Rockburst characteristics of several hard brittle rocks: A true triaxial experimental study

Zhai, Shaobin; Su, Guoshao; Yin, Shunde; Zhao, Bin; Yan, Litan

doi:10.1016/j.jrmge.2019.07.013

Cited by 71 publications

(24 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Rockbursts are violent failure forms of hard brittle rocks, which exhibit fractal behaviors in many aspects ( Figure 2), such as microfracturing (Figure 2(a)) [32], fragmentation distribution of rock samples in the laboratory (Figure 2(b)) [17], and fragmentation distribution on the project site ( Figure 2(c)) [33]. e fracturing process of rockbursts can be illustrated using the fractal geometry of Sierpinski gasket (Figure 2…”

Section: Application Of Fractal Theory In Studying Rockburstsmentioning

confidence: 99%

“…However, according to Figure 12(c) and literature [4,5], the weak seismically induced rockbursts mainly undergo tensile splitting failure, and the rock sample is cut into several large thick rock slabs along the vertical direction. Microscopically, tensile cracks usually correspond to intergranular failure and shear cracks usually correspond to transgranular failure [16,18,20,32]. Macroscopically, tensile cracks are usually vertical and straight, and shear cracks are usually oblique and irregular [5,28,32,35].…”

Section: Characteristics and Mechanisms Of Different Types Ofmentioning

confidence: 99%

“…Microscopically, tensile cracks usually correspond to intergranular failure and shear cracks usually correspond to transgranular failure [16,18,20,32]. Macroscopically, tensile cracks are usually vertical and straight, and shear cracks are usually oblique and irregular [5,28,32,35]. erefore, from the perspective of fractal geometry, the fractal dimension of the relatively simpler tensile cracks is less than that of shear cracks.…”

Section: Characteristics and Mechanisms Of Different Types Ofmentioning

confidence: 99%

“…Fractal characteristics of rockbursts at different scales: (a) microcracking indicated by SEM image[32], (b) fragmentation distribution of rockburst sample fragments[17], (c) fragmentation distribution of the ejected fragments of an in situ rockburst[33], and (d) illustration of rockburst fracturing process with the Sierpinski gasket.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Fractal Analysis of Fragmentation Distribution of Rockbursts Induced by Low‐Frequency Seismic Disturbances

Zhang

Liang

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Low-frequency seismic disturbances frequently induce violent rockburst hazards, seriously threatening the safety of deep excavation and mining engineering. To investigate the characteristics and mechanisms of rockbursts induced by seismic disturbances, in this study a series of true triaxial experiments, including the moderate seismically induced, the weak seismically induced, and the self-initiated rockburst experiments under different conditions were conducted. The fractal geometry theory was applied to study rockbursts and the fractal dimensions of fragmentation distribution of different types of rockbursts were calculated. The results show that the fragmentation distributions of both the seismically induced and self-initiated rockbursts exhibit fractal behaviors. For the moderate seismically induced rockbursts, as the static stresses (i.e., the maximum and minimum static stresses) and disturbance amplitude increase, the fractal dimension increases, whereas, as the disturbance frequency increases, the fractal dimension decreases first and then increases. Under similar static loading conditions, the moderate seismically induced rockbursts have the largest fractal dimension, followed by the self-initiated rockbursts, and the weak seismically induced rockbursts have the smallest fractal dimension. There is a linear relationship between the average fractal dimension and kinetic energy of these rockbursts, implying that the fractal dimension can serve as an indicator for estimating rockburst intensity. Furthermore, from a fractal point of view, the energy input, dissipation, and release of these rockbursts are all linear processes.

show abstract

Section: Application Of Fractal Theory In Studying Rockburstsmentioning

confidence: 99%

Section: Characteristics and Mechanisms Of Different Types Ofmentioning

confidence: 99%

Section: Characteristics and Mechanisms Of Different Types Ofmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Fractal Analysis of Fragmentation Distribution of Rockbursts Induced by Low‐Frequency Seismic Disturbances

