A creep model for weakly consolidated porous sandstone including volumetric creep

Zheng, Hong; Feng, Xia‐Ting; Hao, Xianjie

doi:10.1016/j.ijrmms.2015.04.021

Cited by 34 publications

(20 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[2][3][4][5][6][7][8][9][10][15][16][17][18][19][20][21][22][23][24][25][26][31][32][33][35][36][37] We have seldom come across the paper that deals with the coupling effect of triaxial stress and gas pressure on the creep deformation of coal. [2][3][4][5][6][7][8][9][10][15][16][17][18][19][20][21][22][23][24][25][26][31][32][33][35]…”

Section: Discussionmentioning

confidence: 99%

“…Previous researches focused on the creep characteristics and constitutive model for rock, soil, and concrete. [2][3][4][5][6][7][8][9][10][15][16][17][18][19][20][21][22][23][24][25][26][31][32][33][35][36][37] We have seldom come across the paper that deals with the coupling effect of triaxial stress and gas pressure on the creep deformation of coal. Investigation on the creep behavior of coal under triaxial compression and gas pressure has a significance in the prevention of coal and gas outburst as well as enhanced coalbed methane recovery.…”

Section: Discussionmentioning

confidence: 99%

“…Substituting Equation (23), (24), and (25) into Equation (21), the 3-D constitutive equations of the nonlinear creep model can be figured out:…”

Section: Three-dimensional Creep Equations For Coal Containing Gasmentioning

confidence: 99%

“…[18][19][20][21] However, because the composite components are linear, the classical constitutive models are not able to describe the three creep stages of rock or coal, especially the accelerating creep phase. The component models are widely studied, popularized, and applied in the investigation of coal and rock creep under uniaxial (or triaxial) compression.…”

mentioning

confidence: 99%

“…Subsequently, the remarkable progress was made with the establishment of representative models, such as the Maxwell model, the Kelvin model, the Bingham model, the Burgers model, and the Nishihara model. [18][19][20][21] However, because the composite components are linear, the classical constitutive models are not able to describe the three creep stages of rock or coal, especially the accelerating creep phase. Therefore, proposing the nonlinear creep model becomes the goal of coal (or rock) creep research.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Creep characteristics and constitutive model of coal under triaxial stress and gas pressure

Zhang

Gao

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

Creep behavior is one of the most important mechanical behaviors of coal. In the present study, we systematically carried out a series of creep experiments of briquette samples under triaxial compression and gas pressure. The experimental results showed that the creep deformation characteristics of coal were related to deviatoric stress and gas pressure. The accelerating creep stage initiated when the deviatoric stress reached or exceeded the yield stress until failure took place. In contrast, when the deviatoric stress was less than the yield strength, only transient and steady creep stage occurred. Besides, gas pressure played a positive role in the creep process of coal. The axial strain of coal slightly increased with gas pressure (range from 0.13 to 0.40 MPa) when the effective triaxial stress remained constant. For example, in the steady creep stage (σ 1 = 9 MPa, p = 0.13 MPa), the axial strain of sample S 1 is 2.710% and that of sample S 2 is 3.361%, that is, coal samples with high gas pressure have higher axial strain. Moreover, gas pressure has two main effects on the mechanical behavior of coal. One is that the coal adsorbs gas molecules resulting in swelling strain and swelling stress, and the other is that the gas pressure may compress the coal particles. Considering the swelling stress and gas pressure, we intensively studied the effective stress formula of coal containing gas. Then, the effective stress was taken into consideration in the nonlinear Nishihara creep model. Furthermore, the tertiary creep factor n was introduced in the nonlinear model to control the creep deformation evolution with time so that the nonlinear model could accurately describe the full creep stage of coal. In contrast, due to the lack of such a controlling parameter, the Nishihara model failed to reproduce the accelerating creep stage. K E Y W O R D Scoal, creep model, effective stress, gas pressure, swelling stress, triaxial compression | INTRODUCTIONCreep behavior is one of the fundamental mechanical properties of coal or rock, associated with the stability of many buildings and underground structures in mining and rock engineering, such as roadways, tunnels, and dams. It is important to have a precise understanding of the creep or timedependent behavior of coal or rock, which may prevent coal 502 | ZHANG et Al. Highlights• The coupling effect of triaxial stress and gas pressure on coal was investigated. • The gas pressure played a positive role in the creep process of coal. • The effective stress of gas-filled coal was intensively studied. • The effective stress was considered in the nonlinear Nishihara creep model of coal, which could accurately reproduce the three creep stages, especially the accelerating creep stage.How to cite this article: Zhang L, Li X-C, Gao J-X, An Z-X, Yang X-H, Nie B-S. Creep characteristics and constitutive model of coal under triaxial stress and gas pressure. Energy Sci Eng. 2020;8:501-514. https ://doi.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Substituting Equation (23), (24), and (25) into Equation (21), the 3-D constitutive equations of the nonlinear creep model can be figured out:…”

Section: Three-dimensional Creep Equations For Coal Containing Gasmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Creep characteristics and constitutive model of coal under triaxial stress and gas pressure

Zhang

Gao

et al. 2019

Energy Science & Engineering

View full text Add to dashboard Cite

show abstract

Anisotropy Characteristics of Stress Relaxation in Coal: An Improved Fractional Derivative Constitutive Model

et al. 2018

View full text Add to dashboard Cite

Evaluating the Microstructure Evolution Behaviors of Saturated Sandstone Using NMR Testing Under Uniaxial Short-Term and Creep Compression

et al. 2021

View full text Add to dashboard Cite

A creep model for weakly consolidated porous sandstone including volumetric creep

Cited by 34 publications

References 21 publications

Creep characteristics and constitutive model of coal under triaxial stress and gas pressure

Creep characteristics and constitutive model of coal under triaxial stress and gas pressure

Anisotropy Characteristics of Stress Relaxation in Coal: An Improved Fractional Derivative Constitutive Model

Evaluating the Microstructure Evolution Behaviors of Saturated Sandstone Using NMR Testing Under Uniaxial Short-Term and Creep Compression

Contact Info

Product

Resources

About