An engineering theory of soil behaviour in unloading and reloading
Identifieur interne : 001761 ( Istex/Corpus ); précédent : 001760; suivant : 001762An engineering theory of soil behaviour in unloading and reloading
Auteurs : Roberto Nova ; Tomasz HueckelSource :
- Meccanica [ 0025-6455 ] ; 1981-09-01.
Abstract
Sommario: Si propone una legge costitutiva per descrivere il legame sforzi-deformazioni dei terreni sottoposti a processi di scarico e ricarico. Le equazioni costitutive sono formulate a tratti e definite su un dominio limitato dai luoghi di inversione di carico. Nella formulazione della legge costituitiva verranno introdotte delle variabili generalizzate di sforzo riferite all'ultimo punto di inversione di carico. Queste variabili sono legate alle deformazioni, riferite anche esse allo stato relativo all'ultimo punto di inversione di carico, da un tensore di cedevolezza variabile. Un'adeguata formulazione di questo tensore permette di modellare l'efferio di densificazione sotto carico deviatorico ciclico. Questa legge costitutiva interpreta bene i risultati sperimentali su argille normalmente consolidate e sovraconsolidate. La teoria permette anche di descrivere la dipendenza del percorso degli sforzi efficaci in condizioni non drenate dal grado di sovraconsolidazione, la mobilità ciclica dell'argilla in condizioni non drenate e il percorso degli sforzi efficaci in un processo di scarico e ricarico in un edometro. Per identificare il modello sono necessari solo tre parametri oltre a quelli necessari per identificare il comportamento del terreno vergine.
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DOI: 10.1007/BF02128442
Links to Exploration step
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<front><div type="abstract" xml:lang="it">Sommario: Si propone una legge costitutiva per descrivere il legame sforzi-deformazioni dei terreni sottoposti a processi di scarico e ricarico. Le equazioni costitutive sono formulate a tratti e definite su un dominio limitato dai luoghi di inversione di carico. Nella formulazione della legge costituitiva verranno introdotte delle variabili generalizzate di sforzo riferite all'ultimo punto di inversione di carico. Queste variabili sono legate alle deformazioni, riferite anche esse allo stato relativo all'ultimo punto di inversione di carico, da un tensore di cedevolezza variabile. Un'adeguata formulazione di questo tensore permette di modellare l'efferio di densificazione sotto carico deviatorico ciclico. Questa legge costitutiva interpreta bene i risultati sperimentali su argille normalmente consolidate e sovraconsolidate. La teoria permette anche di descrivere la dipendenza del percorso degli sforzi efficaci in condizioni non drenate dal grado di sovraconsolidazione, la mobilità ciclica dell'argilla in condizioni non drenate e il percorso degli sforzi efficaci in un processo di scarico e ricarico in un edometro. Per identificare il modello sono necessari solo tre parametri oltre a quelli necessari per identificare il comportamento del terreno vergine.</div>
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<abstract xml:lang="en"><p>Summary: A constitutive law is proposed for describing the stress-strain characteristic of soils in unloading-reloading. The constitutive equations are valid piecewisely between subsequent, appropriately formulated, stress reversal loci. The stress-strain relationships are formulated in terms of generalized stress and strain differences referred to the last stress reversal point and connected through a variable compliance tensor. The shear compaction effect is modelled by a suitable formulation of the compliance tensor. Specialization to conventional triaxial condition is given. As well as fitting available experimental data in unloading-reloading of normally consolidated and overconsolidated clays, the proposed constitutive relation can model the dependence on OCR of the shape of the undrained effective stress paths, the phenomenon of cyclic mobility of clay in undrained compression and the unloading-reloading stress paths in the oedometer. The theory requires the identification of only three material constants in addition to those pertinent to the usual elastoplastic theory of soil with which it may be easily combined.</p>
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<Para>Si propone una legge costitutiva per descrivere il legame sforzi-deformazioni dei terreni sottoposti a processi di scarico e ricarico. Le equazioni costitutive sono formulate a tratti e definite su un dominio limitato dai luoghi di inversione di carico. Nella formulazione della legge costituitiva verranno introdotte delle variabili generalizzate di sforzo riferite all'ultimo punto di inversione di carico. Queste variabili sono legate alle deformazioni, riferite anche esse allo stato relativo all'ultimo punto di inversione di carico, da un tensore di cedevolezza variabile. Un'adeguata formulazione di questo tensore permette di modellare l'efferio di densificazione sotto carico deviatorico ciclico.</Para>
