An enhanced index for evaluating natural joint roughness considering multiple morphological factors affecting the shear behavior

Song, Leibo; Jiang, Quan; Li, Lifu; Liu, Chang; Liu, Xiao‐pei; Xiong, Jun

doi:10.1007/s10064-019-01700-1

Cited by 20 publications

(4 citation statements)

References 40 publications

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“…They discovered that the lowest peak strength and elastic modulus were observed at an inclination angle of approximately 45°. ; Ma et al, (2020) and Song et al, (2019) identified the inclination angle of rock joints as a crucial indicator for evaluating shear behavior. They found a positive correlation between the shear strength of rock joints and the inclination angle of the joint surface.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Failure Characteristics and Crack Propagation Laws of Rocks with Various Joint Angles under Hydro-Mechanical Coupling

Zhang,

Song,

Zhang

et al. 2024

Preprint

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With the increasing depth of coal resource extraction, the surrounding rock in deep engineering faces a geological-mechanical environment characterized by high in-situ stress and elevated water pressure. Investigating the damage evolution and crack propagation patterns in jointed rock masses under the coupled effects of water and stress is crucial for understanding the destabilization and failure mechanisms of deep rock masses. This study employs equipment such as the ROCK TEST SYSTEM 816.01 shear apparatus and a force-thermal-water coupled shear test system to conduct a comprehensive investigation into the damage characteristics and shear crack propagation patterns of granite with varying joint angles under hydraulic coupling conditions.The research findings indicate that the injection of water pressure can effectively reduce the peak shear strength of granite by lowering the effective normal stress. As the joint angle increases, the peak shear strength of the specimens exhibits an overall "n"-shaped trend, with shear displacement showing a reversed "s"-shaped pattern, initially increasing, then decreasing, and increasing again at the peak. Both joint angle and water pressure significantly influence the damage incurred during the granite fracture process. With an increasing joint angle, the damage in the specimens demonstrates an initial increase, followed by a decrease, and then another increase. However, under the influence of water pressure, the damage in the specimens is higher compared to those without water pressure. The damage growth rate under water pressure follows a trend of initially increasing and then decreasing, with the maximum damage growth rate occurring at a joint angle of 30°.Furthermore, numerical simulations using the FRACOD software are conducted to simulate shear fracturing for the Yangba well in Enhanced Geothermal Systems (EGS) geothermal engineering. The results of the simulation calculations hold significant guidance for selecting wellbore positions in the target area of hot dry rocks.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Shear Failure Characteristics and Crack Propagation Laws of Rocks with Various Joint Angles under Hydro-Mechanical Coupling

Zhang,

Song,

Zhang

et al. 2024

Preprint

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“…There are two methods to describe the surface morphological characteristics of joint, namely, 2D parameter description and 3D parameter description (Ge et al 2012;Song et al 2020;Du et al 2022). 2D parameter description method usually selects multiple cross-sections on the surface of joint, and uses the 2D parameters average value of multiple cross-sections to represent the whole joint surface characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the fact that the surface of real joint is three-dimensional, some characteristic points of joint will be missed when using the 2D parameter method to evaluate its morphological characteristics, which will lead to incomplete description of joint surface characteristics. To solve this problem, some scholars have put forward 3D roughness algorithms which consider the 3D morphological characteristics of joints (Ge et al 2012;Song et al 2020;Belem et al 2000;Grasselli et al 2002;Cai Y et al 2018;Tatone & Grasselli. 2009;Chen et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Current measurement equipment for obtaining surface data of joint include probe profiler (Barton & Choubey.1977;Weissbach.1978;Dong & Balasubramaniam. 2013;Du.1992), laser scanner (Ge et al 2012;Belem et al 2000;Grasselli et al 2002) and white light scanner (Song et al 2020;Song et al2021;Song et al2017). Probe profiler is to obtain the surface information of joint through the movement of probe on the instrument.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation method of local failure characteristics for joint based on white light scanning technology

Song

Zhang²,

Wang³

et al. 2022

Nat Hazards

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Joint is one of the important factors affecting the stability of engineering rock mass. To quantitatively analyze the local failure characteristics of joint, the point cloud data of its morphology before and after shear were obtained by 3D white light scanning technology. Firstly, the problem of cloud surface skew of point cloud data was solved by constructing rotation matrix and translation matrix based on the principle of least square method, and the datum plane of joint was determined. Then, the datum plane of the joint before and after shear was adjusted to be consistent based on the point cloud data of the marked points and the undamaged area of the joint, and the point cloud data with equal spacing were obtained by one-dimensional or two-dimensional interpolation algorithm. Finally, a 3D description method of joint local Morphological characteristics is proposed. The proposed method can determine the scope of surface failure of joint, quantitatively analyze the locality of its failure characteristics, and provide data support for distinguishing the types of shear failure and further research on shear mechanism.

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Three-dimensional Criterion for Predicting Peak Shear Strength of Matched Discontinuities with Different Joint Wall Strengths

2021

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An enhanced index for evaluating natural joint roughness considering multiple morphological factors affecting the shear behavior

Cited by 20 publications

References 40 publications

Experimental Study on Shear Failure Characteristics and Crack Propagation Laws of Rocks with Various Joint Angles under Hydro-Mechanical Coupling

Experimental Study on Shear Failure Characteristics and Crack Propagation Laws of Rocks with Various Joint Angles under Hydro-Mechanical Coupling

Evaluation method of local failure characteristics for joint based on white light scanning technology

Three-dimensional Criterion for Predicting Peak Shear Strength of Matched Discontinuities with Different Joint Wall Strengths

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