Mechanical and failure properties of rocks with a cavity under coupled static and dynamic loads

Li, Diyuan; Xiao, Peng; Han, Zhenyu; Zhu, Quanqi

doi:10.1016/j.engfracmech.2018.10.021

Cited by 71 publications

(23 citation statements)

References 13 publications

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“…Rectangular cuboid granite specimens were tested by using a modified split Hopkinson pressure bar (SHPB) system with coupled static and dynamic loads, as shown in Figure 1. e modified SHPB system consists of a gas gun, a cone-shaped striker, an incident bar, a transmitted bar, a momentum bar, a damper, and a set of axial static pressure device [44].…”

Section: Loading Systemmentioning

confidence: 99%

Full- and Local-Field Strain Evolution and Fracture Behavior of Precracked Granite under Coupled Static and Dynamic Loads

Gao

Han

et al. 2020

Shock and Vibration

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Flaws and discontinuities play a crucial role in the failure process of rocks. To investigate the fracturing mechanism of rock with combined flaws composed of crack and hole, the digital image correlation (DIC) method is used to record and analyze the rock failure behavior. Coupled static and dynamic loads are applied on granite specimens with prefabricated flaws by a modified split Hopkinson pressure bar (SHPB) device. The dynamic mechanical properties of the granite specimens are affected by the flaw inclinations with the loading directions. With the inclination angle increasing, the combined strength and peak strain both decrease first and then increase. Full- and local-field strain evolution of the granite specimens is analyzed in a quantitative way by using DIC technique. The specimens with a flaw angle of 45° are broken relatively evenly with homogenous small particle sizes. The variation trend of fragment sizes is consistent with that of combined strength and absorption energy of the specimens.

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Section: Loading Systemmentioning

confidence: 99%

Full- and Local-Field Strain Evolution and Fracture Behavior of Precracked Granite under Coupled Static and Dynamic Loads

Gao

Han

et al. 2020

Shock and Vibration

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“…In response to deep mines disasters, scholars have carried out a lot of work from the aspects of mechanism research, surrounding rock support, and disaster prediction. The mechanism research includes in-situ stress measurement [2][3][4], surrounding rock quality classification [5][6][7], rock mechanics test [8][9][10][11], various failure criteria [12][13][14], et al The surrounding rock support includes the use of new-type bolts [15][16][17][18], filling of goaf [19][20][21][22], and combination of multiple support methods [23][24][25], and so on. Disaster prediction includes microseismic monitoring [26][27][28], various rockburst prediction models [29][30][31], et al…”

Section: Introductionmentioning

confidence: 99%

Field investigation and analysis of rockburst and spalling in a deep hard-rock mine

Xiao¹,

Guo-yan²,

Liu³

2021

Preprint

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In order to investigate the ground pressure disasters in deep hard-rock mines, field investigation and theoretical analysis were carried out in a deep hard-rock mine. It is found that the degree and number of ground pressure disasters in the mine have increased significantly with depth. When the maximum tangential stress between 0.4-0.6 times the uniaxial compressive strength of surrounding rock, surrounding rock is prone to local spalling. When maximum tangential stress is greater than 0.6 times uniaxial compressive strength, serious failure is easy to occur, such as rockbursts and large-area collapses. After excavation, the rebound strain and displacement of surrounding rock increases linearly with buried depth, and the strain energy released of surrounding rock increases rapidly with the second power of buried depth. The rapidly increasing strain energy is main reason why deep ground pressure disasters in the mine are becoming more and more serious. In terms of surrounding rock support, energy-absorbing materials such as energy-absorbing bolts can well absorb strain energy released by surrounding rock. The energy-absorbing bolts are used for design of roadway support in the mine.

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“…e antibreaking measures (such as structural strengthening or surrounding rock strengthening) can effectively resist many adverse influences induced by the stick-slip fault. e reducing dislocation measures can reduce the transmission of shear force and forced displacement [9,10]. Some former research results have shown that the active joints in the secondary lining of tunnel structures can effectively reduce longitudinal dislocation, while the damping layers between the primary supports and the secondary linings can reduce lateral dislocation [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

Cui

Wang

et al. 2020

Advances in Materials Science and Engineering

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In order to improve the structural safety and stability of the tunnels crossing stick-slip fault, an indoor model test on the effect of tunnel antibreaking measures under the influence of fault stick-slip movements was conducted. Using contact pressure, longitudinal strain, and safety factor, the antibreaking effect of tunnels was compared and analyzed under 5 kinds of operating conditions, mainly including no measures, structural strengthening, structural strengthening and reducing dislocation layer, structural strengthening and reducing dislocation joint, structural strengthening and reducing dislocation layer, and reducing dislocation joint. The results showed that the longitudinal strain and contact pressure of the tunnel changed markedly (from severe change to more uniform change) when the reducing dislocation measures were adopted in the test, reducing dislocation layer/joint or reducing dislocation layer and reducing dislocation joint. The effect of reducing the fault stick-slip dislocation on the tunnel structure is very limited by only taking structure strengthening measures. The effect of reducing the fault stick-slip dislocation on the tunnel structure is obvious by using the reducing dislocation method, and the minimum safety factor is increased by more than 8 times. The effect of resisting and reducing the fault stick-slip dislocation on the tunnel structure is remarkable by adopting the measures of the structural strengthening and reducing dislocation layer and reducing dislocation joint, and the minimum safety factor is increased by more than 25.45 times. The results can provide reference for the design of antibreaking for the stick-slip fault tunnel in high earthquake intensity and dangerous mountainous areas.

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Mechanical and failure properties of rocks with a cavity under coupled static and dynamic loads

Cited by 71 publications

References 13 publications

Full- and Local-Field Strain Evolution and Fracture Behavior of Precracked Granite under Coupled Static and Dynamic Loads

Full- and Local-Field Strain Evolution and Fracture Behavior of Precracked Granite under Coupled Static and Dynamic Loads

Field investigation and analysis of rockburst and spalling in a deep hard-rock mine

Model Tests on the Antibreaking Countermeasures for Tunnel Lining Across Stick‐Slip Faults

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