Investigation on the shear properties of discontinuities at the interface between different rock types in the Badong formation, China

Wu, Qiong; Xu, Yanjun; Tang, Huiming; Fang, Kun; Jiang, Yaofei; Liu, Chaoyuan; Wang, Liangqing; Wang, Xiaohan; Kang, Jintao

doi:10.1016/j.enggeo.2018.09.002

Cited by 45 publications

(13 citation statements)

References 32 publications

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“…He et al (2010) conducted a true triaxial single-face dynamic unloading test on limestone to investigate its acoustic emission (AE) characteristics and found AE signals with a high amplitude and low frequency before the test sample was broken. A direct shear test was also used to study bedding planes formed by purplish-red mudstone and argillaceous limestone from the Three Gorges Reservoir Area (Wu et al, 2018). Results illustrated that bedding planes between intensively weathered mudstone and slightly weathered limestone were the most dangerous potential sliding planes.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Laboratory Study On Mechanical Response And Failure Mechanism of Red-Bed Soft Rock Under Water-Rock Interaction

Chi

Liu

Sun

et al. 2021

Preprint

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Red-bed soft rock is a geomaterial that displays special deformation and failure characteristics. The stability of red-bed slopes can be negatively impacted by water and stepped excavation disturbance; however, there is limited research regarding the mechanical behavior and failure characteristics of red-bed soft rock under the action of water-rock hydro-mechanical coupling. In this study, to explore the mechanical response and failure mechanisms of red-bed soft rock under coupled water-rock hydro-mechanical action, a visual experimental platform based on digital radiography and a multi-level loading device was constructed. Angiography was used to visualize the rock fracture process by replacing fissure water with a contrast medium. Multi-level loading was applied to cubic red-bed mudstone samples, and acoustic emission signals, stress, flow rate, and digital radiography images were collected during the failure process. An original image processing method based on Hough transform and a convolutional neural network was used to segment and extract cracks from the imagery, and fissure water flow characteristics, rock mechanical response, and crack evolution were analyzed in detail (Liu et al., 2015; Lv et al., 2013, 2014). Results showed that when the Felicity ratio FR was lower than 1.2, water could induce secondary "water-damaged cracks" in the red-bed samples. Study findings were used to highlight the importance of improved early-warning methods for rainfall-induced landslides at an engineering scale. The original experimental platform proposed and evaluated in this study provides a new and powerful tool to investigate the mechanical behavior of different rock types under the action of water-rock hydro-mechanical coupling at a laboratory scale. These findings will facilitate improved disaster prevention strategies for red-bed geological bodies.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Laboratory Study On Mechanical Response And Failure Mechanism of Red-Bed Soft Rock Under Water-Rock Interaction

Chi

Liu

Sun

et al. 2021

Preprint

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“…According to the International Society for Rock Mechanics [ 26 ], the size and shape of the specimen for the laboratory determination of the shear strength of the rock joint are recommended to have a regular cross section, and the width of the test plane should be at least 48 mm. According to the commonly used direct shear apparatus, square-shaped specimens with side lengths of 100 or 150 mm were mainly used [ 27 , 28 ]. For the texture of the rock joint surface, textures with dull colors and repeating or symmetrical patterns may cause the resultant 3D model to be incomplete, decrease the accuracy of the model, and even lead to 3D reconstruction failure.…”

Section: Methodsmentioning

confidence: 99%

Measurement of Rock Joint Surfaces by Using Smartphone Structure from Motion (SfM) Photogrammetry

