Theoretical estimation of loosening pressure on tunnels in soft rocks

Jiang, Yujing; Yoneda, Hiroki; Tanabashi, Yoshihiko

doi:10.1016/s0886-7798(01)00034-7

Cited by 60 publications

(30 citation statements)

References 4 publications

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“…They are the solutions for the radius of the broken zone in Jiang and Shen (1997). When h = f = 1, the estimated r 2 and r 1 are the same solutions as in Jiang et al (2001).…”

Section: B = 0 and E= = 0 H =mentioning

confidence: 82%

“…For comparison, the parameters in Jiang et al (2001). are adopted for computation: c = 6.527 MPa, qr = 4.158 MPa, qr0 = 0.49 MPa, E = E= = 1381 MPa, = 0.22, = r = 30°, a = 125 cm.…”

Section: Discussionmentioning

confidence: 99%

“…However, considering the practical stress-strain behavior of real rocks, especially soft rock and broken rock, is not ideal elastoplastic, the Fenner and Kastner formulae are not appropriate for most cases. To solve this problem, some numerical methods that consider the strain-softening behavior and materialsoftening behavior of surrounding rock were proposed by different researchers (Vesic 1972;Wilson 1980;Yuan and Chen 1986;Ogawa and Lo 1987;Fu 1995;Ma and Zhang 1996;Jiang and Shen 1997;Martini et al 1997;Martin et al 1999;Carranza-Torres and Fairhurst 2000;Jiang et al 2001).…”

Section: Introductionmentioning

confidence: 99%

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New strength formulae for rock surrounding a circular opening

et al. 2013

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In this paper, the unified strength theory proposed by Yu Mao-hong in 1991 is used to develop new strength formulae for rock surrounding a tunnel. The new formulae can be applied to an elastic-plastic material. The formulae have a series of expressions with the unified parameter, especially variations such as the well-known Kastner and Airy formulae, which are widely used in rock mechanics and engineering. These formulae are derived on the basis of the Mohr-Coulomb strength criterion. For the strength-weakening (plastic-softening) of geomaterials, the analytical solutions for the radius of the plastic residual zones, radius of the plastic-softening zones, and displacement around the opening are presented according to the elastoplastic-softening -residual plastic, tri-linear stress-strain model. In addition, the derivation for the stress state in the surrounding rock is given. The Kastner formula, Airy formula, and available solutions can be considered as special cases in the new strength formula. The influence of softening, shear dilatancy, and different strength models on the results is analyzed. The results presented in this paper are useful for analyzing surrounding rock with various stress conditions and reinforcement of caves.Résumé : Dans cet article, la théorie unifiée de résistance proposée par Yu Mao-hong en 1991 est utilisée pour développer des nouvelles formules de résistance pour la roche entourant un tunnel. Les nouvelles formules peuvent être appliquées pour un matériau élastique-plastique. Les formules comportent une série d'expressions avec le paramètre unifié, particulièrement les variations qui incluent la formule bien connue de Kastner et celle d'Airy, qui sont couramment utilisées en mécanique des roches et en ingénierie. Ces formules sont dérivées sur la base du critère de résistance de Mohr-Coulomb. Pour la réduction de la résistance (adoucissement plastique) de géomatériaux, les solutions analytiques pour le rayon des zones plastiques résiduelles, pour le rayon des zones d'adoucissement plastique et pour le déplacement tout autour de l'ouverture, sont présentées selon le modèle plastique de contrainte-déformation tri-linéaire élasto-plastique-adoucissement-résiduel. De plus, la dérivation de l'état des contraintes de la roche environnante est donnée. La formule connue de Kastner, la formule d'Airy et les solutions disponibles peuvent être considérées comme des cas spéciaux de la nouvelle formule de résistance. L'influence de l'adoucissement, de la dilatance en cisaillement et des différents modèles de résistance sur les résultats est analysée. Les résultats présentés dans cet article sont utiles pour l'analyse de la roche environnante sous différentes conditions de contraintes et renforcements de cavités. [Traduit par la Rédaction]Mots-clés : roche environnante, théorie unifiée de résistance, dilatance en cisaillement, modèle de contrainte-déformation.

