Experimental investigation of the strain rate effect on crack initiation and crack damage thresholds of hard rock under quasi-static compression

Xu, Rongchao; Zhang, Shengzhe; Li, Zhen; Yan, Xingxu

doi:10.1007/s11440-022-01631-4

Cited by 36 publications

(6 citation statements)

References 90 publications

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“…The response pattern of the rock mass to the loading provides insights into the movement of faults. The mechanical test results indicate that during quasi-hydrostatic loading of granite and sandstone, the volume expansion of granite and sandstone becomes more obvious as the strain rate increases [81], showing a positive correlation between the strain rate and rock damage [82]. The XSHF is located in an area comprising granite and sandstone lithologies, and the numerical inversion results reveal that the SW wall experiences a high strain rate environment, whereas the strain rate decreases rapidly from west to east on the NE wall [43,83].…”

Section: Width Of the Fault Damage Zonesmentioning

confidence: 99%

Spatial Variations of Deformation along a Strike-Slip Fault: A Case Study of Xianshuihe Fault Zone, Southwest China

Li,

Guo,

et al. 2024

Applied Sciences

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The distribution of damage zones around a fault has long been regarded as a frontier and hot spot in the field of geoscience but is still not fully understood. In this study, we conducted field investigations and tests around the Xianshuihe fault zone (XSHF), a left-lateral strike-slip fault with a length of about 400 km located in the eastern margin of the Tibetan Plateau. The results reveal that the fracture frequency and rock strength parameters present a spatially asymmetric distribution along the fault and have a negative power-law correlation with the distance from the fault. The widths of the damage zones are approximately 20.8 km and 17.1 km in the southwest and northeast directions, respectively. Combined with the previous studies, we presented a negative power-law function to depict the correlation between slip displacement and the width of the damage zone and found that the growth rate of damage zone in faults with low displacement is greater than that in those with large displacement. The study demonstrates that the asymmetric distribution of the damage zone surrounding the XSHF is mainly due to the stress redistribution in different damage zones stemming from the left echelon and different activity rates of the blocks on both sides of the XSHF.

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Section: Width Of the Fault Damage Zonesmentioning

confidence: 99%

Spatial Variations of Deformation along a Strike-Slip Fault: A Case Study of Xianshuihe Fault Zone, Southwest China

Li,

Guo,

et al. 2024

Applied Sciences

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“…Relevant scholars have carried out a series of researches on the water inrush problem of underground engineering and achieved effective results. Rongchao Xu et al 7 studied the influence of strain rate effect on crack stress threshold and revealed the mechanical mechanism of hard rock showing different strength and deformation characteristics at different strain rates. Haiyan Li 8 developed a visual grouting simulation test system to solve the problem of water gush grouting and plugging in karst pipelines, which realized the real-time observation and image acquisition of slurry diffusion and deposition morphology in the process of dynamic water grouting, and studied the pipe plugging law of cement-sodium silicate quick-setting materials under static and dynamic water conditions.…”

Section: Introductionmentioning

confidence: 99%

Migration mechanism of grouting slurry and permeability reduction in mining fractured rock mass

Zhengzheng,

Pengshuai,

Zhenhua

et al. 2024

Sci Rep

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In order to solve the water and gas discharge hazard caused by gob water and harmful gases (such as CO), the method of grouting overburden fractures is adopted to achieve the purpose of safe and efficient mining production in coal mines. This paper carries out the experimental research on the permeability reduction effect of grouting in fractured rock mass, expounds the relationship between gas flow rate and pressure gradient, seepage pressure and permeability, confining pressure and permeability, and analyzes the permeability change law of fractured rock mass before and after grouting. Besides, the grouting migration and permeability reduction model of fractured fine-grained sandstone is constructed by combining grouting test and numerical simulation, which reveals the dynamic evolution law of rock mass permeability in the grouting process. The results show that the permeability of the grouting rock sample decreases from 700–13,000 to 15–300 mD than that of the ungrouting rock sample, and the decrease is more than 95%, which indicates that the sealing performance of grouting slurry is better. Besides, numerical simulations show that the initial permeability of rock samples is 971.9 mD, and the permeability decreases to 45.79 mD after 1800s, and the permeability decreases to 95.3%, which is basically consistent with the experimental results after grouting. The greater the grouting pressure is, the better the grouting effect is. With the increase of the grouting pressure, the increase of the grouting effect is no longer obvious.

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“…[1][2][3][4][5][6][7][8] Studying the cracking behaviour of the fractured rock has a practical significance for analyzing the stability of rock mass engineering. [9][10][11][12][13][14][15][16] Fractured rock has been studied extensively by many researchers. The failure behaviour of rocks containing single flaw has first attracted the attention of researchers.…”

Section: Introductionmentioning

confidence: 99%

“…The flaws affect the mechanical properties, deformation characteristics and failure behaviour of the rock 1–8 . Studying the cracking behaviour of the fractured rock has a practical significance for analyzing the stability of rock mass engineering 9–16 …”

Section: Introductionmentioning

confidence: 99%

Numerical investigation on the influence of secondary flaw lengths on the mechanical characteristics and cracking behaviour of red sandstone containing orthogonal cross flaws

Xu,

Dou,

Zhao

et al. 2024

Num Anal Meth Geomechanics

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Flaw length has a significant effect on the cracking behaviour of fractured rock. PFC2D was used to simulate the uniaxial compression of red sandstone samples with secondary flaw lengths L2 of 0 mm, 5 mm, 10 mm, 15 and 20 mm under different primary flaw angles α(α = 0°, 15°, 30°, 45°, 60°, 75°, and 90°). Based on the simulation results, the effects of the secondary flaw length on the mechanical parameters, crack initiation location and crack evolution process of the fractured rock were analysed. Then, a method for judging the initiation location of the first cracks was proposed. Finally, the characteristics of the particle displacement field at preexisting flaw tips during first and secondary crack initiation were analysed. The results of this study are helpful for more deeply understanding the cracking behaviour of fractured rock.

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Experimental investigation of the strain rate effect on crack initiation and crack damage thresholds of hard rock under quasi-static compression

Cited by 36 publications

References 90 publications

Spatial Variations of Deformation along a Strike-Slip Fault: A Case Study of Xianshuihe Fault Zone, Southwest China

Spatial Variations of Deformation along a Strike-Slip Fault: A Case Study of Xianshuihe Fault Zone, Southwest China

Migration mechanism of grouting slurry and permeability reduction in mining fractured rock mass

Numerical investigation on the influence of secondary flaw lengths on the mechanical characteristics and cracking behaviour of red sandstone containing orthogonal cross flaws

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