Effects of the time-dependent behavior on strain softening of diatomaceous soft rock

1998 ◽  
Vol 4 (5) ◽  
pp. 1093-1096 ◽  
Author(s):  
Hongjian Liao ◽  
Chunming Ning ◽  
Masaru Akaishi ◽  
Longxiang Zhou
Keyword(s):  
Strain Softening ◽  
Soft Rock ◽  
Time Dependent ◽  
Dependent Behavior

scholarly journals Time Dependent Behavior of Soft Rock and Its Essential Interpretation.

1998 ◽  
pp. 1-10 ◽  
Author(s):  
Toshihisa Adachi ◽  
Fusao Oka ◽  
Hiroshi Soraoka ◽  
Masashi Koike
Keyword(s):  
Soft Rock ◽  
Time Dependent ◽  
Dependent Behavior

Numerical Modeling of the Constitutive Relationship of a Soft Rock Using a 3-D Elastic Visco-Plastic Model

2004 ◽  
Vol 261-263 ◽  
pp. 723-728
Author(s):  
Li Jun Su ◽  
Hong Jian Liao ◽  
Jian Hua Yin
Keyword(s):  
Constitutive Model ◽  
Strain Softening ◽  
Soft Rock ◽  
Time Dependent ◽  
Triaxial Tests ◽  
Flow Rule ◽  
Test Results ◽  
Stress Strain ◽  
Strain Behavior ◽  
Constitutive Formulation

In this paper, a diatomaceous soft rock is studied. Triaxial tests had been conducted on this soft rock. From the test results, it is found that the stress-strain curve of this soft rock has a notable strain-softening tendency. In order to study its time-dependent stress-strain behavior, a constitutive model that can describe not only the strain-hardening behavior, but also the strain-softening behavior must be constructed. Based on Perzyna’s fundamental assumptions of the elastic visco-palstic theory, a visco-plastic flow rule, and Yin and Graham’s 3-D elastic visco-palstic constitutive model (3-D EVP model), the constitutive formulation under a triaxial stress state is obtained in this paper. The derived formulation can be used to simulate the time-dependent stress-strain behavior of both consolidated undrained and consolidated drained triaxial tests of soils and rocks. In this paper, the constitutive formulation is used to simulate the time-dependent stress-strain behavior of consolidated undrained triaxial tests of the soft rock studied in this paper. The simulated results are compared with the triaxial test results. The comparison of the results shows that model predictions agree well with measured results. This demonstrates that the EVP model can be used to describe the time-dependent stress-strain behavior of the soft rock studied in this paper.

Time-dependent squeezing deformation mechanism of tunnels in layered soft-rock stratum under high geo-stress

2021 ◽  
Vol 18 (5) ◽  
pp. 1371-1390
Author(s):  
Zi-quan Chen ◽  
Chuan He ◽  
Jun Wang ◽  
Chun-chi Ma
Keyword(s):  
Deformation Mechanism ◽  
Soft Rock ◽  
Time Dependent ◽  
Rock Stratum

Time-dependent behavior of nitric oxide excited states under the effect of electron impact

2021 ◽  
Vol 28 (2) ◽  
pp. 024503
Author(s):  
Mohammed amin Ferdi ◽  
Abdelaaziz Bouziane ◽  
Mourad Djebli
Keyword(s):  
Nitric Oxide ◽  
Electron Impact ◽  
Excited States ◽  
Time Dependent ◽  
Dependent Behavior

Time-dependent behavior of retaining piles during pre-excavation dewatering in multi-layered saturated soils

2021 ◽  
Vol 137 ◽  
pp. 104300
Author(s):  
Yi Chong Cheng ◽  
Ri Hong Zhang ◽  
Kui Hua Wang ◽  
Zhi Yong Ai
Keyword(s):  
Time Dependent ◽  
Saturated Soils ◽  
Dependent Behavior

The flow properties of honey–malt spread

2017 ◽  
Vol 23 (5) ◽  
pp. 415-425 ◽  
Author(s):  
M Dianat ◽  
M Taghizadeh ◽  
F Shahidi ◽  
SMA Razavi
Keyword(s):  
Flow Behavior ◽  
Time Dependent ◽  
Malt Extract ◽  
Barley Malt ◽  
First Order ◽  
Dependent Behavior ◽  
Thixotropic Behaviour ◽  
Order Stress ◽  
Temperature Levels ◽  
Independent Behavior

In this study, the effect of barley malt extract at two brix levels (74 and 79 °Bx) and three ratios of malt extract/honey (65:35, 70:30 and 75:25) on the flow behavior properties of honey–malt spread at three temperature levels (35 ℃, 45 ℃ and 55 ℃) was investigated. Time-dependent behavior data of the spread samples were appropriately fitted to the Weltman, first-order stress decay with a zero stress value and first-order stress decay with a non-zero stress value models. Also, the Power-law, Herschel–Bulkley, Casson and Bingham models were used for curve fitting the time-independent behavior data. Regarding the R2 and root mean square error coefficients, the first-order stress decay with a non-zero stress value and Herschel–Bulkley models were selected as the suitable models to describe the flow behavior of samples. The results for time-dependent properties showed that spread samples exhibit a thixotropic behaviour, as the viscosity for all samples decreased with increase in shearing time at a constant shear rate of 50 s−1.

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