Elastic properties of rocks

Belikov, B. P.

doi:10.1007/bf02590043

Stud Geophys Geod

1962

DOI: 10.1007/bf02590043

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Elastic properties of rocks

B. P. Belikov

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1984

2022

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Cited by 3 publications

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“…In fact, it is necessary to consider the situation that for example such materials as brown coal [26], marble [27], and glass [16,17] have almost the same X with markedly different mechanlcal properties. If X, reflecting brittleness, is used for rough sorting of materials, then the next property considered in criteria may be mechanical Inhomogenelty.…”

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confidence: 99%

“…We introduce parameter af/T -~ 9 Shown in Figs. 3 and 4 are results of plottlng curves for (2) and (3) for gray cast iron (coffin)(x = 6.3; @ = 1.11) [4], thermal-settlng plastic [2] (X " 0.266; ~.~-1.133), concrete [11,12] (X " 0.15;~ = 1.6), and rocks [15,26,27,36,37] (X = 0.05; -1.0). From the curves plotted it can be seen that (2) and (3) strongly overestimate strength and in an explicit way they contradict the Drukker postulation.…”

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Phenomenological criteria for the strength of brittle materials

Bich¹

1984

Soviet Mining Science

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The accuracy of calculations for bearing capacity of objects made of brittle materials depends to a considerable degree on the strength criteria used. Most widespread among them in engineering practice are statistical, mechanical, and phenomenological criteria only connecting strength with stress state. The achievements and disadvantages of this approach are well known. It is notes that recently in crack mechanics these criteria are being used more frequently for evaluating local strength [1]. As has been established, strength criteria for brittle materials in space u~, u2, and us describe surfaces open to the direction of compressive stresses symmetrical relative to the spatial diagonal u~ = o2 = us and intersecting this diagonal at a point of uniform triaxial tension. Recent experience has confirmed [2] that limiting surfaces, at least in the region of the starting coordinate, are shapes half way between a cone and a paraboloid, and they are deformed from three sides; the greatest deformation is observed close to the tip of the shape so that the deviator sections in this zone are close to an equilateral triangle, and consequently, limiting surfaces may be described by the first theory for strength. With an increase in the hydrostatic components of the stress tensor, buckling of deviator sections increases until appearance of an obvious tendency to grow into a circle or an equal-sided hexagon, and meridional sections are smoothed out. These mechanisms are the most distinct of those observed in testing rocks [3][4][5] and therefore they were the first to be reflected in criteria orientated towards these materials, particularly the Estrin criteria [6].Many criteria for brittle materials are modifications of the Moore criterion (which is explained by its simplicity and clear physical meaning) which describe in one way or another individual properties of the deformed surface. Absence of accounting for o~ in the Moore hypothesis reflected in insufficient curvature for deviator sections is overcome by substituting normal stress o n in the area of maximum shear by octahedral stress Ooc, and smoothing out of meridlonal curves has been provided byprescribing different forms (fractionallinear, exponential, power, etc.) of envelope curves [4,[7][8][9]. In spite of the fact that only two material constants are used with these criteria, i.e. compressive strength o c and tensile strength of, or cohesive modulus and internal friction angle, they are in fact multiconstant criteria since in order to determine these or any other parameters for the deformed limiting surface additional test data are necessary.Another method of creating criteria interpreting deformed surfaces is introduction into energy criteria based on the Nadai hypothesis o i = f(Uoc ) (the criteria of Botkln, Mirolyubov, Belandin, etc.) of a third invariant of the stress deviator [i0] or the LodG-Nadai parameter ~ [2]. The main drawback of these criteria is the extreme cumbersomeness and impossibility solution without a computer.Combined criteria are proposed co...

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Phenomenological criteria for the strength of brittle materials

Bich¹

1984

Soviet Mining Science

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Unconventional rocks elastic properties profile and geomechanical characterization

Hussain

Amao

Muqtadir

et al. 2020

Marine and Petroleum Geology

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Characteristics and Main Controlling Factors of Fractures within Highly-Evolved Marine Shale Reservoir in Strong Deformation Zone

Zhou

Wang

et al. 2022

Front. Earth Sci.

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Based on the systematical observations of cores, thin sections, and scanning electron microscope (SEM) sections, together with the testing data and characteristic parameters, this paper discussed the characteristics and controlling factors of fractures, and their control on shale gas accumulation in the Lower Cambrian Niutitang Formation black shale reservoir of Well YX1 in the northern Guizhou Province. The results show that macro structural fractures are common in the Niutitang Formation, which can be divided into shear fractures (e.g., high dip-angle shear fractures and low dip-angle slip fractures), tensional fractures, and tension-shear fractures. Non-structural fractures in microfractures can be divided into organic-related fractures and inorganic mineral-related fractures. Most of the structural fractures were filled and the types of fillings are diverse. The staggered relationships of fractures confirm the complexity of tectonic movement in the study area. The formation of structural fractures in Well YX1 is mainly controlled by the major fault. The influence of mineral composition and content, mechanical properties, brittleness, and organic matter content of rocks on the characteristics of the fractures are from the external manifestation of sedimentary environment. Affected by diagenetic evolution, organic matter-related fractures are not common. Compared with other shale gas reservoirs in China and abroad, the organic-rich shale reservoir of Well YX1 is characterized by both “geological sweet spots” and “engineering sweet spots”; however, strong deformation and faulting have led to the loss of shale gas and damage of the overpressure environment. Therefore, it is suggested that small-scale fractures, caused by tectonic movements but without large penetrating faults, are the most favorable for shale gas reservoirs. Based on the complicated tectonic setting in northern Guizhou, the formation pressure should be taken into account.

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Elastic properties of rocks

Cited by 3 publications

References 4 publications

Phenomenological criteria for the strength of brittle materials

Phenomenological criteria for the strength of brittle materials

Unconventional rocks elastic properties profile and geomechanical characterization

Characteristics and Main Controlling Factors of Fractures within Highly-Evolved Marine Shale Reservoir in Strong Deformation Zone

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