<Para>Questa legge costitutiva interpreta bene i risultati sperimentali su argille normalmente consolidate e sovraconsolidate. La teoria permette anche di descrivere la dipendenza del percorso degli sforzi efficaci in condizioni non drenate dal grado di sovraconsolidazione, la mobilità ciclica dell'argilla in condizioni non drenate e il percorso degli sforzi efficaci in un processo di scarico e ricarico in un edometro.</Para>
<Para>Per identificare il modello sono necessari solo tre parametri oltre a quelli necessari per identificare il comportamento del terreno vergine.</Para>
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<Para>A constitutive law is proposed for describing the stress-strain characteristic of soils in unloading-reloading. The constitutive equations are valid piecewisely between subsequent, appropriately formulated, stress reversal loci. The stress-strain relationships are formulated in terms of generalized stress and strain differences referred to the last stress reversal point and connected through a variable compliance tensor. The shear compaction effect is modelled by a suitable formulation of the compliance tensor.</Para>
<Para>Specialization to conventional triaxial condition is given. As well as fitting available experimental data in unloading-reloading of normally consolidated and overconsolidated clays, the proposed constitutive relation can model the dependence on OCR of the shape of the undrained effective stress paths, the phenomenon of cyclic mobility of clay in undrained compression and the unloading-reloading stress paths in the oedometer. The theory requires the identification of only three material constants in addition to those pertinent to the usual elastoplastic theory of soil with which it may be easily combined.</Para>
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<abstract lang="it">Sommario: Si propone una legge costitutiva per descrivere il legame sforzi-deformazioni dei terreni sottoposti a processi di scarico e ricarico. Le equazioni costitutive sono formulate a tratti e definite su un dominio limitato dai luoghi di inversione di carico. Nella formulazione della legge costituitiva verranno introdotte delle variabili generalizzate di sforzo riferite all'ultimo punto di inversione di carico. Queste variabili sono legate alle deformazioni, riferite anche esse allo stato relativo all'ultimo punto di inversione di carico, da un tensore di cedevolezza variabile. Un'adeguata formulazione di questo tensore permette di modellare l'efferio di densificazione sotto carico deviatorico ciclico. Questa legge costitutiva interpreta bene i risultati sperimentali su argille normalmente consolidate e sovraconsolidate. La teoria permette anche di descrivere la dipendenza del percorso degli sforzi efficaci in condizioni non drenate dal grado di sovraconsolidazione, la mobilità ciclica dell'argilla in condizioni non drenate e il percorso degli sforzi efficaci in un processo di scarico e ricarico in un edometro. Per identificare il modello sono necessari solo tre parametri oltre a quelli necessari per identificare il comportamento del terreno vergine.</abstract>
<abstract lang="en">Summary: A constitutive law is proposed for describing the stress-strain characteristic of soils in unloading-reloading. The constitutive equations are valid piecewisely between subsequent, appropriately formulated, stress reversal loci. The stress-strain relationships are formulated in terms of generalized stress and strain differences referred to the last stress reversal point and connected through a variable compliance tensor. The shear compaction effect is modelled by a suitable formulation of the compliance tensor. Specialization to conventional triaxial condition is given. As well as fitting available experimental data in unloading-reloading of normally consolidated and overconsolidated clays, the proposed constitutive relation can model the dependence on OCR of the shape of the undrained effective stress paths, the phenomenon of cyclic mobility of clay in undrained compression and the unloading-reloading stress paths in the oedometer. The theory requires the identification of only three material constants in addition to those pertinent to the usual elastoplastic theory of soil with which it may be easily combined.</abstract>
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<topic>Mechanical Engineering</topic>
<topic>Automotive and Aerospace Engineering, Traffic</topic>
<topic>Civil Engineering</topic>
</subject>
<identifier type="ISSN">0025-6455</identifier>
<identifier type="eISSN">1572-9648</identifier>
<identifier type="JournalID">11012</identifier>
<identifier type="IssueArticleCount">6</identifier>
<identifier type="VolumeIssueCount">4</identifier>
<part><date>1981</date>
<detail type="volume"><number>16</number>
<caption>vol.</caption>
</detail>
<detail type="issue"><number>3</number>
<caption>no.</caption>
</detail>
<extent unit="pages"><start>136</start>
<end>148</end>
</extent>
</part>
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<identifier type="DOI">10.1007/BF02128442</identifier>
<identifier type="ArticleID">BF02128442</identifier>
<identifier type="ArticleID">Art3</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Pitagora Editrice Bologna, 1981</accessCondition>
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