Numerical analysis of tunneling in slates with anisotropic time-dependent behavior

Lee, Ching-Lung; Shou, Keh-Jian; Chen, Sheng-Shian; Zhou, Wenchen

doi:10.1016/j.tust.2018.11.025

Cited by 34 publications

(6 citation statements)

References 32 publications

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“…For example, Zbek et al [4] conducted anisotropy ratio and anisotropy angle studies on the strength of four types of metamorphic rock. In a study by Lee et al [5], the anisotropy ratio and anisotropy angle of slate strength were taken into consideration, and excavation deformations of slate tunnels were successfully simulated. Current anisotropy studies regarding the hydraulic conduction of rock masses are generally focused on rock masses with joint fissures [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analyses of the Seepage and Stability of Layered Rock Slope Based on the Anisotropy of Hydraulic Conductivity: A Case Study in the Pulang Region of Southwestern China

Xia

Bai

et al. 2020

Water

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In the study of the seepage characteristics of layered rock slope under rainfall conditions, the majority of previous research has considered the hydraulic conduction to be isotropic, or only considered the anisotropy ratio of the hydraulic conductivity, ignoring the anisotropy angle. In the current study, a layered rock slope in the Pulang region was selected as an example. Then, based on the fitting parameters of the Van Genuchten model, pore water pressure sensitivity analyses of the layered rock slope were carried out. The anisotropy ratio and anisotropy angle were used to analyze the sensitivity of the seepage and stability of the layered rock slopes. The results show that as the anisotropy angle of hydraulic conductivity of layered rock slope decreased, the maximum volume water content of surface (MWCS) of layered rock slope gradually increased. Additionally, as the anisotropy ratio decreased and the anisotropy angle increased, the rising heights of the groundwater (RHG) of layered rock slope gradually increased. When the hydraulic conduction of layered rock slope was considered isotropic, the factor of safety (FS) tended to be overestimated. As the anisotropy ratio decreased and the anisotropy angle increased, the factor of safety (FS) of layered rock slope decreased. Prevention should be the objective for rock slopes with larger dip angles in the bedding plane in the Pulang region. This study provides feasible schemes for the evaluation of the seepage and stability of layered rock slopes in Pulang region of southwestern China.

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Section: Introductionmentioning

confidence: 99%

Sensitivity Analyses of the Seepage and Stability of Layered Rock Slope Based on the Anisotropy of Hydraulic Conductivity: A Case Study in the Pulang Region of Southwestern China

Xia

Bai

et al. 2020

Water

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“…Experimental tests show that the time-dependency of geomaterials may exhibit an anisotropic response which may be similar to the elastic anisotropic response Zoback 2013a, b, 2014;Li et al 2019). In some cases, both factors, -anisotropy and time-dependency-, must be taken into account, to estimate properly the actual behaviour of geomaterials, or even more properly represent the response of underground excavations (Dubey and Gairola 2008;Lee et al 2019;Li et al 2019). To simulate the excavation of tunnels in anisotropic time-dependent geomaterials, Manh et al (2015b) and Lee et al (2019) developed an alternative model through coupling the Burgers-creep viscoplastic (CVISC) and the ubiquitous-joint (UBI) models, and implemented this alternative model in FLAC.…”

Section: Introductionmentioning

confidence: 99%

“…In some cases, both factors, -anisotropy and time-dependency-, must be taken into account, to estimate properly the actual behaviour of geomaterials, or even more properly represent the response of underground excavations (Dubey and Gairola 2008;Lee et al 2019;Li et al 2019). To simulate the excavation of tunnels in anisotropic time-dependent geomaterials, Manh et al (2015b) and Lee et al (2019) developed an alternative model through coupling the Burgers-creep viscoplastic (CVISC) and the ubiquitous-joint (UBI) models, and implemented this alternative model in FLAC. Moreover, Weng et al (2010) proposed a shear-induced anisotropic degradation model involving time-dependent behaviour, and their conceptual model is extended based on the Burgers viscoelastic model.…”

Section: Introductionmentioning

confidence: 99%

Modelling underground excavations in rock masses with anisotropic time-dependent behaviour

Song

Rodríguez-Dono

Farfan

2022

Geomech. Geophys. Geo-energ. Geo-resour.

