A Novel Method for Determining the Three-dimensional Roughness of Rock Joints Based on Profile Slices

Wang, Changshuo; Rui, Yong; Luo, Zhiwei; Du, Shigui; Karakus, Murat; Huang, Chuxia

doi:10.1007/s00603-023-03274-7

Cited by 15 publications

(5 citation statements)

References 43 publications

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“…During the underground engineering excavation, the surrounding rock will inevitably experience an initial damage under the disturbance, resulting in a damaged area with poor mechanical properties (Nick et al, 2023;Wang et al, 2023). At the same time, under the long-term effect of a constant load, the surrounding rock with different kinds of damage in the damaged areas will show more obvious rheological phenomena, which results in the gradual decrease of the elastic modulus and strength of the surrounding rock.…”

Section: Coupling Damage Constitutive Modelmentioning

confidence: 99%

Research on the widths of protective coal pillars in main roadway based on the damaged foundation beam model

Yu,

Feng,

Cheng

2024

Front. Earth Sci.

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Long-term stability of the protective coal pillars in coal mines can ensure normal and safe use of roadways; in turn, the integrity of the roadway plays an important role in safe and efficient mining in coal mines. The initial damage and rheological damage caused by coal-seam excavation disturbance have important influences on the selection of reasonable widths of the protective coal pillars. Based on damage mechanics and the theory of elastic foundation beams, a coupled damage constitutive relationship of rock-like materials is proposed in this work by considering the influence of threshold and residual strength to establish the mechanical model of the elastic damage foundation beam. By theoretical analysis and numerical calculation, the differential equation of the deflection curve of the beam is solved, the influence range of the advance abutment pressure under the condition of coupling damage is obtained, and the width of the protective coal pillar is determined. The results show that compared with the elastic foundation beam model, after considering the coupling damage of coal, the influence range of the advance abutment pressure increases with time over a certain duration. At the end of this duration, the influence range of the advance abutment pressure remains almost unchanged. For the case considered in this paper, the long-term stability of the roadway is guaranteed when the width of the coal pillar is 120 m. The potential interference or change related to the specific situation of the site can be studied by changing the relevant parameters in the model to study different working conditions, or the damage of the roof rock beam during the mining process of the working face can be considered, which will be the subject of further research in the future.

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Section: Coupling Damage Constitutive Modelmentioning

confidence: 99%

Research on the widths of protective coal pillars in main roadway based on the damaged foundation beam model

Yu,

Feng,

Cheng

2024

Front. Earth Sci.

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“…The contact methods, including the needle profilometer method, the compass and disc clinometer method, the straight edges and ruler method, and the linear profiling method, are laborious, time-consuming, and prone to human error [12][13][14]. Though some researchers have made modifications to these methods and increased their measurement efficacy, contact-based measurement methods still require personnel to work on hazardous slopes, which poses significant safety risks [15,16]. Non-contact measurement techniques do not necessitate physical contact with the joint surface, so they do not change or injure the surface.…”

Section: Introductionmentioning

confidence: 99%

Drone Photogrammetry for Accurate and Efficient Rock Joint Roughness Assessment on Steep and Inaccessible Slopes

Song,

Du,

Yong

et al. 2023

Remote Sensing

Self Cite

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The roughness of rock joints exerts a substantial influence on the mechanical behavior of rock masses. In order to identify potential failure mechanisms and to design effective protection measures, the accurate measurement of joint roughness is essential. Traditional methods, such as contact profilometry, laser scanning, and close-range photogrammetry, encounter difficulties when assessing steep and inaccessible slopes, thus hindering the safety and precision of data collection. This study aims to assess the feasibility of utilizing drone photogrammetry to quantify the roughness of rock joints on steep and inaccessible slopes. Field experiments were conducted, and the results were compared to those of 3D laser scanning in order to validate the approach’s procedural details, applicability, and measurement accuracy. Under a 3 m image capture distance using drone photogrammetry, the root mean square error of the multiscale model-to-model cloud comparison (M3C2) distance and the average roughness measurement error were less than 0.5 mm and 10%, respectively. The results demonstrate the feasibility and potential of drone photogrammetry for joint roughness measurement challenges, providing a useful tool for practitioners and researchers pursuing innovative solutions for assessing rock joint roughness on precipitous and hazardous slopes.

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“…This can reflect the 3D characteristics of the discontinuity. Based on this, Wang et al [12] used the slices to predict the roughness of discontinuity and proposed the concept of the required minimum number (RMN) of slices, with the consideration of the difficulty in acquiring such slices in engineering. For calculating the roughness of slices, 3D statistical parameters θ s , R s , and Z 2s , which can be used to depict the inclination and size of the asperities, are adopted [12].…”

Section: Introductionmentioning

confidence: 99%

“…Based on this, Wang et al [12] used the slices to predict the roughness of discontinuity and proposed the concept of the required minimum number (RMN) of slices, with the consideration of the difficulty in acquiring such slices in engineering. For calculating the roughness of slices, 3D statistical parameters θ s , R s , and Z 2s , which can be used to depict the inclination and size of the asperities, are adopted [12]. However, the values of 3D statistical parameters depend on the sampling interval, which is not a desirable feature for quantifying the roughness [13].…”

Section: Introductionmentioning

confidence: 99%

A New Perspective on Predicting Roughness of Discontinuity from Fractal Dimension D of Outcrops

et al. 2023

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In tunnel construction, predicting the roughness of discontinuity is significant for preventing the collapse of the excavation face. However, currently, we are unable to use a parameter with invariant properties to quantify and predict the roughness of discontinuity. Fractal dimension D is one such parameter that be used to characterize the roughness of discontinuity. The study proposes a new method to predict the roughness of discontinuity from the fractal dimension D of outcrops. The measurement method of the coordinates of outcrops is firstly summarized, and the most suitable method of calculating fractal dimension D is then provided. For characterizing the spatial variability of fractal dimension D, the random field of fractal dimension D is discretized, and the prediction model is then established based on Bayesian theory. The proposed method is applied to one tunnel for predicting the roughness of discontinuity, and the results indicate that the relative errors of prediction are less than 1.5%. The sensitivities of correlation function and discontinuity size are analyzed. It is found that the different correlation functions have no obvious effect on the prediction results, and the proposed method is well applied to relatively large sizes of discontinuity.

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A Novel Method for Determining the Three-dimensional Roughness of Rock Joints Based on Profile Slices

Cited by 15 publications

References 43 publications

Research on the widths of protective coal pillars in main roadway based on the damaged foundation beam model

Research on the widths of protective coal pillars in main roadway based on the damaged foundation beam model

Drone Photogrammetry for Accurate and Efficient Rock Joint Roughness Assessment on Steep and Inaccessible Slopes

A New Perspective on Predicting Roughness of Discontinuity from Fractal Dimension D of Outcrops

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