Estimation of cracking and damage mechanisms in rock under triaxial compression by moment tensor analysis of acoustic emission

Chang, Soo-Ho; Lee, C.-I.

doi:10.1016/j.ijrmms.2004.04.006

Cited by 308 publications

(91 citation statements)

References 24 publications

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“…It also revealed that the damage in rocks has been initiated at the peak strength (i.e., peak damage variable ( ) is nonzero; see Table 2) [19,33]. These results in turn pose questions of what are the possible relations behind these parameters including statistical parameters ( and 0 ) and physical parameters (peak strain and peak stress).…”

Section: Stress-strain Curvesmentioning

confidence: 99%

“…Microcrack density was thought to be the governing factor for the elastic and fracture mechanical properties [33][34][35][36][37]. As shown in Figure 2, the stress-strain curve implies that the rock is first considered to be linear elastic with a constant modulus ( ) before the damage threshold is reached, and then the rock is thought to be damaged.…”

Section: Introductionmentioning

confidence: 99%

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A Statistical Damage Constitutive Model for Geomaterials under Plane-Strain Biaxial Stress State

Zhang

Wan

Wang

et al. 2017

Advances in Mathematical Physics

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The mechanical behavior of geomaterials under plane-strain biaxial stress state (PSBSS, a special case of biaxial stress state) is often considered in geotechnical structures such as highwall and longwall coal pillars. In this study, a modified statistical damage constitutive model based on Weibull distribution was established to explain the mechanical behavior of rocks under the PSBSS. The modified Wiebols-Cook criterion, Drucker-Prager criterion, and extremum method were adopted in this model to estimate the peak strength of rock, the strength level of microscopic element, and the statistical parameters of model, respectively. Besides, laboratory tests for brittle and ductile geomaterials under PSBSS were conducted using the modified surface instability detection apparatus to validate the accuracy of the proposed statistical damage model. Finally, the relationships between mechanical parameters and statistical parameters were studied and discussed.

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Section: Stress-strain Curvesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Statistical Damage Constitutive Model for Geomaterials under Plane-Strain Biaxial Stress State

Zhang

Wan

Wang

et al. 2017

Advances in Mathematical Physics

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“…Chang and Lee [43] have determined these two stress levels by monitoring volumetric strain changes and acoustic emission hits during uniaxial compression tests on Hwangdeung granite. Eberhardt et al [44] did the same for the Lac du Bonnet granite.…”

Section: Tested Rock and Clumped Particle Modelmentioning

confidence: 99%

Simulating fracture and friction of Aue granite under confined asymmetric compressive test using clumped particle model

Yoon

Zang

Stephansson

2012

International Journal of Rock Mechanics and Mining Sciences

104

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Fracture and friction behaviors of Aue granite (Erzgebirge, Germany) under confined asymmetric load are simulated by using the discrete element method. Clumped particle model is designed to account for stress heterogeneities under compressive load in the rock microstructure which affect both, fracture and friction properties. In contrast to conventional circular bonded particle assembly, clumped particle models consist of groups of neighboring individual particles

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“…The formation and/or propagation of fractures in hard rocks during the excavation phase and/or the operating phase in a repository can be monitored by means of acoustic emissions, a technique that was first applied to laboratory studies (e.g. Chang & Lee 2004;Lei et al 2004) and extended to full-scale studies in tunnels or drifts (e.g. Young & Collins 2001;Reyes-Montes et al 2005).…”

Section: Repositories In Hard Rock Formationsmentioning

confidence: 99%

Rock physics and geomechanics in the study of reservoirs and repositories

David

Ravalec-Dupin

2007

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Reservoir management for hydrocarbon extraction and repositories design for radioactive waste storage are two different areas in which rock physics and geomechanics provide valuable information. Although the targets and objectives are different, similar approaches and common attributes exist in both fields: safety assessment, short-to long-term prediction, integration of various scales of investigation, and remote monitoring, among others. Nevertheless, there are also important differences: reservoirs at depth are investigated through remote geophysical studies, well-logging and/or core samples retrieval, whereas direct access to repositories is possible through excavation in the host formation in which underground research laboratories can be constructed. We review a number of studies focusing on geomechanics and rock physics applied to the characterization of reservoirs and repositories, including laboratory experiments and predictive models, at different scales.Reservoir management and assessment of repository performance require the integration of different fields in Earth sciences, including geochemistry, geophysics, structural geology, and, in the case of interest here, rock physics and geomechanics. We present recent advances in the studies of reservoirs and repositories with the aim of emphasizing how rock physics and geomechanics help to obtain a better insight into important issues linked to reservoir management for exploitation of natural resources, and to repository safety assessment for hazardous waste storage in the geological environment.In the area of reservoir management, the importance of geomechanics in problems such as wellbore stability, hydraulic fracturing and subsidence is well known. Recently, there has been a growing interest in the development of a link between fluid flow simulators and geomechanical models. Several approaches have been proposed to incorporate the correct physics and to account for physical phenomena usually neglected in reservoir simulation. New techniques developed in laboratory studies provide relevant data for this integration. The approaches differ in the degree of coupling. The stronger the coupling, the more computationally demanding the simulation. Numerical experiments showed that coupling is of interest for poorly consolidated reservoirs such as chalk reservoirs. In other cases, one may wonder whether a more accurate modelling of production processes justifies the required computation cost. Complementary sensitivity studies have to be performed to better estimate the conditions in which the coupling is worthwhile.In the area of underground waste storage, the key issue is to design a repository as safe as possible for human activity and for the environment at the near surface, on time scales of the order of hundreds of years. This challenging task requires us to identify favourable geological targets for the storage, and to develop extensive scientific research in different fields, so as to obtain eventually a predictive model of the repository evolu...

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Estimation of cracking and damage mechanisms in rock under triaxial compression by moment tensor analysis of acoustic emission

Cited by 308 publications

References 24 publications

A Statistical Damage Constitutive Model for Geomaterials under Plane-Strain Biaxial Stress State

A Statistical Damage Constitutive Model for Geomaterials under Plane-Strain Biaxial Stress State

Simulating fracture and friction of Aue granite under confined asymmetric compressive test using clumped particle model

Rock physics and geomechanics in the study of reservoirs and repositories

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