Effects of deviatoric stress and structural anisotropy on compressive creep behavior of a clayey rock

Liu, Zaobao; Xie, Shouyi; Shao, Jian‐Fu; Conil, Nathalie

doi:10.1016/j.clay.2015.06.039

Cited by 82 publications

(33 citation statements)

References 11 publications

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“…The plastic and crushing zone is 34 r . The condition is met in the crushing zone, i.e., r Aσ σ θ = (15) The area influencing the borehole seal effect is mainly elasto-plastic range. The stress, strain, and size of the displacement in the area are theoretically analyzed as follows.…”

Section: Stress-strain Of Roadway Surrounding Rock Theorymentioning

confidence: 99%

“…In the elastic zone, the rock mass is at the stage of elastic deformation under the action of external force. The majority of the interior crack is located in the initial fissure weak plane, which is under the action of new stress [14,15]. The spatial scale of the fracture weak plane has certain changes, but the rock mass is still in the stage of elastic deformation.…”

Section: Stress-strain Of Roadway Surrounding Rock Theorymentioning

confidence: 99%

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Effect of Stresses and Strains of Roadway Surrounding Rocks on Borehole Airtightness

Wei¹,

Wang²,

An³

2016

JESTR

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At present, many high gas and outburst mines have poor gas drainage effects. An important reason influencing the gas drainage effect is a poor hole-sealing effect. Most studies on gas drainage borehole sealing focus on local and foreign borehole sealing methods, borehole sealing equipment, and borehole sealing materials. Numerical simulations of initial drilling sealing depth are insufficient because studies on this subject are few. However, when the initial sealing depth of the borehole is not chosen reasonably, air can enter the gas drainage drill hole through the circumferential crack of roadway surrounding rocks under the influence of suction pressure of the drainage system. This phenomenon ultimately affects the hole-sealing effect. To improve the drilling hole sealing of gas drainage boring, we deduced the expression formulas of the crushing zone, plastic zone, and elastic zone around the coal-seam floor stone drift and conducted a stress-strain analysis of the coal-seam floor stone drift of the 2145 working surfaces of the Sixth Coal Mine of Hebi Coal Mine Group Company by using theoretical analysis, numerical simulation, and on-scene verification. Finally, we obtain the initial drilling sealing depth, which is a main contribution of this study. The results prove the following. The performed hole-sealing process with an initial drilling sealing depth of 8 m has a gas drainage efficiency of 55%. Compared with the previous 6.8 m initial drilling sealing depth with a gas drainage efficiency of less than 30%, which was adopted by the mine, the initial sealing depth of 8 m chosen in the numerical simulation is reasonable and conforms to the actual situation on the spot. Therefore, the initial drilling sealing depth chosen in the numerical simulation will produce practical and effective guidance to study the field hole-sealing depth.

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Section: Stress-strain Of Roadway Surrounding Rock Theorymentioning

confidence: 99%

Section: Stress-strain Of Roadway Surrounding Rock Theorymentioning

confidence: 99%

Effect of Stresses and Strains of Roadway Surrounding Rocks on Borehole Airtightness

Wei¹,

Wang²,

An³

2016

JESTR

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“…The mechanical properties of coal and rock are of key importance in coal mining and exploration [1][2][3], rock strata control [4][5][6], hydraulic fracturing [7][8][9], rock burst [10,11], (enhanced) coal bed methane recovery (CBM/ECBM) [12], water hazard control [13,14], geo-sequestration [15,16], and underground coal gasification in coal mines and deep unmineable coal seams [17].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Heterogeneous Properties of Coal and Rock Quantified and Mapped at the Microscale

Sun

Zhang

et al. 2020

Applied Sciences

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Due to the impossibility of obtaining intact standard experimental samples, it is difficult to test the mechanical properties of soft and broken coal and rock obtained from deep coal mines. So, an advanced experimental technology based on a small sample volume, nanoindentation technology, was introduced and used to measure the mechanical parameters of them. By using the averaging method, the hardness of shale, mudstone and coal are 1191.90 MPa, 674.95 MPa and 424.30 MPa, respectively; their elastic moduli are 20.39 GPa, 11.72 GPa and 5.47 GPa; and their fracture toughness were 1.66 MPa·m0.5, 1.28 MPa·m0.5 and 0.77 MPa·m0.5. These three mechanical parameters were used to quantify and map the heterogeneous properties of coal and rock for convenience and accuracy. For example, the inter quartile range (IQR) of the hardness of shale, mudstone, and coal are 1502.10 MPa, 1016.20 MPa and 54.64 MPa, respectively, meaning that coal has the best homogeneity among them. Nanoindentation technology provides researchers with a convenient method to conduct mechanical experiments at the microscale.

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“…In early studies, the majority of the creep tests were performed for a period of less than a week, under uniaxial compression and at room temperature [6][7][8]. As the time-dependent behavior of rocks is increasingly considered, numerous experiments have been carried out considering the effects of deviatoric stress [9,10], confining pressure [11][12][13], temperature [5,14], structural anisotropy [15,16], and so on. ese studies mainly focus on the intact rock samples.…”

Section: Introductionmentioning

confidence: 99%

Deformation and Acoustic Emission Characteristics of Cracked Granite during Creep

Wang

Xie

Liu

2020

Advances in Materials Science and Engineering

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A series of multistage creep tests under different confining pressures with acoustic emission monitoring have been performed to investigate the deformation characteristic and failure process of cracked granite during creep. The critical axial strain of cracked sample showed an increasing tendency with the increase of confining pressure. In contrast, critical lateral strain experienced a process of descending first at low confinement and then remaining nearly constant at high confinement. Compared with loading-cracked specimen, smaller critical axial strain, greater critical lateral strain, and higher lateral creep strain rate were found for unloading-cracked specimen. Based on the spatial and temporal distribution of acoustic emission events, the cracking process during creep was analysed. The AE events with high energy are mainly concentrated at the final fracture area of the specimen. The higher the confining pressure, the more the AE events with low energy. Compared with the loading-cracked specimen, the percentage of AE events with high energy is relatively small for the unloading-cracked specimen.

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Effects of deviatoric stress and structural anisotropy on compressive creep behavior of a clayey rock

Cited by 82 publications

References 11 publications

Effect of Stresses and Strains of Roadway Surrounding Rocks on Borehole Airtightness

Effect of Stresses and Strains of Roadway Surrounding Rocks on Borehole Airtightness

Mechanical and Heterogeneous Properties of Coal and Rock Quantified and Mapped at the Microscale

Deformation and Acoustic Emission Characteristics of Cracked Granite during Creep

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