Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations

Cai, Ming; Kaiser, Peter K.; Tasaka, Y.; Maejima, T.; Morioka, Hiroshi; Minami, Masayuki

doi:10.1016/j.ijrmms.2004.02.001

Cited by 731 publications

(284 citation statements)

References 41 publications

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“…(IV) During the last phase, the coalescence of all microcracks takes place at σ d around 0.7 to 0.8 times the peak strength (Bieniawski 1967a, Martin 1997, Cai, Kaiser, Tasaka, Maejima, Morioka, & Minami 2004. The dilation strongly increases as well as the number of AE.…”

Section: Monotonic Behaviourmentioning

confidence: 98%

“…Figure 1: Stress-strain diagram exhibiting the different stages of the monotonic behaviour of brittle rocks, (Martin 1997, Cai, Kaiser, Tasaka, Maejima, Morioka, & Minami 2004 The brittle behaviour of rock is not limited to the simple compression experiments. It is observed also when the sample is subjected to a confinement as shown in Figure 2.…”

Section: Monotonic Behaviourmentioning

confidence: 99%

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Numerical modelling of the cyclic behaviour of rock material in the context of underground pumped storage hydroelectricity

2016

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The use of old mines as a reservoir in the context of pumped storage hydroelectricity rises the question of their stability especially upon cyclic loading due to filling and emptying the mines. This paper presents the formulation of a new constitutive law able to represent the inherently cyclic behaviour of rocks at low confinement. The main features of the behaviour evidenced by experiments in the literature depict a progressive degradation and deformation of the material with the number of cycles. A constitutive law based on a boundary surface model is developed. It represents the brittle failure of the material as well as its progressive degradation. It also encompasses a fatigue resistance under which no degradation of the material holds. Parameters are calibrated with respect to laboratory experiments from the literature. A parametric study is carried out to highlight the role of different parameters.

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Section: Monotonic Behaviourmentioning

confidence: 98%

Section: Monotonic Behaviourmentioning

confidence: 99%

Numerical modelling of the cyclic behaviour of rock material in the context of underground pumped storage hydroelectricity

2016

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“…In micromechanics point of view, after yielding, microcracks start to develop and by connecting the microcracks together, rock properties alter and provide possibility that rock may no longer remain functional. The stress level at which the microcracks connect is called "crack damage stress" [10].…”

Section: Fig 1 Mud Weight Windowmentioning

confidence: 99%

“…This stress level is defined as "crack damage stress" when cracks connect together. The study of previous researchers', [10], and) showed that the stress level of cracking can be formulized as below:…”

Section: Rock Materials Failurementioning

confidence: 99%

A Micromechanical Model to Estimate Borehole Collapse Pressure

Ghasempour

Moosavi

Aghighi

2017

Period. Polytech. Civil Eng.

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“…Moving from laboratory analysis, Cai et al (2004) have proposed generalized crack initiation and damage stress thresholds for rock slopes in terms of soliciting stresses and rock mass strength…”

Section: Crack Propagation Theorymentioning

confidence: 99%

Towards rockfall forecasting through observing deformations and listening to microseismic emissions

Arosio

Longoni

Papini

et al. 2009

Nat. Hazards Earth Syst. Sci.

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Abstract. Reliable forecasting of rockfall is a challenging task, mainly because of the lack of clearly noticeable forerunners as well as due to the geological and geo-mechanical complexity of the rock movements involved. Conventional investigation devices still present some drawbacks, since most measurements are generally carried out at isolated locations as well as on the surface only. Novel remote-sensing monitoring instruments, such as Terrestrial Laser Scanning (TLS) and Ground-Based Interferometric Synthetic Aperture Radars (GB-InSAR), are capable of inspecting an unstable slope with a high spatial and temporal frequency. But they still rely on measurements of the failure surface, from which displacement or velocity are measured. On the contrary, acoustic emission/microseismic monitoring may provide a deeper insight of stress and strain conditions within the subsurface rock mass. In fact, the capability to detect microseismic events originating within an unstable rock mass is a key element in locating growing cracks and, as a consequence, in understanding the slide kinematics and triggering mechanisms of future collapses. Thus, a monitoring approach based on the combination of classical methodologies, remote sensing techniques and microseismic investigations would be a promising research field. In the present paper we discuss the technologies and we illustrate some experiments conducted in the framework of a project whose final goal is the installation of an integrated monitoring and alerting system on a rockface nearby Lecco (Italy). In particular, we present a review of performances and applications of remote sensing devices and some results concerning a terrestrial laser scanner preliminary campaign. Then, we report findings regardCorrespondence to: L. Longoni (laura.longoni@polimi.it) ing amplitude, frequency content and rate of signals recorded during an in situ test carried out to evaluate the performance of three different microseismic transducers.

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Generalized crack initiation and crack damage stress thresholds of brittle rock masses near underground excavations

Cited by 731 publications

References 41 publications

Numerical modelling of the cyclic behaviour of rock material in the context of underground pumped storage hydroelectricity

Numerical modelling of the cyclic behaviour of rock material in the context of underground pumped storage hydroelectricity

A Micromechanical Model to Estimate Borehole Collapse Pressure

Towards rockfall forecasting through observing deformations and listening to microseismic emissions

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