Mechanical and damage evolution properties of sandstone under triaxial compression

Zong, Yijiang; Han, Lei; Wei, Jingxuan; Wen, Shifeng

doi:10.1016/j.ijmst.2016.05.011

Cited by 66 publications

(27 citation statements)

References 3 publications

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“…Based on the concept of the AE trigger threshold of rock mass, Cai et al [11] proposed a retrieval method of rock strength based on the AE parameters. Zong et al [12] analyzed crack expansion in the damage evolution process of sandstone materials based on the AE activities and established the corresponding damage evolution model. Wasantha et al [13] studied the energy dissipation characteristics of layered sandstones with different dips under the uniaxial compression condition and found that released AE energy decreased with the increase of the bedding dip because small-scale rupture on the microlevel is similar to the largescale rupture on the macrolevel [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Size Effect of Concrete Specimens on the Acoustic Emission Characteristics under Uniaxial Compression Conditions

Wang

Ren

et al. 2017

Advances in Materials Science and Engineering

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Acoustic emission (AE) experiments under uniaxial compression and cyclic loading-unloading compression conditions were performed using different sizes of cubic concrete specimens. The influences of the loading methods and the concrete sizes on the mechanical parameters and the concrete AE activities were analyzed. The loading method was found to have great impact on the deformation, failure, and energy dissipation of concrete materials. With the increase of the material size, the uniaxial compressive strength of the concrete specimens gradually decreased, while the corresponding strain of peak strength increased first and then decreased. The elasticity modulus fluctuated irregularly. Under the uniaxial compression conditions, five AE patterns corresponding to the deformation and failure of the concrete materials were observed. A significant nonlinear relationship was found between the AE and the stress level. The cumulative AE rings at the peak stress showed nonlinear growth with the increase of the concrete size. Based on an established relationship between the cumulative AE rings and the stress level, the necessary conditions for the existence of the quiet AE period were given. Under the uniaxial cyclic loading-unloading compression conditions, the Felicity ratio decreased first and then increased as the stress increased. The research results have some guiding significance to AE-based monitoring of internal stress evolution of coal, rock, and concrete materials and thereby enable assessment of their stability.

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Section: Introductionmentioning

confidence: 99%

Size Effect of Concrete Specimens on the Acoustic Emission Characteristics under Uniaxial Compression Conditions

Wang

Ren

et al. 2017

Advances in Materials Science and Engineering

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“…All of the triaxial compression and creep tests on the sandstone specimens were carried out on a TAW-2000 servo-controlled rock mechanics system with a maximum loading capacity of 2000 kN and confining pressure of 60 MPa [27,28]. During the tests, the axial and radial deformations were measured with axial and radial extensometers with a range of 10 mm and 5 mm, respectively ( Figure 2).…”

Section: Experimental Equipmentmentioning

confidence: 99%

Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone

et al. 2020

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Short-term and creep tests of fractured sandstone with different degrees of damage prepared using pre-peak and post-peak unloading tests on intact sandstone were carried out using a servo-controlled rock mechanics system. Based on our experimental results, the influence of confining pressure and damage on short-term mechanical behavior of fractured sandstone with different degrees of damage was first analyzed. The results show that the peak strength, residual strength, elastic modulus, and secant modulus of fractured sandstone increase linearly with increasing confining pressure, but decrease with increasing damage. The short-term failure modes depend on the damage and change from typical shear failure modes to multiple shear failure modes with increasing damage. Then, the influence of the differential stress, confining pressure, and the degree of damage on the creep mechanical behavior of fractured specimens was further investigated. The axial instantaneous strain and creep strain increase linearly with increasing differential stress, and the specimens exhibit significant time-dependent behavior under high stress. The steady creep rate increases with increasing stress, but it decreases with increasing confining pressure and damage. However, the long-term strength and creep failure strength of fractured specimens increase linearly with increasing confining pressure, but they decrease linearly with increasing damage. The creep failure modes of fractured specimens are also the main shear failure modes, which are similar to the short-term failure modes.

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“…where N is the total AE hits number of the coal-rock combined body when it fails completely, n is the total AE hits number of the coal-rock combined model from the original point to a specific time. Owing to that it, it is hard to judge if a specimen is damaged completely during the failure process, the damage variable needs to be modified, and the modified damage variable can be expressed as [34,35]:…”

Section: Damage Variable Based On Ae Hitsmentioning

confidence: 99%

Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code

et al. 2019

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In this manuscript, the numerical coal-rock combined bodies with different height ratios of rock part to coal-rock combined body (HRRC) were established by particle flow code (PFC) firstly, and then the influence of different HRRC on mechanical properties and numerical acoustic emission (AE) characteristics of coal-rock combined bodies were investigated. Finally, the damage constitutive model of the coal-rock combined body was discussed. The research results show that with the increase of the HRRC, the UCS and the elastic modulus (E) of the combined coal-rock bodies increased. The failure of coal-rock combined bodies is mainly focused on the coal body. The evolution law of AE hits of coal-rock combined bodies have three stages, named stable stage, rapid ascending stage, and rapid descending stage. The damage variable curves of coal-rock combined body have two stages, named slowly damage stage and sharply damage stage. The damage constitutive relation based on AE hits can well reflect the stress-strain relationships with a lower HRRC. However, for a higher HRRC, the damage constitutive equation is not accurately and the damage of the rock part in the coal-rock-combined body should be considered.

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Mechanical and damage evolution properties of sandstone under triaxial compression

Cited by 66 publications

References 3 publications

Size Effect of Concrete Specimens on the Acoustic Emission Characteristics under Uniaxial Compression Conditions

Size Effect of Concrete Specimens on the Acoustic Emission Characteristics under Uniaxial Compression Conditions

Experimental Investigation on the Post-Peak Short-Term and Creep Behavior of Fractured Sandstone

Analysis of Acoustic Emission Characteristics and Damage Constitutive Model of Coal-Rock Combined Body Based on Particle Flow Code

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