Dynamic Mechanical and Fracture Behaviour of Sandstone Under Multiaxial Loads Using a Triaxial Hopkinson Bar

Liu, Kai; Zhang, Qianbing; Wu, G.; Li, J. C.; Zhao, Jian

doi:10.1007/s00603-018-1691-y

Cited by 122 publications

(27 citation statements)

References 76 publications

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“…The mechanical properties of in situ rocks are likely influenced by the in situ stress together with the disturbed stress induced by the drilling, blasting, rockburst and earthquake (Li et al 2010b;Liu et al 2019). To investigate the dynamic behavior of rock at varied depth after dynamic disturbances, laboratory tests using the SHPB were performed.…”

Section: Dynamic Behavior Of Disturbed Rock At Varied Depth and Straimentioning

confidence: 99%

“…Yuan et al (2011) carried out impact tests on Westerly granite under confined loading conditions, and reported that a strain rate over 300 s -1 is necessary to convert the Westerly granite from sparse fracture to pervasive pulverization under dynamic impact. Recently, Liu et al (2019) developed a triaxial Hopkinson bar where multiaxial static confinement and one-direction impact could be realized. A preliminary test showed that the strength of sandstone decreases with the increase of the maximum principle stress along the impact direction, while it increases with increasing lateral intermediate and minimum principal stress.…”

Section: Introductionmentioning

confidence: 99%

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Conceptualization and preliminary study of engineering disturbed rock dynamics

Xie

Zhu

Zhou

et al. 2020

Geomech. Geophys. Geo-energ. Geo-resour.

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Many large engineering projects, e.g., the Sichuan–Tibet Railway, inevitably cross the earthquake active areas and the geology complicated zones, facing the challenges of dynamic disturbances and disasters. In view of this, the conceptualization of engineering disturbed rock dynamics is proposed in this paper, aiming to systematically study the rock dynamic behavior and response subjected to engineering disturbances, to establish the 3D rock dynamic theory, and to develop the disaster prevention and control technical measures. The classification standards of rock loading states based on strain rate are summarized and analyzed. The engineering disturbed rock dynamics is defined as the theoretical and applied science of rock dynamic behaviors, dynamic responses and their superposition caused by dynamic disturbances during engineering construction and operation periods. To achieve the goals of the proposed engineering disturbed rock dynamics, a combined methodology of theoretical analysis, laboratory experiment, numerical simulation and in situ tests is put forward. The associated research scopes are introduced, i.e., experimental and theoretical study of engineering disturbed rock dynamics, wave propagation, attenuation and superposition in rock masses, rock dynamic response of different loading conditions, dynamic response of engineering projects under construction disturbance and disaster mitigation techniques, and dynamic response of major engineering projects under operation disturbance and safety guarantee measures. Some theoretical, experimental and field preliminary studies were performed, including dynamic behavior of disturbed rock at varied depth and strain rates, dynamic response of rock mass subjected to blasting excavation disturbance and dynamic drilling disturbance, and disturbance of rock mass subjected to TBM excavation. Preliminary results showed that the rock masses are significantly disturbed by dynamic disturbances during construction and operation periods of engineering projects. The innovative conceptualization of engineering disturbed rock dynamics and the expected associated outcomes could facilitate establishing the 3D rock dynamic theory and offering theoretical fundamentals and technical guarantees for safety and reliability of the design, construction and operation of modern large engineering.

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Section: Dynamic Behavior Of Disturbed Rock At Varied Depth and Straimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conceptualization and preliminary study of engineering disturbed rock dynamics

Xie

Zhu

Zhou

et al. 2020

Geomech. Geophys. Geo-energ. Geo-resour.

View full text Add to dashboard Cite

show abstract

“…Zhang and Zhao [7] summarized the research of rock dynamic mechanics in detail and reported that the high prestatic rocks are often affected by dynamic disturbances during, before, and after the exaction process. Liu et al [8] pointed out in detail that the high prestressed rock is in the coupled static-dynamic stress state during deep rock engineering excavation. Ernesto et al [9] analyzed the deep high prestatic rock failure under deep engineering excavation and estimated the probability of static and dynamic demand for rock mass stable in underground excavation.…”

Section: Introductionmentioning

confidence: 99%

Strength Weakening Effect of High Prestatically Loaded Marble Subjected to Low‐Frequency Dynamic Disturbance under Point Load

Gong

2021

Shock and Vibration

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The deep high prestatically loaded rock is often subjected to low-frequency dynamic disturbance and exhibits unusual strength characteristics, and thus, it is important to investigate the strength characteristics under the coupling effect of prestatic load and low-frequency dynamic disturbance loading conditions. In this study, a series of point load tests were conducted on the high prestatically loaded marble subjected to low-frequency disturbance by the MTS system, focusing on exploring the role of prestatic load level and low-frequency disturbance frequency in the process of rock strength change. Based on the average static failure load (Fmax) of samples under the static point loading, the high prestatic load levels (Fp) were selected as 70%, 80%, and 90% of Fmax, the corresponding low-frequency dynamic disturbance was loaded by sinusoidal waves with amplitudes of 60%, 40%, and 20% of Fmax, and the low-frequency dynamic disturbance frequencies (f) are 1, 2, 5, and 10 Hz. The change curve of the point load strength with the prestatic load level or the disturbance frequency was analyzed, which indicates that the point load strength under the coupled high prestatic load and low-frequency dynamic disturbance load was significantly lower than that under the pure static loading, presenting a significant point load strength weakening effect. Only when Fp or f reaches a certain level, the point load strength decreases significantly as f or Fp increases. Moreover, the point load strength weakening rate was proposed to characterize the degree of strength weakening. The comprehensive analysis demonstrates that Fp has a greater effect on the point load strength weakening effect than f, which is mainly reflected in the point load strength weakening level dominated by the Fp, and the weakening degree is affected by f.

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“…Many previous studies have shown that the failure mode of coal is characterized by the development of internal fractures under loading and ultimately leading to macroscopic damage [14][15][16]. For the static loading method, the uniaxial compression test is mainly used to study the static mechanical properties [17]. e dynamic loading of the explosion will affect the stability of the surrounding rock.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Mechanical Response of Coals to Uniaxial Compression and Low‐Speed Dynamic Loading

Zhu

Ren

et al. 2021

Shock and Vibration

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The surrounding rock of roadways in underground coal mines will lose its stability or even collapse under gas explosions, especially roadways surrounded by coals. The dynamic mechanical properties of coals were tested in order to investigate the dynamic response of coals under gas explosions. The static mechanical properties of coals were also tested as comparison. It is found that the dynamic stress-strain curves showed no obvious pore compaction stage comparing with uniaxial loading. The dynamic compression strength and the elastic modulus are obviously larger than those obtained in the static mechanical properties test, and the dynamic strain shows an obvious hysteresis phenomenon. The ultimate strain and absorbed energy increased linearly with increase of the strain rate. With the increase of dynamic loading, the fragment size of coal cores decreased obviously. The results could provide a reference for the antiexplosion design of the coal roadway.

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Dynamic Mechanical and Fracture Behaviour of Sandstone Under Multiaxial Loads Using a Triaxial Hopkinson Bar

Cited by 122 publications

References 76 publications

Conceptualization and preliminary study of engineering disturbed rock dynamics

Conceptualization and preliminary study of engineering disturbed rock dynamics

Strength Weakening Effect of High Prestatically Loaded Marble Subjected to Low‐Frequency Dynamic Disturbance under Point Load

Experimental Investigation on the Mechanical Response of Coals to Uniaxial Compression and Low‐Speed Dynamic Loading

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