Rock salt dilatancy boundary from combined acoustic emission and triaxial compression tests

Alkan, Hakan; Cinar, Yildiray; Pusch, G.

doi:10.1016/j.ijrmms.2006.05.003

Cited by 167 publications

(91 citation statements)

References 15 publications

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“…Because failure begins by breaking the inter-granular bonds, the microstructure of a rock has a significant influence on the fracture progression behavior. Brittle fracturing of different rock types has been studied by many researchers (Brace et al 1966;Scholz 1968;Peng and Johnson 1972;Tapponnier and Brace 1976;Wong and Chau 1997;Eberhardt et al1999;Wong et al 2001;Alkan et al 2007;Wong and Wu 2014). While the majority of these studies tested intact rock, Ranjith et al (2004) used singly-and multiply-fractured granitic rock and characterized the behavior under uniaxial compression.…”

Section: Fracture Progression In Brittle Rockmentioning

confidence: 99%

Do joint geometrical properties influence the fracturing behaviour of jointed rock? An investigation through joint orientation

Wasantha

Ranjith

Zhang

et al. 2015

Geomech. Geophys. Geo-energ. Geo-resour.

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Failure of brittle rock is often progressive and understanding the fracture development process within rock masses is important to identify the precursors of failures. Joints in rock masses influence the fracture progression behavior and we studied the influence of joint orientation on fracture progression in jointed rock. Undrained triaxial tests were conducted on 54 mm diameter and 108 mm high intact and singly-jointed sandstone specimens. The joints in jointed specimens were made rough (joint roughness coefficient = 10-12) and embedded in six different orientations-0°, 30°, 45°, 60°, 75°and 90°-and three different combinations of confining and initial pore-water pressures were considered (confining pressure/pore-water pressure = 4/1, 10/4 and 25/10 MPa). An acoustic emission (AE) monitoring system was employed during all tests to monitor the fracture development within the test specimens. The post-failure patterns of specimens displayed three different failure mechanisms-shearing through intact material, sliding along the joint and a mixture of both shearing and sliding-depending on the joint orientation and confining pressure. The fracture progression behavior of the specimens showed a strong correlation with these failure mechanisms. Intact specimens and specimens with joints oriented at 0°, 30°, 90°failed by shearing. Nevertheless, the AE patterns of intact specimens and specimens with 90°-oriented joints contrasted with those of specimens with joints oriented at 0°a nd 30°. Specimens with joints oriented at 60°failed by sliding with a constant rate of acoustic event generation starting from the beginning of deviatoric loading. A mixed failure mechanism was observed for specimens with joints oriented at 45°and 75°. While the characteristics of both sliding and shearing failure were observed from the AE patterns of both 45°and 75°orientations, the shearing failure component of the 75°case was found to be a result of experimental limitations rather than real behavior. Finally, we propose a family of typical AE curves to assist with the characterization of the fracture progression behavior of jointed rock by taking confining pressures and failure mechanisms into consideration.

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Section: Fracture Progression In Brittle Rockmentioning

confidence: 99%

Do joint geometrical properties influence the fracturing behaviour of jointed rock? An investigation through joint orientation

Wasantha

Ranjith

Zhang

et al. 2015

Geomech. Geophys. Geo-energ. Geo-resour.

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“…Under the influence of the applied thermo-mechanical loads, rock salt behaves in different ways in the stress space. According to the experimental investigations conducted by several researchers, a boundary in the stress space known as dilatancy boundary separates the ductile behaviour of rock salt from the brittle response; (see Hunsche & Hampel (1999), Cristescu (1993), Günther & Salzer (2007), Schulze et al (2001), Hampel & Schulze (2007) and Alkan et al (2007)). When the stress state is below the dilatancy boundary, a time-dependent ductile deformation without any visible macroscopic fracture is observed.…”

Section: Computational Modelmentioning

confidence: 99%

Probabilistic Analysis of a Rock Salt Cavern with Application to Energy Storage Systems

et al. 2016

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“…The restoration of artificial cracks from drilling or excavation is also governed by this process [1]. The strain in this stage is about 2% of the total strain.…”

Section: Acoustic Emission Characteristics Of Rock Salt Under Uniaxiamentioning

confidence: 99%

“…The main reason for damage failure of the disposal rocks is the generation and development of cracks in excavated disturbed zones (EDZs) along the boundary of cavity and rock [1,2]. The mechanical properties of rock salts (evaporites with halide components) have been a major focus of study in last few decades [3,4].…”

Section: Introductionmentioning

confidence: 99%

Determination of Damage Constitutive Behavior for Rock Salt Under Uniaxial Compression Condition with Acoustic Emission

Chen¹,

Zhang²,

Song³

et al. 2015

TOCIEJ

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Abstract:The mechanical characteristics of rock salt have an important influence on the safety of the salt cavity. The acoustic emission (AE) technique was used to analyze the generation of microcracks in rock salt under uniaxial compression condition. By monitoring acoustic emission in whole process of stress -strain curve under uniaxial compression test, the damage characteristic of rock salt is obtained. The AE rate-strain curve is able to reflect the damage development process with better consistency evident with the cracks generating. The failure form of rock salt is mainly the shear failure under condition of low loading strain rate. After shear failure, a lot of small crushed particles spread on the surface of the failure surface. A damage constitutive model of rock salt is determined on the basis of acoustic emission characteristics, which could reflect the strength and deformation characteristics before the peak strength.

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Rock salt dilatancy boundary from combined acoustic emission and triaxial compression tests

Cited by 167 publications

References 15 publications

Do joint geometrical properties influence the fracturing behaviour of jointed rock? An investigation through joint orientation

Do joint geometrical properties influence the fracturing behaviour of jointed rock? An investigation through joint orientation

Probabilistic Analysis of a Rock Salt Cavern with Application to Energy Storage Systems

Determination of Damage Constitutive Behavior for Rock Salt Under Uniaxial Compression Condition with Acoustic Emission

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