scholarly journals Determination of Joint Surface Roughness Based on 3D Statistical Morphology Characteristic

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hang Lin ◽  
Jianxin Qin ◽  
Yixian Wang ◽  
Yifan Chen
Keyword(s):  
Shear Strength ◽  
Laser Scanning ◽  
Statistical Parameter ◽  
Experimental Results ◽  
Rock Joints ◽  
Joint Surface ◽  
3D Laser Scanning ◽  
Measuring Point ◽  
Scanning Technique ◽  
Jrc Value

Roughness significantly affects the shear behavior of rock joints, which are widely encountered in geotechnical engineering. Since the existing calculation methods on the joint roughness coefficient (JRC) fail to obtain a sufficiently accurate value of JRC, a new determination method was proposed in this study, where the 3D laser scanning technique and self-compiled Python code, as well as the statistical parameter methods, were applied. Then, the shear strength of jointed rock was evaluated via Barton's model, and therefore, a comprehensive comparison between the calculating results and experimental results was executed. Ultimately, the influencing factors of roughness profile extraction on the accuracy of JRC value, such as the measuring point interval, profile number, and measuring direction, were investigated. The results show that (1) equipped with the 3D laser scanning technique, the roughness profiles can be accurately extracted via the self-compiled Python code, (2) an excellent consistency of shear strength could be observed between the calculating value and experimental results, verifying the validity and accuracy of the proposed method, and (3) a smaller measuring point interval can produce a more accurate digital profile and more accurate JRC value. To a certain extent, the more the sample numbers of profiles, the smaller the value of JRC.

Calibration of Rock Joint Roughness and Shear Strength with the Use of 3D Laser Scanning Technique

2011 ◽  
Vol 18 (3) ◽  
pp. 27-34 ◽  
Author(s):  
C C Y Tam ◽  
A K L Kwong ◽  
P K K Lee
Keyword(s):  
Shear Strength ◽  
Laser Scanning ◽  
Rock Joint ◽  
3D Laser Scanning ◽  
Joint Roughness ◽  
Scanning Technique

Determination of the shear failure areas of rock joints using a laser scanning technique and artificial intelligence algorithms

2021 ◽  
pp. 106320
Author(s):  
Yunfeng Ge ◽  
Zhiguo Xie ◽  
Huiming Tang ◽  
Bin Du ◽  
Bei Cao
Keyword(s):  
Artificial Intelligence ◽  
Laser Scanning ◽  
Shear Failure ◽  
Rock Joints ◽  
Scanning Technique

scholarly journals Shear Strength of Flat Joint considering Influencing Area of Bolts

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Hang Lin ◽  
Penghui Sun ◽  
Yifan Chen
Keyword(s):  
Shear Strength ◽  
Jointed Rock ◽  
Calculation Model ◽  
Bolted Joints ◽  
Rock Joints ◽  
Joint Surface ◽  
Influence Coefficient ◽  
Test Results ◽  
Bolted Joint ◽  
Joint Shear Strength

Bolt is popular in the reinforcement of geotechnical engineering, which can significantly improve the strength and stability of jointed rock mass. For bolted joint, the bolting area is a certain scope instead of the entire joint surface; therefore, it is necessary to study the effect of bolt influencing area on the shear strength of rock joints. In this paper, a series of laboratory direct shear tests were executed on the bolted joints to explore the influence of bolts on the joint shear strength, as well as the influencing area of bolt. Via successively changing bolting angle and bolt number, the shear stress-shear displacement curves of bolted joints were recorded and the variation law of shear strength was analyzed. Based on the assumption of the circular influencing area of bolt, the influence coefficient m (defined as the diameter ratio of the influencing area to the bolt) was introduced to establish the theoretical calculation model of the shear strength of bolted joint, which was verified by test results. Furthermore, the value of m was changed, and the shear strengths of bolted joints under different bolting condition were calculated to compare with the test results. The average relative error Eave was selected to determine the optimal value of m under the corresponding bolting condition, and it tends to sufficiently small values under the case of m > 30 for one-bolted joint and m > 25 for two-bolted joint, as well as m > 20 for three-bolted joint, which demonstrates that m can be applied to effectively calculate the actual influencing area of bolt.

Empirical Shear Strength Criterion for Rock Joints Based on Joint Surface Degradation Characteristics During Shearing

2020 ◽  
Vol 53 (8) ◽  
pp. 3609-3624
Author(s):  
Liu He ◽  
Zhiming Zhao ◽  
Jiayi Chen ◽  
Diyi Liu
Keyword(s):  
Shear Strength ◽  
Strength Criterion ◽  
Rock Joints ◽  
Joint Surface ◽  
Surface Degradation ◽  
Shear Strength Criterion

Ore Volume Measurement Based on 3D Laser Scanning Technique: a Case Study

2012 ◽  
Vol 610-613 ◽  
pp. 3708-3714
Author(s):  
Tien Thanh Nguyen ◽  
Xiu Guo Liu ◽  
You Huang ◽  
Hong Ping Wang ◽  
Quoc Lap Kieu ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Laser Scanner ◽  
Mining Industry ◽  
Original Data ◽  
Volume Measurement ◽  
3D Laser Scanning ◽  
Noise Elimination ◽  
Cloud Data ◽  
Data Registration ◽  
Scanning Technique

In the mining industry, conventional methods such as GPS and total station technology are used most extensively for data collection and in return used to compute volume of extracted materials (ore and waste). In situation where the ore body is bigger in size, and changes dynamically, the use of conventional method to measure volume of ore is not practicable and economically viable because of the workload involved, precision and accuracy of the survey and safety of workers. In this paper a method and work flow of ore heap volume measurement by using 3D laser scanning technique to acquire point cloud data was introduced. RiSCAN PRO and Geomagic studio was used to process the original data (registration, noise elimination, georeferencing, resampling etc.), 3D modeling and volume computations. A comparison on precision of geodetic control points coordinate measured by GPS receivers and 3D laser scanner was carried out. The results indicate that 3D laser scanning technique can effectively be applied to ore output volume measurement since it satisfies the requirement of ore volume measurement.

scholarly journals 3D LASER SCANNING TECHNIQUE FOR THE INSPECTION AND MONITORING OF RAILWAY TUNNELS

2017 ◽  
Vol 10 (SE) ◽  
pp. 73-84 ◽  
Author(s):  
Han-Mei CHEN ◽  
Cristian ULIANOV ◽  
Ramy SHALTOUT
Keyword(s):  
Laser Scanning ◽  
3D Laser Scanning ◽  
Scanning Technique

Gully morphological characteristics in the loess hilly-gully region based on 3D laser scanning technique

2018 ◽  
Vol 43 (8) ◽  
pp. 1701-1710 ◽  
Author(s):  
Hongyan Wu ◽  
Ximeng Xu ◽  
Fenli Zheng ◽  
Chao Qin ◽  
Xu He
Keyword(s):  
Laser Scanning ◽  
Morphological Characteristics ◽  
3D Laser Scanning ◽  
Scanning Technique
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