Energy Dissipation and Pore Pressure Generation in Stress- and Strain-Controlled Cyclic Triaxial Tests

2018 ◽  
Vol 42 (4) ◽  
pp. 20170437 ◽  
Author(s):  
Carmine P. Polito ◽  
Henry H. M. Moldenhauer
Keyword(s):  
Energy Dissipation ◽  
Pore Pressure ◽  
Triaxial Tests ◽  
Stress And Strain ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests

Effect of load shape on relationship between dissipated energy and residual excess pore pressure generation in cyclic triaxial tests

2013 ◽  
Vol 50 (11) ◽  
pp. 1118-1128 ◽  
Author(s):  
Carmine Polito ◽  
Russell A. Green ◽  
Erin Dillon ◽  
Changbum Sohn
Keyword(s):  
Pore Pressure ◽  
Water Pressure ◽  
Laboratory Data ◽  
Excess Pore Pressure ◽  
Triaxial Tests ◽  
Dissipated Energy ◽  
Generation Model ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Load Shape

The energy dissipated in soil during cyclic loading can be used to predict the change in the pore-water pressure developed in the soil. To examine whether the energy required to cause liquefaction is dependent on or independent of the load shape applied, a series of 28 cyclic triaxial tests were performed using five different load shapes having a range of cyclic stress ratios. The five load shapes were applied to identically prepared specimens of clean sand and the dissipated energy – pore pressure generation characteristics examined. It was found that that the dissipated energy to cause initial liquefaction was normally distributed and independent of the load shape, although it is seemingly somewhat dependent on duration of loading. A corollary to this finding is that laboratory data from specimens tested using sinusoidal loadings can be used to calibrate the Green, Mitchell, and Polito (GMP) energy-based pore pressure generation model for use in predicting in situ pore pressures in soils subjected to nonsinusoidal loadings (e.g., earthquake loadings). Given the relative simplicity of the GMP model, these findings make the model an attractive alternative to implement in effective stress dynamic response codes.

Effect of the loading frequency on the sand liquefaction behaviour in cyclic triaxial tests

2021 ◽  
Vol 147 ◽  
pp. 106779
Author(s):  
Zhehao Zhu ◽  
Feng Zhang ◽  
Qingyun Peng ◽  
Jean-Claude Dupla ◽  
Jean Canou ◽  
...  
Keyword(s):  
Triaxial Tests ◽  
Loading Frequency ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Sand Liquefaction

Importance of Measuring Local Strains in Cyclic Triaxial Tests on Granular Materials

2009 ◽  
pp. 288-288-15 ◽  
Author(s):  
F Tatsuoka ◽  
S Teachavorasinskun ◽  
J Dong ◽  
Y Kohata ◽  
T Sato
Keyword(s):  
Granular Materials ◽  
Triaxial Tests ◽  
Cyclic Triaxial ◽  
Cyclic Triaxial Tests ◽  
Local Strains

Cyclic Pore Pressure Generation, Dissipation and Densification in Granular Mixes

2012 ◽  
pp. 66-84
Author(s):  
S. Thevanayagam ◽  
T. Shenthan
Keyword(s):  
Experimental Study ◽  
Pore Pressure ◽  
Triaxial Tests ◽  
Cyclic Tests ◽  
Contact Density ◽  
Coefficient Of Consolidation ◽  
Cyclic Triaxial Tests ◽  
Analysis Of Performance ◽  
Intergranular Void Ratio ◽  
Intergranular Void

Knowledge of cyclic load induced pore pressure generation, post-liquefaction dissipation and volumetric densification characteristics of sands, silty sands, and silts are important for the analysis of performance of loose saturated granular deposits in seismic areas. This article presents results from an experimental study of these characteristics for such soils containing 0 to 100% non-plastic silt. Pore pressure generation characteristics are studied using undrained cyclic triaxial tests. Pre- and post-liquefaction compressibility and coefficient of consolidation, and post-liquefaction volumetric densification characteristics are determined from consolidation data prior to cyclic tests and pore pressure dissipation tests following undrained cyclic tests. Effects of fines content on these characteristics compared to those of clean sands are examined in the context of intergranular void ratio and intergranular contact density concepts.

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