Damage characteristics of sandstone subjected to pre-peak and post-peak cyclic loading

Zhang, Yubao

doi:10.13168/agg.2019.0011

Cited by 14 publications

(10 citation statements)

References 36 publications

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“…Using this quantification method (Meng et al, 2016), investigated the characteristics of rock energy dissipation under uniaxial compression condition and found the energy densities increase nonlinearly with increasing axial loading stress and then rapidly increases after rock failure, the dissipated energy is generally less than the elastic energy at the peak phase, and exceeds the elastic energy at some point after the peak. Similar energy dissipation characteristics were also observed in rock under triaxial compression condition (Zhang et al, 2017;Zhang et al, 2019). However, in actual rock uniaxial compression tests, due to the uncertainty of peak strength of rock, it is hard to unload at or near the peak strength of the rock specimen.…”

Section: Introductionsupporting

confidence: 73%

A model for rock dissipated energy estimation based on acoustic emission measurements

et al. 2023

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The temporal domain of dissipated energy during rock damage and failure is commonly quantified using loading and unloading tests or elastic mechanics-based theoretical calculation methods. However, these approaches cannot be applied to obtain the spatial distribution of rock dissipated energy. This paper presents a novel model to estimate rock dissipated energy based on acoustic emission measurements. The proposed model is used to estimate the temporal and spatial distribution of dissipated energy in a sandstone specimen under uniaxial compression conditions. The results indicate that the model well describes the energy dissipation evolution trend in the temporal domain with an error of 38.63% compared with results calculated using the traditional method. The dissipated energy concentration area estimated by the model is located near the macroscopic fractures, which indicates that the model can describe the evolution process of rock energy dissipation in the spatial domain.

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Section: Introductionsupporting

confidence: 73%

A model for rock dissipated energy estimation based on acoustic emission measurements

et al. 2023

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“…The stability of the surrounding rock in a roadway is of great significance to ensure the safety of people and equipment during the coal mining. The mechanical properties and stress distribution of the surrounding rock greatly affect the deformation and damage of roadway 1–4 . However, the coal bumps frequently occur in the coal roadway due to the high ground stress and the strong mining disturbing 5–9 .…”

Section: Introductionmentioning

confidence: 99%

Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

Yin

Zhang

et al. 2023

Energy Science & Engineering

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The pressure relief with large-diameter boreholes is one of the effective methods to prevent coal bumps in deep coal roadway. An unreasonable pressure relief design can cause the rockbolt support failure and aggravate the deformation of the surrounding rocks. In this paper, a coupling model of roadway sidewall considering borehole pressure relief and rockbolt support was established. The influence of the destressing borehole diameter on the rockbolt located in the plastic zone and the roadway deformation was studied by theoretical calculation and numerical simulation. The results show that there is a critical zone of the borehole diameter for the influence on the rockbolt normal stress and roadway convergence. When the destressing borehole diameter exceeds the critical zone, the rockbolt normal stress decreases sharply. Considering the existence of the broken zone in the surrounding rock, the bolehole diameters in the critical zone increase with the increase of the distance between the borehole and the rockbolt, the residual strength, and decrease with the increase of initial stress. In the engineering analysis, with the increase of the destressing borehole diameter, the ultimate pullout force of rockbolt decrease, and the plastic zone of surrounding rock, the roadway deformation, the maximum axial force, and slippage of the rockbolt all increase. Therefore, to better keep the stability of the surrounding rock in coal roadway, the borehole pressure relief needs to be coordinated with the rockbolt support. The destressing borehole diameter in the pressure relief design should not be greater than the critical zone.

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“…e integrity of the coal seam in water injection section is damaged under a certain water pressure. Affected by the mechanical properties [10][11][12], water injection method [13,14], and distribution of rock strata [15][16][17], the propagation form of coal fractures will be different [18,19]. Coal damage caused by water pressure changes the stress distribution of the roadway sidewall [20,21].…”

Section: Introductionmentioning

confidence: 99%

A Study on Stress Redistribution of Roadway Sidewall after Hydraulic Fracturing in Coal Bumps Prevention

Yin

Tang

Zhang

et al. 2022

Shock and Vibration

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Hydraulic fracturing is an effective mean to prevent coal bumps in deep coal mining. The calculation of stress redistribution of coal sidewall after hydraulic fracturing can evaluate the fracturing effect and provide a reference for the hydraulic fracturing scheme design. In this paper, a theoretical model of stress redistribution of roadway sidewall after hydraulic fracturing is established with considering the effect of crushing zone. And the influences of the water injection length and the fracturing radius on the stress redistribution of roadway sidewall are investigated. The results show that the water injection section should be set at a deeper position with considering the existence of the crushing zone. The coal roadway sidewall after hydraulic fracturing is divided into five zones: the crushing zone, the shallow plastic zone, the pressure relief zone, the deep plastic zone, and the elastic zone. The stress redistribution law is obviously affected by the water injection section length and fracturing radius. With the increase of water injection length or fracturing radius, the pressure relief effect is more evident, but the axial force of rockbolt increases gradually. In order to acquire a better pressure relief effect, the matching of the water injection length and the fracturing radius should be considered crucially in the hydraulic fracturing design for preventing coal bumps.

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Damage characteristics of sandstone subjected to pre-peak and post-peak cyclic loading

Cited by 14 publications

References 36 publications

A model for rock dissipated energy estimation based on acoustic emission measurements

A model for rock dissipated energy estimation based on acoustic emission measurements

Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

A Study on Stress Redistribution of Roadway Sidewall after Hydraulic Fracturing in Coal Bumps Prevention

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