Dynamic Response and Energy Evolution of Sandstone Under Coupled Static–Dynamic Compression: Insights from Experimental Study into Deep Rock Engineering Applications

Zhou, Zilong; Cai, Xun; Li, Xibing; Cao, Wenzhuo; Du, Xueming

doi:10.1007/s00603-019-01980-9

Cited by 249 publications

(89 citation statements)

References 86 publications

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“…It is well-known that expandable clay minerals (e.g., smectite) cause high swelling stresses after water absorption, further expanding existing microfractures as well as creating new micro-fractures [28,56]. The increase of crack density decreases the rock strength [57,58]. In this study, this effect only acts on the sandstone containing smectite.…”

Section: Chemical and Physical Deteriorationmentioning

confidence: 82%

Water-Weakening Effects on the Mechanical Behavior of Different Rock Types: Phenomena and Mechanisms

et al. 2019

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The presence of water strongly affects rock properties and would be related to a series of geological disasters. To understand water saturation effects on the mechanical behavior of different rock types and interpret the underlying mechanisms of differences in water sensitivity, three kinds of rocks, namely sandstone, granite and marble, were selected for tests. Uniaxial compression experiments were conducted on specimens under oven-dried and water-saturated conditions. Acoustic emission (AE) techniques were also applied to monitor and record AE signals during tests. Experimental results reveal that water weakens the mechanical parameters of the three tested rocks, such as uniaxial compressive strength (UCS), elastic modulus and critical strain. The sandstone undergoes the greatest weakening with the addition of pore water, the mechanical properties of the granite exhibit relatively minor reductions, while the marble is the least affected by water saturation. The water-weakening degree of rock properties depends on the porosity as well as the mineralogy, especially the proportion of quartz and swelling clays. Moreover, after water saturation, the failure pattern of the sandstone and the granite tends to transform into the shear-dominant mode from the tensile one in dry state, probably due to frictional reduction. However, the water presence does not change the failure mode of the marble.

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Section: Chemical and Physical Deteriorationmentioning

confidence: 82%

Water-Weakening Effects on the Mechanical Behavior of Different Rock Types: Phenomena and Mechanisms

et al. 2019

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“…(2) When k s ranges from 0.40 to 0.65, though the specimens still remain stable despite of increasing water saturation coefficient, the strain energy releasing rate began increasing rapidly. In deep coal mining, rockburst accompanying fast energy release commonly happens in such a geo-stress level [41][42][43][44]. From Figure 10, water can release the stored energy within the specimen without triggering instability.…”

Section: Discussionmentioning

confidence: 99%

Water Infusion on the Stability of Coal Specimen under Different Static Stress Conditions

2020

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Underground coal mines are frequently subjected to water infusion, resulting in many mining hazards. This study investigated the effect of water infusion on the stress and energy evolution characteristics of coal specimens representing isolated pillars under different initial axial stress conditions using the discrete element method. A water infusion distribution model was developed, in which random functions were employed to describe water distribution for the purpose of realizing the dispersion of results for a better reliability. Based on the results, a stress-level classification was presented to evaluate the water effect on pillars’ instability. For the investigated coal specimens, the water weakening effect on stress and energy remains stable when the axial geo-stress on pillars is less than 65% of uniaxial compressive strength (UCS). In contrast, when the axial stress coefficient is greater than 65%, pillars become unstable eventually. A higher axial stress coefficient is more likely to introduce a lower critical instability point of the water saturation coefficient for pillars in the process of water infusion. However, the instability point remains random to some extent for specimens following the same water distribution rule under the identical test condition. Two instability types, which also happened randomly, were observed in the numerical results for damaged coal specimens under different water saturation coefficients and axial geo-stresses, namely free-falling and step-falling.

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“…In particular, the underground rock pillar embedded in rock mass after excavation often suffers various cyclic loads caused by earthquake vibrations, mechanical excavation, volcanic action, blasting, drilling, etc. [11][12][13][14][15][16][17], as shown in Figure 1. Hence, it is highly worthwhile to investigate the fatigue damage and failure mechanism of rock materials under cyclic loads for the design and construction of engineering projects.…”

Section: Introductionmentioning

confidence: 95%

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

et al. 2019

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Rock stability has long been a hot topic during underground energy exploitation, but the failure process of rock materials under earthquake effects is extremely complicated, and the failure mechanism still remains unclear. In order to investigate the fatigue damage and failure behavior of rocks under aftershock effects considering the post-mainshock damage states, a series of laboratory tests were conducted on marble specimens subjected to stepwise cyclic loading. Four levels of peak stress (i.e., 10, 30, 50, and 70 MPa) were applied in the first cycle, to simulate mainshock damage.The results indicate that, with the increase of initial cycle amplitude, mainshock damage has a significant effect on deformation behavior, dissipated energy, P-wave velocity, and AE characteristics of tested specimens during aftershock process. The increasing amplitude of initial cycle enhances irreversible deformation and weakens the resistance to deformation, which accelerates the expansion of specimen volume and results in the reduction of bearing capacity. Furthermore, the increasing amplitude of initial cycle obviously changes the failure morphologies and intensifies the final macro-fracture scale of tested specimens, which are verified by acoustic emission AF-RA value and b-value, respectively.

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Dynamic Response and Energy Evolution of Sandstone Under Coupled Static–Dynamic Compression: Insights from Experimental Study into Deep Rock Engineering Applications

Cited by 249 publications

References 86 publications

Water-Weakening Effects on the Mechanical Behavior of Different Rock Types: Phenomena and Mechanisms

Water-Weakening Effects on the Mechanical Behavior of Different Rock Types: Phenomena and Mechanisms

Water Infusion on the Stability of Coal Specimen under Different Static Stress Conditions

Damage Evolution and Failure Behavior of Post-Mainshock Damaged Rocks under Aftershock Effects

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