Effects of loading rate on strength and deformability of Maha Sarakham salt

Fuenkajorn, Kittitep; Sriapai, Tanapol; Samsri, Pichit

doi:10.1016/j.enggeo.2012.02.012

Cited by 57 publications

(18 citation statements)

References 13 publications

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“…Isotach viscosity in the pre-peak regions was also observed for undisturbed specimens of silt-sandstone and mudstone (of Kazusa formation, Japan) during consolidated triaxial creep tests [4]. Substantial increase in peak strength and elastic modulus due to viscous effects has been found for Maha Srakham Salt (of Maha Sarakham formation, Thailand), tested under unconfined and confined monotonic loading conditions [5]. Similar effects of viscosity have also been reported for Limestone (of Solnhofen Limestone formation, Germany) [6].…”

Section: Introductionmentioning

confidence: 93%

Effects of loading rate on strength and deformation characteristics of gypsum mixed sand

2019

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It has been unanimously acknowledged that the strength and deformation characteristics of bounded geomaterials, viz. cemented soils and natural rocks, are predominantly governed by the rate of loading/deformation. Rational evaluation of these time-dependent characteristics due to viscosity and ageing are vital for the reliable constitutive modelling. In order to study the effects of ageing and loading/strain rate (viscosity) on the behaviour of bounded geomaterials, a number of unconfined monotonic loading tests were performed on Gypsum Mixed Sand (GMS) specimens at a wide range of axial strain rates; ranging from 1.9E-05 to 5.3E+00 %/min (27,000 folds), and at different curing periods. The results indicate shifts in the viscous behaviour of GMS at critical strain rates of 2.0E-03 and 5.0E-01 %/min. In the light of this finding, the results are categorized into three discrete zones of strain rates, and the behaviour of GMS in each of these zones is discussed. A significant dependency of peak strength and stress-strain responses on strain rate was witnessed for specimens subjected to strain rates lesser than 2.0E-03 %/min, and the effects of viscosity/strain rate was found to be insignificant at strain rate higher than 5.0E-01%/min.

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Section: Introductionmentioning

confidence: 93%

Effects of loading rate on strength and deformation characteristics of gypsum mixed sand

2019

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“…These failure characteristics may be related to the time-dependent initiation and propagation of micro-cracks in rocks. 3,[65][66][67] At the strain rate increases, the dynamic strength increases, and therefore, a higher level of stress is reached before micro-cracks coalescence occurs, causing the specimen to fail. Consequently, a greater number of micro-cracks are generated in the specimen fracturing process.…”

Section: The Fragmentation Characteristicsmentioning

confidence: 99%

“…Published investigations revealed that the mechanical properties of rocks are markedly influenced by the strain rate imposed on them, which can be regarded as the dynamic behaviours. These mechanical properties include properties such as strength, elastic modulus, and fracture toughness .…”

Section: Introductionmentioning

confidence: 99%

A particle mechanics approach for the dynamic strength model of the jointed rock mass considering the joint orientation

Zhou

Karakus

et al. 2019

Num Anal Meth Geomechanics

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Summary In nature, there exist several forms of anisotropy in rock masses due to the presence of bedding planes, joints, and weak layers. It is well understood that the anisotropic properties of jointed rock masses significantly affect the stability of surface and underground excavations. However, these critical anisotropic characteristics are often ignored in existing uniaxial dynamic failure criteria. This study investigates the effect of a pre‐existing persistent joint on the rate‐dependent mechanical behaviours of a rock mass using a particle mechanics approach, namely, bonded particle model (BPM), to realistically replicate the mechanical response of the rock mass. Firstly, in order to capture the rate‐dependent response of the jointed rock mass, the BPM model is validated using published experimental data. Then, a dynamic strength model is proposed based on the Jaeger criterion and simulation results. To further investigate the dynamic behaviours, the dynamic uniaxial compressive strength (UCS) for anisotropic rock masses with various joint orientations is investigated by subjecting the BPM models to uniaxial compression numerical tests with various strain rate. The proposed dynamic strength model is validated based on numerical simulation results. Finally, the fragmentation characteristics of the jointed rock masses are analysed, which demonstrate that the failure mode affects the dynamic UCS. This is further confirmed by the analysis of the orientations of microscopic cracks generated by the compression loading.

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“…Elevated temperatures significantly increase the creep rate [11][12][13][14] and decrease the compressive strengths [15] of the salt. Numerous constitutive equations have been proposed to describe the time-dependent deformation and strength of salt under confinements and at elevated temperatures [1][2][3][4][5][6]10,11,13,15]. Study on the effect of temperature on the salt tensile strength and tensile creep deformation has however never been attempted.…”

Section: Introductionmentioning

confidence: 99%

“…For the past few decades the mechanical behavior of rock salt has been largely concentrated on the time-dependent deformation under compression [1][2][3][4][5]. It is agreed that salt compressive strength increases with increasing applied loading rate and strain rate [6][7][8][9][10]. Elevated temperatures significantly increase the creep rate [11][12][13][14] and decrease the compressive strengths [15] of the salt.…”

Section: Introductionmentioning

confidence: 99%

Effects of loading rate and temperature on tensile strength and deformation of rock salt

Sopon

Walsri

Fuenkajorn

2015

International Journal of Rock Mechanics and Mining Sciences

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Effects of loading rate on strength and deformability of Maha Sarakham salt

Cited by 57 publications

References 13 publications

Effects of loading rate on strength and deformation characteristics of gypsum mixed sand

Effects of loading rate on strength and deformation characteristics of gypsum mixed sand

A particle mechanics approach for the dynamic strength model of the jointed rock mass considering the joint orientation

Effects of loading rate and temperature on tensile strength and deformation of rock salt

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