A Simplified Coupled Soil-Pore Water Pressure Generation for Use in Site Response Analysis

Moreno-Torres, Oscar; Hashash, Youssef M. A.; Olson, Scott M.

doi:10.1061/41095(365)314

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…The decrease of the CSR value results from the degradation of the shear modulus of the soil that can be related to the pore water pressure ratio R u , Eq. 9, (Matasovic and Vucetic 1993;Chang et al 2007;Moreno-Torres et al 2010):…”

Section: Resultsmentioning

confidence: 99%

Use of pore pressure build-up as damage metric in computation of equivalent number of uniform strain cycles

et al. 2018

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The build-up of earthquake-induced excess pore-water pressure may be viewed as analogous to the cumulative damage of saturated granular materials caused by cyclic loading, and consequently as a damage metric when converting an irregular earthquake loading to an equivalent number of uniform cycles, Neq. In this paper, a comprehensive series of strain-controlled tests have been conducted using the new combined triaxial simple shear (TxSS) apparatus developed at Institute de Recherche d’Hydro-Quebec (IREQ) in collaboration with the geotechnical group at the Université de Sherbrooke to verify the hypothesis of adopting the pore-water pressure ratio, Ru, as a damage metric when converting earthquakes to an equivalently damaging number of uniform strain cycles. Different reconstituted saturated samples of Baie-Saint-Paul, Carignon, and Quebec sands have been tested under undrained conditions up to liquefaction. The experimental results from this study have been utilized to develop an empirical expression to compute Neqγ from both the number of cycles required to trigger liquefaction, Nliq, and the material parameter, r. The parameter r had been experimentally calibrated a priori from a separate set of tests using uniform strain cycles following the theoretical framework outlined by Green and Lee in 2006. The present results reveal that the measured pore-water pressure ratio, Ru, is in agreement with predicted cumulative damage using the Richart and Newmark (R–N) hypothesis. However, the Palmgren–Miner (P–M) hypothesis underestimates the cumulative damage (i.e., the generated pore-water pressure) during cyclic loading.

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Section: Resultsmentioning

confidence: 99%

Use of pore pressure build-up as damage metric in computation of equivalent number of uniform strain cycles

et al. 2018

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“…Introducing the degradation indexes, the relationship proposed by Moreno-Torres et al [19] is obtained:…”

Section: Cyclic Stress-strain Behaviourmentioning

confidence: 99%

“…Given the proportionality between the number of cycles, N, and the damage parameter,  (eq. 19), any pore pressure change can be expressed as a variation of the normalized damage parameter, / L (see [26] for details).…”

Section: Generation Of Excess Pore Water Pressurementioning

confidence: 99%

A numerical model for non-linear coupled analysis of the seismic response of liquefiable soils

Tropeano

Chiaradonna²,

d’Onofrio³

et al. 2019

Computers and Geotechnics

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“…The modified hyperbolic model MRDF+D (modulus reduction and damping curve fit using a reduction factor) which simultaneously match modulus reduction and damping soil curves for nonlinear site response analysis was introduced by Phillips and Hashash (2009) and it was modified to incorporate the degradation indices defined above. Then, Moreno et al (2010) proposed the following equations to compute shear stress values (t) during loading and unloading -reloading, respectively, corresponding to a given strain.…”

Section: Simplified Quasi-coupled Hyperbolic Stress-strain Cons-titutmentioning

confidence: 99%

Introduction of a quasi-coupled hyperbolic stress-strain constitutive model

Moreno-Torres

Salas-Montoya

Vásquez-Varela

2018

IIT

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Simplified nonlinear effective stress constitutive models are commonly used in one-dimensional (1D) geotechnical site response analysis for assessment of porewater pressure generation and liquefaction potential in soft soil deposits. This study presents the performance of a 1D quasi-coupled constitutive model termed MRDF + u (modulus reduction and damping curve fit using a reduction factor and including porewater pressure generation, u) at a particular history case (i.e., Port Island, Japan), where liquefaction effects have been reported and the site could be potentially liquefied again. The study included evaluation of the performance of two porewater pressure generation models (Dobry-PWP and GMP-PWP models) coupled into the MRDF + u constitutive model using the Port Island history case. The new coupled model reasonably captures the soil cyclic behavior observed in the history case and may be used to perform effective stress-based 1D site response analysis in engineering practice.

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A Simplified Coupled Soil-Pore Water Pressure Generation for Use in Site Response Analysis

Cited by 6 publications

References 9 publications

Use of pore pressure build-up as damage metric in computation of equivalent number of uniform strain cycles

Use of pore pressure build-up as damage metric in computation of equivalent number of uniform strain cycles

A numerical model for non-linear coupled analysis of the seismic response of liquefiable soils

Introduction of a quasi-coupled hyperbolic stress-strain constitutive model

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