Rock Fracture and Rock Strength

Zhang, Zong-Xian

doi:10.1016/b978-0-12-802688-5.00003-8

Cited by 58 publications

(46 citation statements)

References 31 publications

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“…We argue that this is less possible in the heavy-rain zone of this study, because Miller (2008) found that the rain-triggered earthquakes occurred exclusively in karst geology where the rainwater can quickly flow into the underground karst network to induce earthquakes. In this study, the heavy-rain zone is mainly in the southern Central Ranges with primarily metamorphic rocks where its permeability is much lower than the karst areas (Ho, 1988;Wang et al, 2004;Zhang, 2016). This is consistent with our observation that no clear changes in seismicity are observed in the following weeks in the heavy-rain zone either defined as the 2-m contour or the 1.5-m contour (Figures 1a and 11).…”

Section: Seismicity In the Heavy-rain Zone In Weeks Before And After ...supporting

confidence: 90%

Investigating the Impacts of a Wet Typhoon on Microseismicity: A Case Study of the 2009 Typhoon Morakot in Taiwan Based on a Template Matching Catalog

et al. 2021

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Section: Seismicity In the Heavy-rain Zone In Weeks Before And After ...supporting

confidence: 90%

Investigating the Impacts of a Wet Typhoon on Microseismicity: A Case Study of the 2009 Typhoon Morakot in Taiwan Based on a Template Matching Catalog

et al. 2021

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“…In shock waves, characteristic impedance (Z) is defined as (e.g., Cooper 1996;Zhang 2016) where is the density of the material in which a shock wave is propagating and D is the velocity of the shock wave. Notice that D and ρ are variables rather than constants in shock waves.…”

Section: Shock Wavesmentioning

confidence: 99%

“…Characteristic impedance was suggested for evaluation and classification of rock masses, because the characteristic impedance of rock mass could represent the geological structures of the rock mass, e.g., joints, faults, bedding, and mineral composition, to a certain extent (Zhang 2016). Following this suggestion, Zhang et al (2020a) found six empirical relations between the characteristic impedance and main mechanical properties such as Young's modulus, Poisson's ratio, mode I fracture toughness and uniaxial compressive, tensile and shear strengths of intact rock, based on a great number of intact rock tests.…”

Section: Introductionmentioning

confidence: 99%

Characteristic Impedance and Its Applications to Rock and Mining Engineering

et al. 2023

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The characteristic impedance of a rock is defined as the product of the sonic velocity and the density of the rock. Based on previous studies, this article finds that: (1) For an intact rock, its characteristic impedance is a comprehensive physical property, since it is closely related with strengths, fracture toughness, Young’s modulus, and Poisson’s ratio. (2) For rock masses, their characteristic impedances either increase markedly or slightly with increasing depth. (3) The bursts of intact rocks in laboratory are dependent on their characteristic impedances to a great extent, and strong rock bursts happen mostly in the rocks with large characteristic impedance. (4) Rock burst occurrence in tunnel and mines has a close relation with the characteristic impedances of the rocks. (5) Laboratory experiments on different rock samples show that seismic velocity increases as applied stress rises, and field monitored results from coal mines indicate that in the areas where rock bursts happened, the seismic velocity was increasing markedly before or during the bursts. (7) Drillability of rock depends on the characteristic impedance of the rock and the rock with larger impedance has lower drillability or lower penetration rate. (8) The potential applications of characteristic impedance include evaluation and classification of rock masses, and prediction of rock burst proneness and drillability.

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“…The process takes place under the action of local disturbing forces exceeding the internal rock forces [2], [3]. Under the specified conditions, rock efforts result from the action of hard tools, hydraulic flows, and the developed waves and fields of diverse nature [6]. In this context, further progress and improvement are mainly accounted for rock-breaking tools if general approaches to the idea of the applied drilling techniques have been maintained.…”

Section: Analysis Of Recent Studies and Publicationsmentioning

confidence: 99%

“…buckling, chipping, cutting, crushing etc.) [6] is a distinctive feature of the majority of production methods of well drilling resulting in its fragmentation. Nevertheless, the examples cannot limit possible alternatives of a well bottom advance within the rock mass.…”

Section: Singling-out a Previously Unsolved Part Of The General Problemmentioning

confidence: 99%

Analyzing mechanics of rock breaking under conditions of hydromechanical drilling

Ihnatov¹

2021

Min. miner. depos.

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Purpose is to substantiate design factors and technological parameters of next-generation facilities of hydromechanical drilling basing upon the determined features of interaction between breaking pellets and rock mass. Methods. The studies of directionality features and bottomhole processes for rock mass breaking have been carried out using the current analytical methods and laboratory experiments. Among other things, certain mathematical and physical simulation techniques, methods of theoretical processing and interpretation of the research results under SolidWorks, Statgraphics, and Маthсаd environments, and a number of relevant instruments and materials have been applied. Following their technological sequence, the well bottomhole rock-breaking processes were simulated using a special laboratory stand equipped with a control-and-measuring unit (inclusive of a flowmeter, manometer, tachometer, and coordinate spacer among other things). Findings. Application perspectiveness of the combined techniques for rock breaking has been proved. Structural designs of the next-generation facilities for well drilling have been proposed. The pellet-impact drilling features have been analyzed from the viewpoint of its significant dynamic component during the rock mass breaking. Nature of the effect of breaking load rate on the results of bottomhole deformation processes has been identified. Efficiency of the proposed scheme to improve pellet-impact drilling based upon maximum use of a well bottomhole deformed by pellets has been proved. Measures to increase technical and technological indicators of pellet drilling have been considered. Requirements for the conditions stabilizing operation of a collar of the pellet-impact device have been outlined. Further research tendencies have been specified. Originality. It has been determined that compliance with specific geometrical and hydromechanical ratios, corresponding to the stable mode of a well sinking, is the factor required for reliable operation of hydromechanical drilling facilities. Practical implications. The results of stand-based tests as well as analytical studies may become the foundations to develop efficient engineering decision for hydromechanical well drilling with high technical and economic indicators. The data, concerning bottomhole rock breaking processes, are the basic ones to work out rational standard parameters of well sinking processes.

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Rock Fracture and Rock Strength

Cited by 58 publications

References 31 publications

Investigating the Impacts of a Wet Typhoon on Microseismicity: A Case Study of the 2009 Typhoon Morakot in Taiwan Based on a Template Matching Catalog

Investigating the Impacts of a Wet Typhoon on Microseismicity: A Case Study of the 2009 Typhoon Morakot in Taiwan Based on a Template Matching Catalog

Characteristic Impedance and Its Applications to Rock and Mining Engineering

Analyzing mechanics of rock breaking under conditions of hydromechanical drilling

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