Energy Storage and Dissipation Evolution Process and Characteristics of Marble in Three Tension-Type Failure Tests

Gong, Fengqiang; Luo, Song; Yan, Jingyi

doi:10.1007/s00603-018-1564-4

Cited by 83 publications

(30 citation statements)

References 30 publications

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“…In fact, the absorption and transformation of energy is the essential cause of rock material failure. [15][16][17][18]. Especially in the dynamic test, the incident energy carried by the incident wave provides the energy source for the failure of rock specimens.…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Gong

2020

Advances in Civil Engineering

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In order to quantitatively investigate the energy dissipation characteristic during the dynamic tension failure of rock materials, the dynamic Brazilian disc tests on red sandstone were conducted using the split Hopkinson pressure bar (SHPB) setup. The states of the specimens after different incident energies can be divided into three forms (i.e., the unruptured state, the ruptured state, and the broken state), and the failure processes of the specimens were recorded by using a high-speed camera. The results show that the ruptured state of the specimen corresponds to the critical failure strain. Taking the critical incident energy as a turning point, two positive linear fitting relations between the dissipated energy and incident energy before and after the point are obtained, and the dynamic linear dissipation law is found. When the incident energy is less than the critical energy, specimens were unruptured after impact. When the incident energy is greater than the critical energy, specimens will be broken after impact. According to the obtained linear energy dissipation law, the dynamic tensile energy dissipation coefficient (DTEDC) was introduced for quantitatively describing the dynamic energy dissipation capacity of rock materials in the dynamic Brazilian disc test. When the specimen is in the unruptured state, the ideal DTEDC is a constant value. When the specimen is in a broken state, the DTEDC increases with the increase of incident energy.

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Section: Introductionmentioning

confidence: 99%

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Gong

2020

Advances in Civil Engineering

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“…The research and development of high-prestressing, high-strength bolt and anchor cable can be used to effectively control roof rock expansion and separation, improve the roof stability, and solve the difficult technical problem for deep gob-side entry support [36][37][38]. Third, the roadside support technology of GER was optimised [39][40][41]. High-water quick-setting materials [42][43][44][45] and paste materials [46][47][48] are widely used because of their high strength and low cost, and they have gradually replaced traditional wooden stacks, intensive individual props, gangue bags, and concrete blocks.…”

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confidence: 99%

Roof Cutting Parameters Design for Gob-Side Entry in Deep Coal Mine: A Case Study

et al. 2019

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Roof cutting is an effective technique for controlling the deformation and failure of the surrounding rock in deep gob-side entry. The determination of the roof cutting parameters has become a popular research subject. Initially, two mechanical models are established for the non-roof-cutting and roof-cutting of gob-side entry in deep mining conditions. On this basis, the necessity and significance of roof cutting is revealed by analysing the stress and displacement of roadside prop. The Universal Distinct Element Code numerical simulation model is established to determine the key roof-cutting parameters (cutting angle and cutting height) according to the on-site situation of No. 2415 headentry of the Suncun coal mine, China. The numerical simulation results show that with the cutting angle and height increase, the vertical stress and horizontal displacement of the coal wall first increase and then decrease, as in the case of the vertical stress and displacement of roadside prop. Therefore, the optimum roof cutting parameters are determined as a cutting angle of 70 • and cutting height of 8 m. Finally, a field application was performed at the No. 2415 headentry of the Suncun coal mine. In situ investigations show that after 10 m lagged the working face, the stress and displacement of roadside prop are obviously reduced with the hanging roof smoothly cut down, and they are stable at 19 MPa and 145 mm at 32 m behind the working face, respectively. This indicates that the stability of the surrounding rock was effectively controlled. This research demonstrates that the key parameters determined through a numerical simulation satisfactorily meet the production requirements and provide a reference for ensuring safe production in deep mining conditions. about 100-500 m, the microstructures, basic mechanical characteristics, and engineering responses of coal and rock have changed significantly in response to the "three highs and one disturbance" environment [10][11][12][13]. The main features are that the surrounding rock has a large deformation, high deformation speed, long deformation duration, and rheological characteristics. Hence, maintenance of the gob-side entry becomes extremely difficult, and large deformation and failure accidents occur occasionally [14][15][16][17][18].Many theoretical studies and field practices on GER technology under deep mining conditions have been completed, and three major advancements should be considered. First, the surrounding rock deformation characteristics and failure evolution law of deep GER are revealed under various geological conditions [19][20][21][22][23]. The roof of the gob-side entry is simplified into a rectangular "superposed stratified plate" structure [24,25], and the concept of the strip segmentation method for the roof load is proposed according to the theory of elastoplastic mechanics. On this basis, used a numerical analysis method to identify the influence mechanism of the roof fracture location, roof rotation, and long-term creep of the surrounding rock in deep ...

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“…are widely performed to measure uniaxial compressive strength, tensile strength, and fracture toughness, respectively [23,24]. Three groups of specimens are prepared.…”

Section: Experimental Methods Uc Bd and Ncsb Loading Testmentioning

confidence: 99%

“…The uniaxial compressive strength (σ uc ), tensile strength (σ t ), and fracture toughness (K IC ) [24] of coal rock samples of different gas pressures are calculated by using equations (1), (2), and 3, respectively.…”

Section: Experimental Methods Uc Bd and Ncsb Loading Testmentioning

confidence: 99%

Crack Initiation Characteristics of Gas-Containing Coal under Gas Pressures

et al. 2019

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In deep coal mines, coal before the working face is subjected to coupled high mining-induced stress and gas pressure. Such condition may facilitate crack formation and propagation in the coal seam, leading to serious coal and gas disasters. In this study, the mechanical properties (i.e., uniaxial compressive strength, tensile strength, and fracture toughness) of gas-containing coal with four levels of initial gas pressure (i.e., 0.0, 0.5, 1.0, and 1.5 MPa) were investigated by uniaxial compression, Brazilian disc, and notched semicircular bending loading test. A newly developed gas-sealing device and an RMT-150 rock mechanics testing machine were used. Fracture modes under different initial gas pressures were also determined. A theoretical method of fracture mechanics was used to analyze crack initiation characteristics under gas adsorption state. Results show that the uniaxial compressive strength, tensile strength, and fracture toughness of gas-containing coal decreased with increasing initial gas pressure. The tensional fracture occurred in gas-containing coal under uniaxial compressive loading with high gas pressure. Cracks in gas-containing coal propagated under small external loads due to the increase in effective stress of crack tip and decrease in cracking strength. This study provided evidence for modifications of the support design of working face in deep coal mines. Furthermore, the correlations between fracture toughness, compressive strength, and tensile strength of gas-containing coal were investigated.

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Energy Storage and Dissipation Evolution Process and Characteristics of Marble in Three Tension-Type Failure Tests

Cited by 83 publications

References 30 publications

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Energy Dissipation Characteristic of Red Sandstone in the Dynamic Brazilian Disc Test with SHPB Setup

Roof Cutting Parameters Design for Gob-Side Entry in Deep Coal Mine: A Case Study

Crack Initiation Characteristics of Gas-Containing Coal under Gas Pressures

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