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“…They are the solutions for the radius of the broken zone in Jiang and Shen (1997). When h = f = 1, the estimated r 2 and r 1 are the same solutions as in Jiang et al (2001).…”

Section: B = 0 and E= = 0 H =mentioning

confidence: 82%

“…For comparison, the parameters in Jiang et al (2001). are adopted for computation: c = 6.527 MPa, qr = 4.158 MPa, qr0 = 0.49 MPa, E = E= = 1381 MPa, = 0.22, = r = 30°, a = 125 cm.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New strength formulae for rock surrounding a circular opening

et al. 2013

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“…The excavation radius of the study section is 5.20 m, and the basic parameters are listed in Table 2 according to the geological investigations, laboratory experiments and inverse calculation. Other mechanical parameters to evaluate the displacement of the rock mass with the strain-softening constitutive law are calculated according to the empirical formula [29]. The residual strength at the interface of the rock bolt is not easy to get because it is influenced by many factors.…”

Section: Geological Location Of Tawara Zaka Tunnel Japanmentioning

confidence: 99%

An analytical model considering interaction behavior of grouted rock bolts for convergence–confinement method in tunneling design

Yue

Jiang

Djamaluddin

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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“…These available studies, although distinguished from different failure criterions and post-failure behaviors, are generally based on the plasticity theory (Brown et al, 1983;Oreste & Peila, 1996;Jiang et al, 2001;Detournay, 1986;Carranza-Torres & Fairhurst, 1999;Alonso et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Study of Ground Response Curve (GRC) Based on a Damage Model / Badanie Krzywej Odpowiedzi Gruntu (Grc) W Oparciu O Model Pękania Skał

Molladavoodi¹

2013

Archives of Mining Sciences

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Analysis of stresses and displacements around underground openings is necessary in a wide variety of civil, petroleum and mining engineering problems. In addition, an excavation damaged zone (EDZ) is generally formed around underground openings as a result of high stress magnitudes even in the absence of blasting effects. The rock materials surrounding the underground excavations typically demonstrate nonlinear and irreversible mechanical response in particular under high in situ stress states. The dominant cause of irreversible deformations in brittle rocks is damage process.One of the most widely used methods in tunnel design is the convergence-confinement method (CCM) for its practical application. The elastic-plastic models are usually used in the convergence-confinement method as a constitutive model for rock behavior. The plastic models used to simulate the rock behavior, do not consider the important issues such as stiffness degradation and softening. Therefore, the use of damage constitutive models in the convergence-confinement method is essential in the design process of rock structures. In this paper, the basic concepts of continuum damage mechanics are outlined. Then a numerical stepwise procedure for a circular tunnel under hydrostatic stress field, with consideration of a damage model for rock mass has been implemented. The ground response curve and radius of excavation damage zone were calculated based on an isotropic damage model. The convergence-confinement method based on damage model can consider the effects of post-peak rock behavior on the ground response curve and excavation damage zone. The analysis of results show the important effect of brittleness parameter on the tunnel wall convergence, ground response curve and excavation damage radius.Keywords: rock damage, constitutive model, damage mechanics, convergence-confinement method, Strain SofteningAnaliza naprężeń i przemieszczeń powstałych wokół otworu podziemnego wymagana jest przy szerokiej gamie projektów z zakresu budownictwa lądowego, inżynierii górniczej oraz naftowej. Ponadto, wokół otworu podziemnego powstaje strefa naruszona działalnością górniczą wskutek oddziaływania wysokich naprężeń, nawet w przypadku gdy nie są prowadzone prace strzałowe. Reakcja materiału skalnego znajdującego się w otoczeniu wyrobisk podziemnych jest zazwyczaj procesem nieliniowym i nieodwracalnym, zwłaszcza w stanach wysokich naprężeń in situ. Główną przyczyną nieodwracalnych odkształceń skał kruchych jest pękanie.

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Theoretical estimation of loosening pressure on tunnels in soft rocks

Cited by 60 publications

References 4 publications

New strength formulae for rock surrounding a circular opening

New strength formulae for rock surrounding a circular opening

An analytical model considering interaction behavior of grouted rock bolts for convergence–confinement method in tunneling design

Study of Ground Response Curve (GRC) Based on a Damage Model / Badanie Krzywej Odpowiedzi Gruntu (Grc) W Oparciu O Model Pękania Skał

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