Experiment on Rockburst Process of Borehole and Its Acoustic Emission Characteristics

Hu, Xiaochuan; Su, Guoshao; Chen, Guanyan; Mei, Shiming; Feng, Xia‐Ting; Mei, Guoxiong; Huang, Xiaohua

doi:10.1007/s00603-018-1613-z

Cited by 154 publications

(47 citation statements)

References 42 publications

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“…It may be due to local damage in the area where the future failure plane may be formed, resulting in irreversible deformation. Equation (1) shows that the lateral strain of sandstone is determined by the Poisson's effect, that is, lateral deformation ability of sandstone and axial displacement. With the further loading of axial stress, the axial strain continued to increase, showing that the sandstone was compressed in the axial direction.…”

Section: Experimental Schemementioning

confidence: 99%

“…With the further loading of axial stress, the axial strain continued to increase, showing that the sandstone was compressed in the axial direction. Equation (1) shows that the lateral strain of sandstone is determined by the Poisson's effect, that is, lateral deformation ability of sandstone and axial displacement. The cyclic loading peak and number of axial stress designed in the experiment did not result in the yielding of the sandstone.…”

Section: Experimental Schemementioning

confidence: 99%

“…In rock engineering activities, cyclic loading-unloading is a common stress loading path, for example, the coal pillar subjected to periodic loading-unloading behavior undermining perturbation, the strata movement caused by the periodic weighting above the working face, the dynamical changes in radial stress and circumferential stress in roadway excavation, 1 the load acting on the railways, roads, and bridges as foundations, and the slope rock mass under periodic large fluctuation of reservoir water.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on strain behavior and permeability evolution of sandstone under constant amplitude cyclic loading‐unloading

Liu

Zhang

et al. 2019

Energy Science & Engineering

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The coupling of in situ stress, seepage, and fracture makes the strata exhibit complex strain behavior and permeability evolution under the stress path of cyclic loading-unloading. In this study, the cyclic loading-unloading experiments of constant amplitude axial stress of sandstone under the combination of different initial confining pressures and loading-unloading rates are conducted. The experimental resultsshow that the heterogeneity of sandstone, Poisson's ratio produced by adjacent loading-unloading, and confining pressure determine the deformation characteristics of sandstone in lateral and axial directions. Sandstone can produce significant shear dilatancy at a low rate; this is because stress perturbation can activate more particle slippage and fracture structure changes. However, the fracture preferentially propagates along the end or edge of the crack with strong stress sensitivity to form a shear failure plane at high rate. The normalized permeability of sandstone decreases with an increase in the loading-unloading rate before failure. The evolution of normalized permeability is closely related to the shear slip of fracture structure and sandstone particles. For the prevention of rock engineering disasters, the high loading-unloading rate results in lower normalized permeability, which favors the prevention of gastype disasters in rocks with higher gas potential energy; however, it is not conducive to the prevention of rockburst. K E Y W O R D Sconstant amplitude cyclic loading-unloading, loading-unloading rate, normalized permeability, shear effect, volumetric strain | 453 LIU et aL.

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Section: Experimental Schemementioning

confidence: 99%

Section: Experimental Schemementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study on strain behavior and permeability evolution of sandstone under constant amplitude cyclic loading‐unloading

Liu

Zhang

et al. 2019

Energy Science & Engineering

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“…For experimental laboratory studies examining underground roadway structure, most scholars adopt the method of opening holes in rock blocks to simulate actual roadway excavation and failure (rockburst) [20][21][22][23][24][25][26][27][28][29][30][31][32]. For example, Fakhimi et al [22] simulated brittle failure of roadway surrounding rock caused by excavation of an underground roadway using biaxial loading of sandstone.…”

Section: Introductionmentioning

confidence: 99%

“…Gong et al [31] also discussed the different spalling phenomena of the hole under four different initial stress states. Hu et al [32] applied biaxial loading to granite samples containing a hole, and the acoustic emission (AE) characteristics of circular hole in the process of rockburst were obtained. e shape of the cavity will have a certain impact on roadway failure [33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Rockburst in Sandstone Containing Elliptic Holes with Varying Axial Ratios

Wang

Liu

et al. 2019

Advances in Materials Science and Engineering

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Rockburst disaster is one of the prominent problems faced by deep underground engineering. In this study, rockburst in four elliptical holes with different axial ratios in sandstone under biaxial loading is studied as an analogue for underground roadways. Video and acoustic emission (AE) equipment is used to monitor the biaxial loading tests. Experimental results indicate that each of the elliptical holes goes through four stages: quiet period, small particle ejection, spalling, and rockburst. The duration of quiet and spalling periods increased with increasing axial ratio of ellipse. The duration of the ejection and rockburst periods remains unchanged. All the four elliptical holes have V-shaped pits after rockburst occurs. The fragments produced during rockburst are divided into coarse, medium, fine, and micro grains. The quantity of coarse and medium grains increases with increasing axial ratio. The mass ratio of coarse and medium grains increases and that of fine and micro grains decreases. The depth, angle, and area of the V-shaped pits decrease with increasing axis ratio. Tensile cracks play an important role in rockburst failure. Tensile cracks are the dominant crack types formed during rockburst and account for over 70% of all cracks in the samples. The number of tensile cracks increased and the number of shear cracks decreased. This paper has some reference value for practical engineering design and prevention of rockburst.

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Theoretical analysis of drilling cuttings considering stress zoning of surrounding rock and its application in stress detection

Geng

Tan

Yin

et al. 2023

Energy Science & Engineering

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Drilling cuttings method is a commonly used method to detect the risk of rockburst, which has been widely recognized and applied in coal mines.However, in the current theoretical research on the relationship between drilling cuttings method and coal stress, it is generally considered that the mechanical parameters of coal at different positions of roadway are unchanged, and the influence of surrounding rock plastic zone and elastic zone is not considered. Therefore, according to the secondary distribution characteristics of roadway side stress, the theoretical calculation formula of drilling cuttings in the plastic zone and elastic zone of the roadway side is established in this paper. The example shows that the distribution of cuttings on the roadway side is obviously consistent with the abutment pressure. The cuttings in the plastic zone and the elastic zone are in linear and power function with the coal stress, respectively, and the cuttings in the plastic zone are greater than those in the elastic zone. With the increase of the hole diameter, the slope of the relationship curve between the drill-cutting weight and stress gradually increases, and the response of the drill-cutting weight with a large hole diameter to the change of coal stress is more obvious. The numerical simulation results show that the error of the theoretical calculation formula of the drilling cuttings method is less than 9%, which can meet the engineering application needs of estimating the drill-cutting weight in coal and the stress of coal. Using the theoretical formula, the stress field in the leading area of the working face is measured, and the leading influence range and the accurate position of the high stress concentration area are determined, which provides more comprehensive stress information for the early warning of impact danger and pressure relief.

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Experiment on Rockburst Process of Borehole and Its Acoustic Emission Characteristics

Cited by 154 publications

References 42 publications

Experimental study on strain behavior and permeability evolution of sandstone under constant amplitude cyclic loading‐unloading

Experimental study on strain behavior and permeability evolution of sandstone under constant amplitude cyclic loading‐unloading

Rockburst in Sandstone Containing Elliptic Holes with Varying Axial Ratios

Theoretical analysis of drilling cuttings considering stress zoning of surrounding rock and its application in stress detection

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