### Abstract

Saturated sands particularly at low relative density commonly exhibit rises in excess pore pressure when subjected to earthquake loading. The excess pore pressure can approach a maximum value, limited by the initial vertical effective stress. After the completion of earthquake shaking, these excess pore pressures dissipate according to the consolidation equation, which can be solved to produce a Fourier series solution. It will be shown by manipulation of this Fourier series that excess pore pressure traces provide a method for back-calculation of coefficient of consolidation C-v. This method is validated against dissipation curves generated using known values of C-v and seen to be more accurate in the middle of the layer. The method is then applied to data recorded in centrifuge tests to evaluate C-v throughout the reconsolidation process following liquefaction conditions. C-v is seen to fit better as a function of excess pore pressure ratio than effective stress for the stress levels considered. For the soil investigated, C-v is about three times smaller at excess pore pressure ratio of 0.9 compared to excess pore pressure ratio of 0.

Original language | English |
---|---|

Pages (from-to) | 139-146 |

Number of pages | 8 |

Journal | Geotechnical Testing Journal |

Volume | 34 |

Issue number | 2 |

DOIs | |

Publication status | Published - Mar 2011 |

### Keywords

- liquefaction
- sands
- centrifuge modeling
- compressibility
- consolidation
- earthquakes
- LIQUEFACTION
- MODEL

### Cite this

*Geotechnical Testing Journal*,

*34*(2), 139-146. https://doi.org/10.1520/GTJ102914

}

*Geotechnical Testing Journal*, vol. 34, no. 2, pp. 139-146. https://doi.org/10.1520/GTJ102914

**Measurement of coefficient of consolidation during reconsolidation of liquefied sand.** / Brennan, A.J.; Madabhushi, S. P. G.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Measurement of coefficient of consolidation during reconsolidation of liquefied sand

AU - Brennan, A.J.

AU - Madabhushi, S. P. G.

PY - 2011/3

Y1 - 2011/3

N2 - Saturated sands particularly at low relative density commonly exhibit rises in excess pore pressure when subjected to earthquake loading. The excess pore pressure can approach a maximum value, limited by the initial vertical effective stress. After the completion of earthquake shaking, these excess pore pressures dissipate according to the consolidation equation, which can be solved to produce a Fourier series solution. It will be shown by manipulation of this Fourier series that excess pore pressure traces provide a method for back-calculation of coefficient of consolidation C-v. This method is validated against dissipation curves generated using known values of C-v and seen to be more accurate in the middle of the layer. The method is then applied to data recorded in centrifuge tests to evaluate C-v throughout the reconsolidation process following liquefaction conditions. C-v is seen to fit better as a function of excess pore pressure ratio than effective stress for the stress levels considered. For the soil investigated, C-v is about three times smaller at excess pore pressure ratio of 0.9 compared to excess pore pressure ratio of 0.

AB - Saturated sands particularly at low relative density commonly exhibit rises in excess pore pressure when subjected to earthquake loading. The excess pore pressure can approach a maximum value, limited by the initial vertical effective stress. After the completion of earthquake shaking, these excess pore pressures dissipate according to the consolidation equation, which can be solved to produce a Fourier series solution. It will be shown by manipulation of this Fourier series that excess pore pressure traces provide a method for back-calculation of coefficient of consolidation C-v. This method is validated against dissipation curves generated using known values of C-v and seen to be more accurate in the middle of the layer. The method is then applied to data recorded in centrifuge tests to evaluate C-v throughout the reconsolidation process following liquefaction conditions. C-v is seen to fit better as a function of excess pore pressure ratio than effective stress for the stress levels considered. For the soil investigated, C-v is about three times smaller at excess pore pressure ratio of 0.9 compared to excess pore pressure ratio of 0.

KW - liquefaction

KW - sands

KW - centrifuge modeling

KW - compressibility

KW - consolidation

KW - earthquakes

KW - LIQUEFACTION

KW - MODEL

U2 - 10.1520/GTJ102914

DO - 10.1520/GTJ102914

M3 - Article

VL - 34

SP - 139

EP - 146

JO - Geotechnical Testing Journal

JF - Geotechnical Testing Journal

SN - 0149-6115

IS - 2

ER -