Zhang

Liang

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…The data is listed in Table 4. In addition, the peak-strength strain energy storage index W p et , which was proposed by Gong et al [37], has also been calculated by the following equation: According to the above laboratory tests results [31,40], one can conclude that no injected coal fragments with almost intact sample indicates no burst proneness, a minor ejected fragment with slight ejection sound and some macroscopic cracks means low burst proneness, and a large amount of ejected fragments with loud sound and severely broken sample indicates high proneness. Figure 9 shows the ultimate failure mode of coal specimens under uniaxial compression test.…”

Section: Pj Coal Minementioning

confidence: 99%

A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Liu

et al. 2020

Energies

View full text Add to dashboard Cite

Coal burst is a type of dynamic geological hazard in coal mine. In this study, a modified bursting energy index, which is defined as the ratio of elastic strain energy at the peak strength to the released strain energy density at the post-peak stage, was proposed to evaluate the coal burst proneness. The calculation method for this index was also introduced. Two coal mines (PJ and TJH coal mines) located in Ordos coalfield were used to verify the validity of the proposed method. The tests results indicate that modified bursting energy index increases linearly with increasing uniaxial compressive strength. The parameter A, which is used to fit relation between total input and elastic strain energy density, has a significant effect on the modified bursting energy index. A large value of parameter A means more elastic strain energy before the peak strength while a small value indicates most of input energy was dissipated. Finally, the coal burst proneness of these two coal mines was evaluated with the modified index. The results of modified index are consistent with that of laboratory tests, and more reasonable than that from original bursting energy index because it removed the dissipated strain energy from the total input strain energy density.

show abstract

Research on high‐pressure abrasive water jet slotting and pressure relief technology for hard rock roof

Zhenfei,

Wenbin

2024

Energy Science & Engineering

View full text Add to dashboard Cite

To solve the problem of severe rock pressure near coal mining face tunnels, a high‐pressure abrasive water jet slotting and roof breaking pressure relief technology is proposed. First, the laneway deformation mechanism and the process of hard rock slotting using high‐pressure abrasive water jets under long‐distance cantilever conditions are analyzed, and the crack initiation conditions of roof strata are obtained. Second, slotting tests under different slotting pressures, nozzle diameters, abrasive particle sizes and slotting times were carried out, and the slotting parameters of a high‐pressure abrasive water jet on a typical roof rock were obtained. Finally, industrial application was carried out in the 81,403 working face of Huayang No.1 Mine. After the hydraulic roof slotting measures were implemented in the test area, the maximum axial force of the anchor cable was reduced to 67 kN, which was 35.5% lower than that of the comparison. The average stress of the coal seam was 15 MPa, which was approximately 25% lower than that of the comparison. The deformation of the tunnel in the experimental area was significantly controlled, with an average movement of 30.0% toward the roof and floor of the tunnel and an average movement of 23.2% toward the two sides of the tunnel. Compared with the movement in the comparison section, the movement toward the roof and floor of the laneway was 42.3% lower, and the movement toward the two sides was 38.2% lower. The industrial application results show that high‐pressure abrasive water jet roof slotting and pressure relief technology can cut off the stress transmission path between the roof rock on both sides, effectively improve the stress state of the surrounding rock of the laneway, reduce the deformation of the roof, floor and two sides of the working face in the later stage of the mining laneway.

show abstract

Rockburst characteristics of several hard brittle rocks: A true triaxial experimental study

Cited by 71 publications

References 75 publications

Fractal Analysis of Fragmentation Distribution of Rockbursts Induced by Low‐Frequency Seismic Disturbances

Fractal Analysis of Fragmentation Distribution of Rockbursts Induced by Low‐Frequency Seismic Disturbances

A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Research on high‐pressure abrasive water jet slotting and pressure relief technology for hard rock roof

Contact Info

Product

Resources

About