### Abstract

This paper investigates the impact of the following five assumptions on the accuracy of Newmark seismic deformation analysis applied to geosynthetic cover systems: i) the potential failure mass is noncompliant; 22) the dynamic response of the potential failure mass is uncoupled from displacement (slip); iii) permanent displacements accumulate in only one direction; iv) vertical ground motions do not influence permanent displacement; and v) the yield acceleration is constant. Information presented in the literature indicates the impact of the assumption of a noncompliant failure mass and the assumption of a seismic response uncoupled from displacement is insignificant for typical geosynthetic cover systems. The results of computer analyses indicate that the effects of two-way sliding and vertical ground motions can, in most practical cases, be neglected. However, the assumption of a constant yield acceleration, when based on residual (or large displacement) shear strength, may result in calculated displacements that are significantly larger than those calculated using a yield acceleration that degrades with accumulated displacement from a peak value to a residual, or large displacement, value. Overall, results of this investigation indicate that conventional Newmark analyses based upon residual shear strength yield conservative results when applied to geosynthetic cover systems.

Original language | English (US) |
---|---|

Pages (from-to) | 237-264 |

Number of pages | 28 |

Journal | Geosynthetics International |

Volume | 5 |

Issue number | 1-2 |

State | Published - 1998 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Geotechnical Engineering and Engineering Geology

### Cite this

*Geosynthetics International*,

*5*(1-2), 237-264.

**Newmark seismic deformation analysis for geosynthetic covers.** / Matasovic, N.; Kavazanjian, Edward; Giroud, J. P.

Research output: Contribution to journal › Article

*Geosynthetics International*, vol. 5, no. 1-2, pp. 237-264.

}

TY - JOUR

T1 - Newmark seismic deformation analysis for geosynthetic covers

AU - Matasovic, N.

AU - Kavazanjian, Edward

AU - Giroud, J. P.

PY - 1998

Y1 - 1998

N2 - This paper investigates the impact of the following five assumptions on the accuracy of Newmark seismic deformation analysis applied to geosynthetic cover systems: i) the potential failure mass is noncompliant; 22) the dynamic response of the potential failure mass is uncoupled from displacement (slip); iii) permanent displacements accumulate in only one direction; iv) vertical ground motions do not influence permanent displacement; and v) the yield acceleration is constant. Information presented in the literature indicates the impact of the assumption of a noncompliant failure mass and the assumption of a seismic response uncoupled from displacement is insignificant for typical geosynthetic cover systems. The results of computer analyses indicate that the effects of two-way sliding and vertical ground motions can, in most practical cases, be neglected. However, the assumption of a constant yield acceleration, when based on residual (or large displacement) shear strength, may result in calculated displacements that are significantly larger than those calculated using a yield acceleration that degrades with accumulated displacement from a peak value to a residual, or large displacement, value. Overall, results of this investigation indicate that conventional Newmark analyses based upon residual shear strength yield conservative results when applied to geosynthetic cover systems.

AB - This paper investigates the impact of the following five assumptions on the accuracy of Newmark seismic deformation analysis applied to geosynthetic cover systems: i) the potential failure mass is noncompliant; 22) the dynamic response of the potential failure mass is uncoupled from displacement (slip); iii) permanent displacements accumulate in only one direction; iv) vertical ground motions do not influence permanent displacement; and v) the yield acceleration is constant. Information presented in the literature indicates the impact of the assumption of a noncompliant failure mass and the assumption of a seismic response uncoupled from displacement is insignificant for typical geosynthetic cover systems. The results of computer analyses indicate that the effects of two-way sliding and vertical ground motions can, in most practical cases, be neglected. However, the assumption of a constant yield acceleration, when based on residual (or large displacement) shear strength, may result in calculated displacements that are significantly larger than those calculated using a yield acceleration that degrades with accumulated displacement from a peak value to a residual, or large displacement, value. Overall, results of this investigation indicate that conventional Newmark analyses based upon residual shear strength yield conservative results when applied to geosynthetic cover systems.

UR - http://www.scopus.com/inward/record.url?scp=0031784857&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031784857&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0031784857

VL - 5

SP - 237

EP - 264

JO - Geosynthetics International

JF - Geosynthetics International

SN - 1072-6349

IS - 1-2

ER -