Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks: Deterioration and micro-mechanism

Wang, Peng; Xu, Jinyu; Fang, Xikui; Wen, Ming; Zheng, Guanghui; Wang, Peixi

doi:10.1016/j.enggeo.2017.04.012

Cited by 46 publications

(18 citation statements)

References 26 publications

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“…where F max is the maximum impact load, d is the diameter of the Brazilian disc, and h is the height of the Brazilian disc. By substituting formula (11) into formula (12), the maximum tensile strain that point A bears is calculated by…”

Section: Plos Onementioning

confidence: 99%

“…Researchers have performed many studies on the unique mechanical conditions that rocks experience during the production of geothermal energy. It was found that the dynamic tensile failure strain of rocks increased with increasing temperature [ 10 , 11 ], and the dynamic tensile strength first increased and then decreased by using Brazilian discs to perform dynamic splitting tests of high-temperature rocks [ 12 , 13 ]. Some researchers also carried out studies on the rock surrounding wellbores under a high static load, and it was found that the dynamic tensile strength of the rock under a high static load was far greater than the tensile strength under a static load, and the failure characteristics of tensile strength mentioned above were generally consistent [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

et al. 2020

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Based on the engineering background in which the rock surrounding a wellbore is affected by a thermal shock, impact disturbances from drilling vibration, cyclic heat extraction and high temperature during hydrothermal geothermal energy mining, the environmental conditions in the shaft wall rock are simulated by means of high temperature, cooling, immersing granite in water with different curing temperatures and applying impact loads. Additionally, an experimental study on the mechanical characteristics of circular granite specimens under radial impact loads and in the heat treatment and water curing conditions is carried out. The results show that the inner diameters of the rings, heating temperatures, curing water temperatures and cycle heating times are less affected than other parameters by the impact load-strain curves of circular granite, which can generally be divided into three sections, i.e., the initial straight stage, nonlinear ascent yield stage and post-peak nonlinear decline stage. The factors in the test weaken the capacity of the circular granite to resist the impact, but the sizes of the inner diameters of the rings play a leading role. Dynamic tensile strain is generated in the inner wall along the impact direction during the impact, while compressive strain is produced on the inner wall in the vertical impact loading direction. By analysing the crack propagation and final failure mode of circular granite, it is found that dynamic tensile failures are generated, crack initiation starts from the inner wall along the impact loading direction, and the outer circle in the vertical direction lags behind. The crack starts early and develops quickly on one side of the transmission bar. Finally, the failure criterion is established on the basis of some assumptions and circular-granite deformation failure characteristics, and the parameters, measured by the Brazilian disk test, are reasonably verified via substitution into the failure criterion equation.

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Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

et al. 2020

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“…For instance, to investigate the decay e ect of rock against cyclic heating-cooling and freezing-thawing, a decay function model, consisting of decay constant (λ) and number of cycles (N), was proposed by Mutlutürk et al [33], and the model was con rmed to satisfy the experimental data well. On the basis of this decay model, considering the strain rate, an improved deterioration model was proposed by Wang et al [37,38] for the prediction of dynamic mechanical degradation of rocks exposed to longterm weathering. According to loading rate and number of wet-dry cycles, the decay function model of red-sandstone against wet-dry cycles is presented as follows:…”

Section: Dynamical Compression Strength Of Red-sandstone After Differmentioning

confidence: 99%

Dynamic Compression Properties and Deterioration of Red‐Sandstone Subject to Cyclic Wet‐Dry Treatment

Bai

2019

Advances in Civil Engineering

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Rock engineering is usually associated with impact loads induced by blasting, drilling, vibration, or earthquake. In the engineering fields of tunnelling, slopes, dams, and mining, rocks are always subjected to cyclic wet-dry caused by periodical variation in moisture. To study cyclic wet-dry effects on dynamic compression properties and deterioration of red-sandstone, physical tests and dynamic and static tests were conducted after 0, 5, 10, 15, and 20 wet-dry cycles. Changes in physical and mechanical parameters, including P-wave velocity, density, and static and dynamic compression strength, were determined. Deterioration of red-sandstone caused by wet-dry cycles was verified through physicomechanical parameters, and the microscopic features were scanned by SEM techniques. Experimental results showed that the dynamic compression strength increased with the loading rate, but decreased with the increase of wet-dry cycles. In terms of the loading rate, the decay function model was proposed to evaluate the long-term dynamic compression strength of red-sandstone against cyclic wet-dry action. Besides, the function of the loading rate was obtained. Parameters of two models, decay constant and half-life values, were measured accurately.

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“…Over the past few years, the dynamic tensile test has mainly been used to study isotropic rock, such as red sandstone [25] and granite [26]. e research shows that, under the SHPB dynamic tensile test, the disc of the sample is always split along the centre of the disc into two halves, and the tensile strength and elastic modulus of the rock increase with increasing loading rate.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Splitting Tensile Properties and Failure Mechanism of Layered Slate

Liu

Wang

et al. 2020

Advances in Civil Engineering

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Dynamic tensile failure is one of the main failure modes of layered rock masses during the excavation of underground engineering. This study investigates the influence of loading rate and layered inclination angle on the mechanical properties and failure mechanisms of layered slate using a split-Hopkinson pressure bar system and high-speed cameras. The results show that, overall, the dynamic elastic modulus E, postpeak stress reduction rate K, and failure load of the discs with the 7 tested bedding angles increase with the increasing loading rate. A nonlinear formula is proposed to describe the relationship between loading rate and failure load for the 7 tested inclination angles. As the inclination angle of the bedding planes increases from 0° to 90°, both the static and dynamic failure loads of the slate increased. However, with increasing loading rate, the anisotropic influence coefficient N ranges from 3.25 under the static load to 1.35 under the dynamic load, and the bedding effect gradually decreases. From the dynamic Brazilian splitting tests, the failure of the discs is mainly observed along the bedding planes when the inclination angle is less than or equal to 45°. Failure of the discs mainly occurs along the centre of the disc and previously intact planes when the inclination angle is greater than 60°. This study provides significant data to evaluate the mechanical properties and failure mechanisms of layered rock and the safety and stability of layered rock under dynamic loading.

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Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks: Deterioration and micro-mechanism

Cited by 46 publications

References 26 publications

Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

Study on the dynamic characteristics of rock surrounding a wellbore in energy storage areas during deep geothermal energy mining

Dynamic Compression Properties and Deterioration of Red‐Sandstone Subject to Cyclic Wet‐Dry Treatment

Dynamic Splitting Tensile Properties and Failure Mechanism of Layered Slate

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