the cohesion of the larger grouted joints. However, the friction angle of both natural and grouted joints increased in the larger joint. This can be related to the distribution of random peaks and valleys on the joint surface, which increases with the joint size.

show abstract

Section: Experimental Programmentioning

confidence: 99%

Investigating the Effects of Cement and Polymer Grouting on the Shear Behavior of Rock Joints

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The influences of irregular rock mass structures on the mechanical and failure characteristics are ignored, which makes the mechanical characteristics of rock mass differ from the test results. With the development of measurement technology, several studies have applied digital photogrammetry methods to rock mass structure measurements [115][116][117][118][119]. In particular, 3D laser scanners can achieve real replication and are now gradually being used in the field of engineering measurements and detection.…”

Section: Integration Of 3dp With 3d Scanning and Ct Scanningmentioning

confidence: 99%

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

et al. 2021

View full text Add to dashboard Cite

In the engineering of underground construction, the discontinuous structures in rock mass have important influences on the mechanical behaviors of the subsurface of rock mass. The acquisition of mechanical parameters is the basis of rock mass engineering design, construction, safety, and stability evaluation. However, the mechanical parameters and failure characteristics of the same rock mass under different mechanical conditions cannot be obtained due to the limitations of specimen preparation techniques. In recent years, with the continuous development of 3D printing (3DP) technology, it has been successfully applied to the repetitive preparation of rock mass samples. The combinations of 3DP and other techniques, such as 3D scanning and CT scanning, provided a new approach to study the mechanical behavior of complex structural rock masses. In this study, through a comprehensive review of the technical progress, equipment situation, application fields, and challenges of the use of 3DP technology, the following conclusions were obtained: (1) 3DP technology has advantages over traditional rock mass specimen preparation techniques, and the verification of test results using 3D printed samples shows that the 3DP has broad application prospects in geotechnical engineering. (2) The combination of 3DP and other advanced techniques can be used to achieve the accurate reconstruction of complex structural rock masses and to obtain the mechanical and failure characteristics of the same rock mass structure under different mechanical boundary conditions. (3) The development of 3DP materials with high strength, high brittleness, and low ductility has become the major bottleneck in the application of 3DP in geotechnical engineering. (4) 3D printers need to meet the high precision and large size requirements while also having high strength and long-term printing ability. The development of 3D printers that can print different types of materials is also an important aspect of the application of 3DP in geotechnical engineering.

show abstract

“…Sun et al (2019) used a clustering superpixel segmentation algorithm combining color, spatial location, and texture to identify and separate waste rock and raw coal. Ge et al (2019) determined the shear failure area of rock joints based on point cloud and image segmentation. Li and Zhang (2019) proposed a fracture segmentation method based on contour evolution and gradient direction consistency to accurately segment the fracture network in coal and rock CT image sequences.…”

Section: Introductionmentioning

confidence: 99%

Automatic batch recognition of rock deformation areas based on image segmentation methods

Yuan

Nie

et al. 2023

Front. Earth Sci.

View full text Add to dashboard Cite

Image recording and analysis is an important but time-consuming method for understanding the rock mechanics mechanism. In this paper, a method for automatic batch identification of rock deformation areas is proposed. We crop the original image to remove irrelevant background. And we use adaptive threshold segmentation, region growth segmentation and global threshold segmentation and combine the characteristics of the image to identify the rock deformation area. Finally, we use image morphology processing to make the recognition result more accurate. For validation, 359 images of the rock samples of the uniaxial compression test were quickly identified. The identification time was approximately 5′56.83′. The average relative error of the method in the X and Y directions is 10.88% and 8.60%, respectively. In addition, using the identification results and the stress-strain curve, it was found that the water content and initial crack length of rock increase, and the compressive strength decreases; the effect of the initial fracture inclination on the compressive strength of the rock is not obvious.

show abstract

Determination of shear failure regions of rock joints based on point clouds and image segmentation

Cited by 19 publications

References 41 publications

Investigating the Effects of Cement and Polymer Grouting on the Shear Behavior of Rock Joints

Investigating the Effects of Cement and Polymer Grouting on the Shear Behavior of Rock Joints

Application of 3D Printing Technology in the Mechanical Testing of Complex Structural Rock Masses

Automatic batch recognition of rock deformation areas based on image segmentation methods

Contact Info

Product

Resources

About