Experimental study on the monitoring of rockburst in tunnels under dry and saturated conditions using AE and infrared monitoring

Liu, Xiangxin; Zhao, Liang; Zhang, Yanbo; Liang, Peng; Tian, Bo

doi:10.1016/j.tust.2018.08.011

Cited by 91 publications

(21 citation statements)

References 32 publications

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“…), and F4 (u ¼ 5.00 MPaÁmin À1 ) As can be seen from Figures 1 to 3, in general, the failure process of salt rock can be divided into four stages and the AE characteristics at each stage are described as follows (Liu et al, 2018b;Zhao et al, 2019):…”

Section: Stress-strain Curves Characteristics and Acoustic Emission (Ae)mentioning

confidence: 99%

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Wang

Zhang

Song

et al. 2021

International Journal of Damage Mechanics

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To study the effect of loading rate on the mechanical properties of salt rock, uniaxial compression tests and acoustic emission tests at different loading rates were carried out on salt rock specimens. The test results show that with increases in loading rate, the peak stress of salt rock increases first and then essentially remains unchanged, and the elastic modulus increases gradually, while the strain at peak stress decreases gradually. Moreover, the Poisson’s ratio is independent of loading rate. The macroscopic failure modes of the salt rock specimens at different loading rates are all ‘X’-type conjugate shear failure. However, the loading rate is closely related to the degree of fracture, such that the smaller the loading rate is, the higher is the degree of fracture of salt rock. In order to describe the stress–strain behaviour in the process of salt rock failure, a damage variable expression represented by the deformation modulus was proposed, and a rock damage constitutive model was established according to the theory of continuum damage mechanics. The rationality of the damage constitutive model was verified by using the present uniaxial compression test results of salt rock and existing test data from the literature. The results show that the model can accurately describe the stress–strain response of rock in the failure process.

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Section: Stress-strain Curves Characteristics and Acoustic Emission (Ae)mentioning

confidence: 99%

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Wang

Zhang

Song

et al. 2021

International Journal of Damage Mechanics

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“…Therefore, effectively obtaining the ruptured sections under these two failure forms is undoubtedly important as a reference to the supporting form selection of surrounding rock and the prediction of rock mass fracture and instability. At present, the observation techniques of rock mechanics tests include computed tomography (CT), magnetic resonance imaging (MRI), and acoustic emission (AE) 35–38 . Although CT and MRI can be used to visualize the propagation path of the cracks, the internal mechanism of the cracks cannot be effectively identified and analyzed, and the test cost is fairly high 37,38 .…”

Section: Introductionmentioning

confidence: 99%

Study on the fracture behavior of prefabricated fissures granite based on DIC and laser scanning techniques

Hao

et al. 2021

Fatigue Fract Eng Mat Struct

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The initiation, propagation, and coalescence of cracks in the rock bridge are the root causes of rock failure. However, the identification of cracks propagation paths is a problem in rock mechanics. This paper studies the evolutionary law of the strain field in the rock bridge region of granite with pre‐fissures using 3D‐DIC after equivalence and simplification. Based on the real crack initiation mechanism of “relative slip between regions” proposed in this paper, combined with the priority order of crack propagation at the edge of the rock bridge, the pattern of cracks propagation and coalescence was obtained. We analyze the fracture characteristics in roughness and morphology to verify the validity of the proposed mechanism. The tensile and shear failure areas around the rock bridge were identified quantitatively, and the roughness, fractal dimension, and energy consumption of the sections formed by tensile failure and shear failure are different.

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“…In summary, studies on the stability of horseshoe-shaped tunnel are rare, and the magnitude and direction of tectonic stress are two important factors affecting the stability of such tunnels. Liu et al [11] studied the rock burst in tunnel under dry and saturated conditions and investigated the influence of water contents on rock burst in tunnel. Water softened rocks and reduced their mechanical properties, and the tunnel model in the saturated state exhibited a lower dynamic failure rate, leading to quicker static failure.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Tectonic Stress on Stability of Horseshoe‐Shaped Tunnels

Wang

Qiu

et al. 2021

Advances in Materials Science and Engineering

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While the tunnel is in the high tectonic stress environment and surrounding rock of tunnel has the characteristics of soft texture and stronger expansion, the preference of tunnel shape is horseshoe. An elastic-plastic model is analyzed by complex function theory in accordance with the deformation characteristics of a horseshoe-shaped tunnel in an engineering site. The numerical model of the tunnel is built by FLAC3D, and the influence of the magnitude and direction of structural stress on the horseshoe-shaped tunnel is studied in detail. Finally, the security support of the tunnel is discussed. Results show that the stress concentration phenomenon is easily focused on the left, right, and bottom sides of the tunnel; these places should therefore be the focus of attention of tunnel stability analysis. The magnitude and direction of tectonic stress greatly affect the stability of the horseshoe-shaped tunnel. Similarly, the magnitude of tectonic stress can significantly affect the deformation state of the tunnel. The direction of tectonic stress mainly reflects the orientation of the tunnel. In addition, the orientation of the tunnel should be arranged along the maximum direction of principal stress.

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Experimental study on the monitoring of rockburst in tunnels under dry and saturated conditions using AE and infrared monitoring

Cited by 91 publications

References 32 publications

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Mechanical properties and damage constitutive model for uniaxial compression of salt rock at different loading rates

Study on the fracture behavior of prefabricated fissures granite based on DIC and laser scanning techniques

Study on the Influence of Tectonic Stress on Stability of Horseshoe‐Shaped Tunnels

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