Study on triaxial creep test and theoretical model of cemented gangue-fly ash backfill under seepage-stress coupling

2020 ◽  
pp. 121722
Author(s):  
Jifeng Hou ◽  
Zhongping Guo ◽  
Jinbo Li ◽  
Lijuan Zhao
Keyword(s):  
Fly Ash ◽  
Theoretical Model ◽  
Creep Test ◽  
Triaxial Creep ◽  
Triaxial Creep Test

In situ triaxial creep test for investigating deformational properties of gravelly sliding zone soil: example of the Huangtupo 1# landslide, China

Landslides ◽  
2018 ◽  
Vol 15 (12) ◽  
pp. 2499-2508 ◽  
Author(s):  
Qinwen Tan ◽  
Huiming Tang ◽  
Lei Fan ◽  
Chengren Xiong ◽  
Zhiqiang Fan ◽  
...  
Keyword(s):  
Creep Test ◽  
Triaxial Creep ◽  
Triaxial Creep Test ◽  
Sliding Zone

A Creep-Damage Constitutive Model for Sandstone

2012 ◽  
Vol 170-173 ◽  
pp. 289-294 ◽  
Author(s):  
Wei Wang ◽  
Jun Lv ◽  
Hai Cheng Wang
Keyword(s):  
Constitutive Model ◽  
Creep Test ◽  
Creep Damage ◽  
Creep Model ◽  
Whole Process ◽  
Proposed Model ◽  
Accelerated Creep ◽  
Damage Constitutive Model ◽  
Triaxial Creep ◽  
Triaxial Creep Test

Based on the results obtained by the triaxial creep test, a creep-damage constitutive model for sandstone is presented by using the damage theory and by introducing the concept of “the whole process of damage” into Burgers creep model. The parameters of the model are determined by fitting the creep test data. The result shows that the proposed model can not only describe efficiently the variation of decay and steady creep under relatively low stress condition, but also give a satisfied representation of damage behavior in accelerated creep stage.

scholarly journals A case study on severe damage at a tunnel in serpentinite rock mass

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Y. Fujii ◽  
N. Ikeda ◽  
Y. Onoe ◽  
Y. Kanai ◽  
T. Hayakawa ◽  
...  
Keyword(s):  
Rock Mass ◽  
Creep Test ◽  
Triaxial Compression ◽  
Friction Angle ◽  
Primary Creep ◽  
Time Dependent ◽  
Severe Damage ◽  
Floor Heave ◽  
Triaxial Creep ◽  
Triaxial Creep Test

Abstract Face squeezing, floor heave, and buckling of invert were found after a 10-day holiday in 2014 around the serpentinite face of a tunnel in Hokkaido, Japan. The damage continued for over 2 months, extending 400 m toward the entrance causing a massive roof fall. The tunnel was excavated again with a circular section and extra-thick shotcrete, and the face had crossed the damaged part 6 years after the damage occurred. Uniaxial and triaxial compression tests were carried out to obtain the mechanical properties of the serpentinite to clarify the severe damage mechanism at the tunnel. The main experimental findings are as follows. The uniaxial compressive strength of the serpentinite samples was very low, and the ratio of the strength to the estimated overburden pressure was extremely low. The parameter n indicated that the time-dependent deformation of the serpentinite was not large but the same as ordinary rocks. All specimens showed strain-hardening in the triaxial compression test, and the friction angle was very low by the brucite content. Only primary creep was observed in the multistage triaxial creep test. The pressure on the shotcrete from rock mass for the damaged tunnel was enough to cause creep deformation and failure of shotcrete. From the above findings, designing the concrete lining that can support the earth and water pressure is recommended for tunnel excavation in such a weak serpentinite rock mass, particularly with a very low friction angle by brucite. Highlights Face squeezing, floor heave, and buckling of invert were found after a 10-day holiday around the serpentinite face in Hokkaido, Japan. The time-dependent deformation of the serpentinite was not large but the same as ordinary rocks. All specimens showed strain-hardening in the triaxial compression test, and the friction angle was very low by the brucite content. Only primary creep was observed in the multistage triaxial creep test. The severe damage to the tunnel was not a brittle creep failure of the serpentinite rock mass itself but the shotcrete lining.

The Studying Fabrication and Application of the Multifunctional Frozen Triaxial Test Apparatus

2013 ◽  
Vol 353-356 ◽  
pp. 388-391
Author(s):  
Shi Yin Zhang
Keyword(s):  
Triaxial Test ◽  
High Performance ◽  
Frozen Soil ◽  
Load Test ◽  
Test Apparatus ◽  
Test Parameter ◽  
New Type ◽  
Triaxial Creep ◽  
Set Up ◽  
Triaxial Creep Test

The frozen soil triaxial test apparatus is the basic equipment to study the mechanics property of the frozen soil. According to the norm of frozen soil test and the construction character of the present mine, the high-performance frozen soil triaxial test apparatus is made which could be used for many type tests, such as the static triaxial shear test, the dynamic triaxial test, the triaxial creep test, the routine triaxial strain route test, the routine triaxial proportion coordination test, the routine triaxial recycle load test, the routine triaxial concretion test and so on. The apparatus can realize the high surround pressure. During the test progress, the test parameter can be set up and the test date can be collected by the computer. The frozen soil triaxial test apparatus is a new type triaxial test apparatus.

scholarly journals Tensile Mechanical Properties of Fly Ash Concrete at Early Age for Thermal Stress Analysis

2020 ◽  
Author(s):  
Yoichi Mimura ◽  
Vanissorn Vimonsatit ◽  
Itaru Horiguchi ◽  
Isamu Yoshitake
Keyword(s):  
Fly Ash ◽  
Young’S Modulus ◽  
Compression Test ◽  
Creep Test ◽  
Elastic Strain ◽  
Young's Modulus ◽  
Tensile Creep ◽  
Early Age ◽  
Secant Modulus ◽  
Fly Ash Concrete

Abstract The present study investigates tensile properties of concrete with and without fly ash at early age, such as tensile Young’s modulus, strength and creep. Some Young’s modulus of fly ash concrete for thermal crack analysis was compared with the tensile Young’s modulus, secant modulus, initial tangent modulus and linear modulus obtained from the direct tension test and compression test. The tensile creep test was also performed to obtain the specific creep behavior considering decrease in elastic strain due to stiffness development at early age during creep test. The results show that the Young's modulus for crack evaluation can be obtained from the compression test based on the stress range less than the splitting tensile strength, while the compressive secant modulus was smaller than the tensile Young's modulus. The decrease of the elastic strain at early age contributes more to the evaluation of the tensile creep than the use of the fly ash mixing.

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