Dynamic tensile properties of sandstone subjected to wetting and drying cycles

Zhou, Zilong; Cai, Xun; Ma, Dexin; Chen, Lu; Wang, Shaofeng; Tan, Lihai

doi:10.1016/j.conbuildmat.2018.06.056

Cited by 176 publications

(71 citation statements)

References 64 publications

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“…However, the mine gas disasters—coal and gas outburst, gas explosion, often occur accompanying coal mining . Underground gas drainage has been proved as an effective approach to eliminate gas disaster . The complex geological condition results in the low permeability and large gas content in coal seam .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of flue gas injection enhanced underground coal seam gas drainage

Huo

Jing

Fan

et al. 2019

Energy Science & Engineering

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Coal seam with low permeability is widely distributed in China. Injection of flue gas (N2:CO2 = 0.85:0.15) is an effective approach to improve coal seam gas drainage efficiency. This process relates complex responses among ternary gases (CH4, CO2, and N2) competitive sorption on coals, gas diffusion, gas‐water migration by means of two‐phase flow, and coal deformation. In this paper, an improved hydraulic‐mechanical model coupling above interactions is established for flue gas injection enhanced gas drainage. This model is used to simulate flue gas enhanced drainage by finite element method. The sensitivity analyses of key factors are made to recovery a better understanding on the processes controlling flue gas enhanced drainage. Results show that the flue gas enhanced drainage can indeed improve the efficiency of gas extraction and reduce the gas pressure to the required value in a shorter duration. Due to the competitive adsorption and gas sweeping effect of injected flue gas, CH4 is driven toward drainage borehole, and CH4 pressure and content near the injection borehole decrease faster than that near the drainage borehole. The peak CH4 pressure laterally moves from the injection borehole to the drainage borehole. Higher injection pressure, initial permeability, and smaller sorption affinity ratios may lead to greater CH4 production rate at early drainage stage, but smaller CH4 production rate at late stage. The factors controlling the behavior of flue gas enhanced drainage are initial permeability, injection pressure, and sorption affinity ratios in order. This work offers useful framework to investigate important technical challenges associated with enhanced mine gas drainage, as well as unconventional gas development.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of flue gas injection enhanced underground coal seam gas drainage

Huo

Jing

Fan

et al. 2019

Energy Science & Engineering

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“…Research on the crack initiation, propagation, and coalescence behaviour of rock has great importance for the fundamental knowledge of the fracture mechanism of rock. [1][2][3] In previous studies, rock-like materials, such as gypsum 4 and cement mortar, 5 and real rocks, such as sandstone, 6 granite, 7,8 marble, 9,10 and limestone, 11 are commonly employed as testing objects. Laboratory experiments and numerical simulation are two effective ways to study the crack propagation behaviour of rock.…”

Section: Introductionmentioning

confidence: 99%

Cracking process of a granite specimen that contains multiple pre‐existing holes under uniaxial compression

Huang

Yang

Tian

2019

Fatigue Fract Eng Mat Struct

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The pre‐existence of openings, which play an important role in the mechanical properties and cracking behaviours of rock, is prevalent in rock mass. The interaction among pre‐existing openings (or holes) complicates the instability problems when rock contains multiple holes. Studying the strength failure behaviour of rock that contains multiple pre‐existing holes contributes to the fundamental knowledge of the excavation and stability of underground rock engineering. In this study, first, a series of uniaxial compression tests were performed on granite specimens that contain multiple small holes to investigate the effect of the geometry of pre‐existing holes on the strength and fracture behaviours of rock. The crack initiation, propagation and coalescence process, and acoustic emission (AE) characteristics were investigated using photographic and AE monitoring. Three failure modes were identified, ie, splitting failure, stepped path failure, and planar failure modes. Second, a set of micromechanical parameters in the PFC3D model were calibrated by comparison with the experimental results of an intact granite specimen. The numerically simulated peak strength, peak strain, and failure mode of preholed specimens were consistent with the experimental results. In accordance with the numerical results, the failure modes of the preholed specimens were dependent on the bridge angle and number of holes. Last, the internal fracture characteristics of numerical specimens were revealed by analyzing the horizontal and vertical cross sections at different positions.

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“…Rock materials, as a common construction element due to excellent mechanical properties and convenient in situ collection, have been extensively applied in many underground engineering applications, such as hydropower station, oil gas storage, deep-lying tunnel, and underground goaf [1][2][3][4][5]. During the construction and operation process, due to high in situ stress, weak structural planes, and other uncontrollable geological conditions, many underground rock structures subjected to external disturbance often suffer from rock burst, spalling, high-stress collapse, and larger deformation [6][7][8][9][10]. 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.…”

Section: Introductionmentioning

confidence: 99%

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 tensile properties of sandstone subjected to wetting and drying cycles

Cited by 176 publications

References 64 publications

Numerical investigation of flue gas injection enhanced underground coal seam gas drainage

Numerical investigation of flue gas injection enhanced underground coal seam gas drainage

Cracking process of a granite specimen that contains multiple pre‐existing holes under uniaxial compression

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

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