Time-dependent behaviour of deep clays

Giraud, Albert; Rousset, G.

doi:10.1016/0013-7952(95)00000-3

Cited by 39 publications

(17 citation statements)

References 6 publications

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“…After unloading during the elastic stage (Giraud and Rousset 1996), the strain does not restore completely, which shows that damage has already occurred in the so-called ''elastic stage''. Thus, the strain is decomposed to two parts: an elastic strain e e0 and a damage strain e ed in the elastic damage model.…”

Section: Elastic Damage Evolution Lawmentioning

confidence: 98%

“…An important set of data about the geomechanical behavior of this argillaceous rock has been collected. Besides its thermohydro-mechanical coupling behavior (Bastiaens and Demarche 2003;Li et al 2006;Chen et al 2011a;Lima 2011) and the time dependent (Bruyn et al 1987;Giraud and Rousset 1996;Cui et al 2009;Yu 2010) behavior, lots of data (Wemaere et al 1997;and Bastiaens and Demarche 2003;Bastiaens et al 2007) indicates that Boom clay presents anisotropic mechanical properties. Both laboratory and in situ test results indicate that the stiffness in the horizontal direction (parallel to bedding plane) is higher than that in the vertical direction (Piriyakul and Haegeman 2009;Lima 2011;Chen et al 2011a).…”

Section: Introductionmentioning

confidence: 95%

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A Transversely Isotropic Damage Model for Boom Clay

Chen

et al. 2013

Rock Mech Rock Eng

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Boom clay can be considered as a transversely isotropic geomaterial. However, due to lack of experimental evidence and data base, it is still difficult to describe the transversely isotropic plastic behavior of this argillaceous rock. In this paper, we present first, by means of an experimental approach, the main features of the mechanical properties of Boom clay. Then, combining the transversely isotropic elastic model and the modified MohrCoulomb criterion, a suitable constitutive model is introduced so as to fully describe the mechanical behavior of the studied material, in which, an elastic damage law which takes into consideration, the transversely isotropic effect, a plastic hardening law and a plastic damage law were introduced to describe the nonlinear elastic, hardening and softening behavior of Boom clay. As a preliminary step, the evolution law of both elastic moduli and Poisson's ratio during the elastic stage was obtained by direct analysis of the test data. The synchronism of the elastic damage in both transversal and axial directions was proved by this method. Some of the parameters of the model in the elastic stage were also determined by direct analysis method and further verified by back analysis. Other unknown parameters in the model were determined by back analysis.

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Section: Elastic Damage Evolution Lawmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 95%

A Transversely Isotropic Damage Model for Boom Clay

Chen

et al. 2013

Rock Mech Rock Eng

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“…The reference set of main influence factors on metrocaused settlement is listed in Table 1. It is composed of the best index values of these main influence factors, which is selected from the cases of metro-caused dynamic settlement occurred in the past (Taiebat et al 2007;Zhang 2007;Popescu et al 2006;Lou et al 2004;Trautner and Arvidsson 2003;Chen 2003;Hu et al 2001;Zhou and Gong 2001;Giraud and Rousset 1996;Matasovic and Tucetic 1992;Hyodo et al 1988), where the burial depth of dynamic settlement soil refers to the space between tunnel bottom and subsoil prone to dynamic settlement.…”

Section: Hierarchy Of Influence Factors and Their Reference Setmentioning

confidence: 99%

“…Based on Table 1 and the previous experience (Taiebat et al 2007;Zhang 2007;Popescu et al 2006;Lou et al 2004;Trautner and Arvidsson 2003;Chen 2003;Hu et al 2001;Zhou and Gong 2001;Giraud and Rousset 1996;Matasovic and Tucetic 1992;Hyodo et al 1988), the reference sequence for the metro-caused settlement of soft soil is selected in order to use in the grey correlationhierarchy analysis, listed in Table 9.…”

Section: Case Studymentioning

confidence: 99%

Grey correlation-hierarchical analysis for metro-caused settlement

2011

Environ Earth Sci

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Monitoring Shanghai metro tunnels and their surroundings indicates that the maximum settlement caused by metro operation for years has been more than 25 cm in soft soil of tunnel bottom, which has seriously affected the normal operation of subway, and even caused some old house cracking around subway lines. To investigate main influence factors on metro-caused settlement so as to provide the basis for the control of metro-caused settlement, the analytical hierarchy process was adopted to make their weight arrangement. With the experience analogy and grey correlation theory, the grey correlationhierarchical analysis method was proposed to evaluate the possibility of metro-caused settlement in soft soil of tunnel bottom. The correlation of metro-caused settlement and its influence factors (such as dynamic load conditions of metro, soil conditions, burial conditions of soil prone to dynamic settlement, and hydrogeology conditions) was probed. Taking Shanghai Yangtze River Tunnel project in China (it is now the largest shield tunnel in the world) as an example, the division estimation and the comprehensive evaluation of possibility and severity for metro-caused settlement were also done. The results were observed as follows: (1) the severity of settlements caused by dynamic load of metro in soft soil of tunnel bottom at the same position increases as the speed of subway trains increases;(2) On comparison between the foundations of silty clay and clayey silt, the former is generally more prone to the metro-caused settlement under the same conditions as dynamic load conditions of metro, void ratio of soil, natural water content of soil, burial conditions, and hydrogeology conditions; (3) the grey correlation-hierarchical analysis method is more applicable than grey correlation method for the possibility estimation of metro-caused settlement in the soft soil of tunnel bottom; (4) it may provide the reference for the possibility evaluation of metro-caused settlement in other similar projects.

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“…Other viscous rocks such as shales or marls cannot be considered as viscous fluids and a long-term resistance must be accounted for. In this case, the larger class of viscoplastic constitutive laws of Perzyna type has been proposed by several authors [1,21]. One of these, the Norton-Hoff law used here for illustration permits a direct extension to include strain hardening (or softening) as well as internal friction.…”

Section: The Direct Problem Pmentioning

confidence: 99%

Parameter identification for lined tunnels in a viscoplastic medium

Lecampion

Constantinescu

Minh

2002

Num Anal Meth Geomechanics

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This paper is dedicated to the identification of constitutive parameters of elasto-viscoplastic constitutive law from measurements performed on deep underground cavities (typically tunnels). This inverse problem is solved by the minimization of a cost functional of least-squares type. The exact gradient is computed by the direct differentiation method and the descent is done using the Levenberg-Marquardt algorithm. The method is presented for lined or unlined structures and is applied for an elastoviscoplastic constitutive law of the Perzyna class. Several identification problems are presented in one and two dimensions for different tunnel geometries. The used measurements have been obtained by a preliminary numerical simulation and perturbed with a white noise. The identified responses match the measurements. We also discuss the usage of the sensitivity analysis of the system, provided by the direct differentiation method, for the optimization of in situ monitoring. The sensitivity distribution in space and time assess the location of the measurements points as well as the time of observation needed for reliable identification.

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Time-dependent behaviour of deep clays

Cited by 39 publications

References 6 publications

A Transversely Isotropic Damage Model for Boom Clay

A Transversely Isotropic Damage Model for Boom Clay

Grey correlation-hierarchical analysis for metro-caused settlement

Parameter identification for lined tunnels in a viscoplastic medium

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