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When modelling rock masses that behave anisotropically and in addition present a time dependent behaviour, it is relevant to select a constitutive model able to represent their actual behaviour realistically. This article presents an alternative anisotropic time-dependent constitutive model able to predict the coupling between anisotropic behaviour and time-dependent (or viscous) behaviour. The viscous behaviour is simulated with the Burgers model and all elastic springs and viscous dashpots are considered to exhibit transversely isotropic properties. The proposed constitutive model has been implemented in the finite element method software CODE_BRIGHT. To verify the basic anisotropic elastic solution, it has been compared with that of PLAXIS results. And to verify the isotropic viscoelastic solution, it has been compared with analytical solutions. Furthermore, the proposed constitutive model has been used to predict the behaviour of samples from laboratory tests. Finally, parametric analyses have been carried out to investigate the influence of different factors on tunnelling responses, including the selection of different constitutive models, anisotropy of initial stresses and anisotropy of material properties. The proposed model provides an alternative method for the preliminary design of geotechnical engineering works involving geomaterials that exhibit anisotropic time-dependent behaviour.Article highlights • An anisotropic time-dependent model has been implemented in CODE_BRIGHT and validated. • The model can predict the coupled anisotropic time-dependent behaviour of geomaterials. • Parametric analyses have been performed to study the influence of different factors in ground response.

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“…Field observations have revealed that structural anisotropy causes obvious asymmetric tunnel deformation associated with the orientation of the bedding planes of the surrounding rocks (Meng et al, 2013;Chen et al, 2019;Liu et al, 2021). The deformation often exhibits pronounced time-dependent characteristics when the tunnel is under high geo-stress relative to the strength of the surrounding rocks (Panthi and Shrestha, 2018;Lee et al, 2019). It has been reported that the anisotropic time-dependent deformation of the surrounding rocks has signi cant adverse effects on the long-term structural stability of tunnels and should be considered during the design of the support system (Tian et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Effect of structural anisotropy on compressive creep behavior of composite rock based on digital image correlation

Tian

Shu

Chen

et al. 2022

Preprint

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In this study, a series of uniaxial creep tests were conducted on three-dimensional printed (3DP) composite rock specimens to investigate the effects of structural anisotropy on the time-dependent behavior of the rock. Digital image correlation (DIC) was used to monitor the evolution of the full-field strain during creep tests. The Burgers model was used to analyze the anisotropic creep behavior of the composite rock. When the specimen was subjected to a low creep stress (σcr ≤ 0.55σc (failure stress of the specimen)), the creep strain was mainly induced by transient creep, and the transient creep parameter Ek exhibited increasing order-shaped anisotropy. When the specimen was subjected to a high creep stress (σcr ≥ 0.70 σc), the creep strain of the specimen was dependent on steady creep, and the steady creep parameter ηm showed U-shaped anisotropy similar to the compression strength anisotropy of the specimen. DIC observations showed that the strain concentration along the soft layer was an important factor that resulted in anisotropic creep, and the time-dependent shearing slip between the soft layer and hard material enhanced the creep anisotropy under a high creep stress. The failure modes of the specimens showed that creep failure developed first in the soft layer, and the creep process had an insignificant influence on the failure modes of the composite rock.

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Numerical analysis of tunneling in slates with anisotropic time-dependent behavior

Cited by 34 publications

References 32 publications

Sensitivity Analyses of the Seepage and Stability of Layered Rock Slope Based on the Anisotropy of Hydraulic Conductivity: A Case Study in the Pulang Region of Southwestern China

Sensitivity Analyses of the Seepage and Stability of Layered Rock Slope Based on the Anisotropy of Hydraulic Conductivity: A Case Study in the Pulang Region of Southwestern China

Modelling underground excavations in rock masses with anisotropic time-dependent behaviour

Effect of structural anisotropy on compressive creep behavior of composite rock based on digital image correlation

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