Effect of soil–infilled joints on the stability of rock wedges formed in a tunnel roof

Indraratna, Buddhima; Oliveira, David; Brown, E. T.; Assis, André Pacheco de

doi:10.1016/j.ijrmms.2010.05.006

Cited by 47 publications

(16 citation statements)

References 13 publications

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“…In addition to the boundary normal stiffness imposed by the surrounding rock mass, other parameters can affect the shear behaviour of rock interfaces such as the interface's surface roughness, the level of initial applied normal stress or the presence of infill (gouge) material with water in the joint interface. Even though a considerable amount of work has been conducted to describe how these factors affect the shear behaviour of joints under more conventional conditions (shearing under constant normal load -CNL: Ladanyi and Archambault, 1969 [5], Barton and Choubey, 1977 [6], Hutson and Dowding, 1990 [7], Indraratna and Buddhima, 2010 [8], Tatone and Grasselli, 2015 [9]), only a few studies with limited experimental data and analysis on the shear response of interfaces under CNS conditions exist (Seidel and Collingwood, 2001 [10], Indraratna et al [11]).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the mechanical behaviour of soft carbonate rock/grout interfaces for the design of offshore wind turbines

2019

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Since a few years, in France, the development and construction of offshore wind farms in different sites of the country is investigated. The wind turbines will be installed in soft carbonate rock formations (calcarenite, limestone), the mechanical properties of which can vary in a significant way according to the location of the site. Once installed, the bored piles will be sealed with grout in the hosting rock. It is well known that the mechanical behaviour of piles is mainly governed by the behaviour of the interface at the contact between the structure and the hosting rock. The study of the mechanical behaviour of these interfaces, being the weakest points in terms of mechanical resistance, is of great importance for the improvement of the design methods of such infrastructures. The shear response of the rock/grout interface is studied with laboratory experiments in the 3SR lab (Grenoble). The interface's mechanical properties are characterised by a series of shear tests under Constant Normal Stiffness (CNS), these conditions being the most representative of the in-situ conditions. Interface samples of a roughness representative of the in-situ drilling traces, are tested under different levels of applied normal stiffness. The shear response is studied for both monotonic and cyclic shear paths, while all tests are performed under wet conditions. The failure mechanisms are explored, taking into account the contrasting mechanical properties of the two materials composing the interface, as well as, the evolution of the geometrical profile of the interface. The correlation between roughness and the mechanical response of the interface is investigated and the importance of an existing roughness is discussed.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of the mechanical behaviour of soft carbonate rock/grout interfaces for the design of offshore wind turbines

2019

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“…ese soft fillings significantly weaken the shear strength of jointed rock and make the rock present more obvious heterogeneity and anisotropy. Infilled joints generally become the weakest position under shear which will easily trigger the whole instability of engineering rock [1][2][3][4]. erefore, the study of shear properties of infilled joints is of significance in both stability evaluation and reinforcement of engineering rock.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis Method of Shear Properties of Infilled Joints under Constant Normal Stiffness Condition

Wang

Zhang

2018

Advances in Civil Engineering

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e direct shear test is implemented in this paper for infilled joints under constant normal stiffness (CNS) condition with the finite difference software FLAC3D. e CNS condition was performed based on a servoprogram developed by FISH language. e effects of initial normal stress, undulating angle, and infilled ratio on the shear failure mode of infilled joints under CNS are revealed based on numerical simulation. It is found that the shear strength of infilled joints will grow along with the increase of the undulating angle and the decrease of the infilled ratio. e numerical analysis method is also able to quantify the effect of multiple factors (initial normal stress and infilled ratio) on shear properties of infilled joints. e model shows a good agreement with the experimental results available in the literatures. erefore, this study proposed and verified a numerical analysis method capable of studying the effects of normal stress, undulating angles, and infilled ratio on the shear behavior of infilled rock joints.

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“…Indraratna et al [5] put forward a joint material mode characterizing the mechanical characteristics of the discontinuous rock masses instead of equivalent continuum-based method considered to be unsuitable, and soil-infilled joint model was then employed to investigate the rock wedge in the crown of cavities. Afterwards, with the prevalence of Hoek-Brown criterion, Fraldi and Guarracino [6][7][8] proposed a curved failure mechanism on the roof of deep tunnels and derived upper bound solutions of collapsing region in the realm of plasticity theory together with variational principle.…”

Section: Introductionmentioning

confidence: 99%

Upper bound analysis of progressive failure mechanism of tunnel roofs in partly weathered stratified Hoek–Brown rock masses

Qin

Yang

Pan

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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Effect of soil–infilled joints on the stability of rock wedges formed in a tunnel roof

Cited by 47 publications

References 13 publications

Experimental investigation of the mechanical behaviour of soft carbonate rock/grout interfaces for the design of offshore wind turbines

Experimental investigation of the mechanical behaviour of soft carbonate rock/grout interfaces for the design of offshore wind turbines

Numerical Analysis Method of Shear Properties of Infilled Joints under Constant Normal Stiffness Condition

Upper bound analysis of progressive failure mechanism of tunnel roofs in partly weathered stratified Hoek–Brown rock masses

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