Fang

Jiang

et al. 2021

Sensors

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The measurement of rock joint surfaces is essential for the estimation of the shear strength of the rock discontinuities in rock engineering. Commonly used techniques for the acquisition of the morphology of the surfaces, such as profilometers and laser scanners, either have low accuracy or high cost. Therefore, a high-speed, low-cost, and high-accuracy method for obtaining the topography of the joint surfaces is necessary. In this paper, a smartphone structure from motion (SfM) photogrammetric solution for measuring rock joint surfaces is presented and evaluated. Image datasets of two rock joint specimens were taken under two different modes by using an iPhone 6s, a Pixel 2, and a T329t and subsequently processed through SfM-based software to obtain 3D models. The technique for measuring rock joint surfaces was evaluated using the root mean square error (RMSE) of the cloud-to-cloud distance and the mean error of the joint roughness coefficient (JRC). The results show that the RMSEs by using the iPhone 6s and Pixel 2 are both less than 0.08 mm. The mean errors of the JRC are −7.54 and −5.27% with point intervals of 0.25 and 1.0 mm, respectively. The smartphone SfM photogrammetric method has comparable accuracy to a 3D laser scanner approach for reconstructing laboratory-sized rock joint surfaces, and it has the potential to become a popular method for measuring rock joint surfaces.

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“…Based on these shear tests, researchers have informed attempts to establish theoretical and empirical shear strength criteria for the interface between geotechnical materials and structures (Gómez et al, 2003;Kosoglu et al, 2010;Kang and Liao, 2019;Kang et al, 2021). These include shear strength models for the interface between different rock types (Patton, 1966;Barton, 1973;Grasselli and Egger, 2003;Cottrell, 2009;Wu et al, 2018), rock and concrete (Andjelkovic et al, 2015;Krounis et al, 2016), soil and concrete (Gómez et al, 2003;Yazdani et al, 2019), and soil and geotextile (Esterhuizen et al, 2001;Iryo and Rowe, 2005;Tolooiyan et al, 2009;Portelinha and Zornberg, 2017). Due to the non-linear change in interfacial shear strength, new guidelines for shear model development consider the effect of the interface morphology on shear strength.…”

Section: Introductionmentioning

confidence: 99%

An Empirical Shear Model of Interface Between the Loess and Hipparion Red Clay in a Loess Landslide

Zhu

Shuaisheng

et al. 2022

Front. Earth Sci.

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Quaternary loess is widely distributed over the tertiary Hipparion red clay on the Loess Plateau of China. Large-scale loess landslides often occur along the weak contact interface between these two sediment materials. To investigate the failure mode and shear strength characteristics of the loess–Hipparion red clay contact interface, a series of shearing experiments were performed on interface specimens using purpose-built shear equipment. In this article, the relationship between shear strength and interface morphology is discussed, and an empirical shear model of the interface is proposed based on the experimental results and theoretical work. The results indicate that discontinuities between the loess and the Hipparion red clay reduce the shear strength of specimens significantly. The contribution of the contact interface to shear performance including failure mode, shear deformation, and shear strength varies with the interface morphology and the applied normal stress. With low interface roughness or normal stress, sliding failure is likely to occur. With increasing interface roughness and normal stress, the peak strength increases rapidly. With further increase in the interface roughness and normal stress, the increment of peak strength decreases gradually as the failure mode transitions from sliding mode to cutoff mode. A staged shear model that takes the failure mode into consideration is developed to express the non-linear change in the interface shear strength. The shear model’s capability is validated by comparing model estimates with experimental data. This work improves our understanding of shear mechanisms and the importance of considering the effects of interfacial properties in the mechanical behavior of contact interfaces.

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Investigation on the shear properties of discontinuities at the interface between different rock types in the Badong formation, China

Cited by 45 publications

References 32 publications

WITHDRAWN: Laboratory Study On Mechanical Response And Failure Mechanism of Red-Bed Soft Rock Under Water-Rock Interaction

WITHDRAWN: Laboratory Study On Mechanical Response And Failure Mechanism of Red-Bed Soft Rock Under Water-Rock Interaction

Measurement of Rock Joint Surfaces by Using Smartphone Structure from Motion (SfM) Photogrammetry

An Empirical Shear Model of Interface Between the Loess and Hipparion Red Clay in a Loess Landslide

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