Numerical analysis of tunnelling with jet-grouted canopy

Ochmański, M.; Modoni, Giuseppe; Bzówka, J.

doi:10.1016/j.sandf.2015.08.002

Cited by 33 publications

(10 citation statements)

References 17 publications

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“…The five remaining parameters from 9 to 13 are representative of the intergranular strain concept which enable modelling the soil cyclic behavior. A set of parameters proposed by Niemunis and Herle [16] was successfully applied to study the cyclic response of sands [18][19][20][21][22]. Due to the insufficient data to calibrate the parameters of the intergranular strain state, the set of parameters given in [16] was used in the numerical analyses.…”

Section: Numerical Modelingmentioning

confidence: 99%

“…When considering soils under cyclic loads, the constitutive model can describe the cumulative strain/settlement and stiffness degradation without considering damping parameters. This constitutive model was already used to consider different geotechnical problems subjected to monotonic, cyclic as well as dynamic loads: a building [17,18]; shallow foundations [19,20]; single vertical piles [21]; saving-water basins [22]; unreinforced and reinforced piled embankments [23].…”

Section: Introductionmentioning

confidence: 99%

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3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

Phạm

Dias

2021

Applied Sciences

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This paper is based on small-scale laboratory tests (1:10) of a rigid inclusion-improved soil under normal gravity. A low area improvement ratio (2.4%) under monotonic and cyclic loading was used. 3D numerical calculations are performed to model these tests. The proposed numerical modeling is performed by the finite element method (FEM) using the ABAQUS software. A representative elementary volume model is suggested for reducing the calculation time. A hypoplastic constitutive model (HYP model) is applied for the load transfer platform (LTP). A total of three geometrical configuration cases of the experimental tests are numerically considered including a rigid slab over a mattress of 100 mm on the reinforced soil, a mattress of 100 mm on the reinforced soil, and a rigid slab over a mattress of 50 mm on the reinforced soil. The proposed numerical results are compared to the experimental data and the previous numerical results of Houda. The cyclic response of the systems is shown in terms of soil arching and settlements. The decrease in pile efficacy and the cumulative settlements are exhibited. The HYP model allows to better simulate the soil arching mechanisms inside the LTP than the CYsoil model used in the Houda’s research work. A good concordance between the proposed numerical results and the experimental data was obtained.

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Section: Numerical Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

Phạm

Dias

2021

Applied Sciences

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“…Hypoplastic models are generally described by a single nonlinear tensorial equation yielding the stress rate Ṫ as a function of stretching rate D [8]. The general stress-strain relation is as follows:…”

Section: Description Of the Hypoplastic Clay Modelmentioning

confidence: 99%

“…Concepts of applying the Hardening Soil model in such cases are noted [13]. The author decided to evaluate the suitability of the hypoplastic model -Hypoplastic Clay, implemented in GEO5 FEM software [14], for modelling soil response during excavation basing on the experience described in [8] of the effective use of a hypoplastic model for tunnel excavation.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Hypoplastic Clay Model for Deep Excavation Modelling

Mitew-Czajewska¹

2016

Archives of Civil Engineering

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“…The jet grouting technique has been extensively used to facilitate deep excavation and underground constructions in a wide spectrum of soils (e.g. Coulter and Martin 2006;Flora et al 2011;Yang et al 2011;Modoni and Bzówka 2012;Wang et al 2013;Ochmański et al 2015a;Hu et al 2017). It has been used for fulfilling functions like water-proofing and soil reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Lateral compression response of overlapping jet-grout columns with geometric imperfections in radius and position

et al. 2018

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Spatial variability in the radius of a jet-grout column is commonly encountered in practice. Although various prediction models for the column radius are available, they have been generally used to predict a nominal radius. The radius variation within a column has been seldom considered. In this study, the intracolumn radius variation was simulated as a lognormal stochastic process. This was done based on the existing prediction models where the column radius can be correlated with the undrained shear strength of in situ soils. A slab consisting of overlapping jet-grout columns was considered. The slab serves as an earth-retaining stabilizing structure in a deep excavation. The effects of radius variation on the mass performance of the slab were examined with the finite-element method. In addition, the positioning errors in jet-grout columns were also investigated. Owing to the random nature of the radius variation, Monte-Carlo simulations were performed to estimate the statistical characteristics of the mass performance of the slab. A strength reduction factor was introduced and tabulated to account for the effects of geometric imperfections in the column radius and column position. With the strength reduction factor, practitioners could quantitatively evaluate the effects of these geometric imperfections in design considerations. Practical recommendations on the column length and column spacing were also proposed.

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Numerical analysis of tunnelling with jet-grouted canopy

Cited by 33 publications

References 17 publications

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

3D Numerical Modeling of Rigid Inclusion-Improved Soft Soils Under Monotonic and Cyclic Loading—Case of a Small-Scale Laboratory Experiment

Evaluation of Hypoplastic Clay Model for Deep Excavation Modelling

Lateral compression response of overlapping jet-grout columns with geometric imperfections in radius and position

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