Response of rocks to impact loading by bars with pointed ends

Goldsmith, Werner; Wu, Whang-Zong

doi:10.1007/bf01239036

Cited by 36 publications

(18 citation statements)

References 10 publications

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“…This result coincides very well with that in Ref. [14]. When doubling the duration time, the cutoff frequency to fracture rock remains constant.…”

Section: Examplessupporting

confidence: 92%

Response and energy dissipation of rock under stochastic stress waves

Deng¹,

Bian²

2007

J Cent. South Univ. Technol.

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The response and energy dissipation of rock under stochastic stress waves were analyzed based on dynamic fracture criterion of brittle materials integrating with Fourier transform methods of spectral analysis. When the stochastic stress waves transmit through rocks, the frequency and energy ratio of harmonic components were calculated by analytical and discrete analysis methods. The stress waves in shale, malmstone and liparite were taken as examples to illustrate the proposed analysis methods. The results show the harder the rock, the less absorption of energy, the more the useless elastic waves transmitting through rock, and the narrower the cutoff frequency to fracture rock. When the whole stress energy doubles either by doubling the duration time or by increasing the amplitude of stress wave, ratio of the energy of elastic waves transmitting through rock to the whole stress energy (i.e. energy dissipation ratio) is decreased to 10%−15%. When doubling the duration time, the cutoff frequency to fracture rock remains constant. However, with the increase of the amplitude of stress wave, the cutoff frequency increases accordingly.

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“…This result coincides very well with that in Ref. [14]. When doubling the duration time, the cutoff frequency to fracture rock remains constant.…”

Section: Examplessupporting

confidence: 92%

Response and energy dissipation of rock under stochastic stress waves

Deng¹,

Bian²

2007

J Cent. South Univ. Technol.

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“…On the other hand, other researchers suggested that the breaking occurs due to the interpenetration of tension cracks caused by neighboring disc cutters. The content of a study regarding the characteristics of rock fragments can be also divided into two subsections: the first concentrates on the interior of the rock (e.g., uniaxial compressive strength, regarding joint, moisture content, and other efficient factors [3][4][5][6][7][8]), and the second focuses on external factors including tool size, shape, and machine operating parameters [9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Rock Fragmentation Characteristics by TBM Cutting and Efficiency under Bi-Lateral Confinement

Chen

2018

Applied Sciences

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Abstract:In this study, the mechanisms of rock breakage are assessed using tunnel boring machine (TBM) disc cutters under bi-axial pressure. Sequential indentation tests were conducted on granite specimens using a tri-axial testing platform. The morphology and volume of the fractured surface were measured and analyzed using a three-dimensional surface profilometer. An analysis of rock breaking growth and efficiency was performed as well. When the minor confining pressure (σ 1 ) is constant, the results show that a larger difference in confining pressure leads to a larger volume of fractured surface, thereafter improving the rock-breaking efficiency even though the penetration energy is enlarged. On the other hand, when the major confining pressure (σ 2 ) is constant, the penetration energy increases proportionally with the σ 1 ; however, the volume of fractured surface is decreased, and the breaking efficiency is attenuated as well.

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“…Goldsmith and Wu [8] conducted impact penetration tests with conical and wedge bits, and obtained force-penetration curves for them. In the tests, bit force was measured with strain gauges attached near the end of the bit, and penetration was measured with a capacitive displacement sensor attached to the rod.…”

Section: Introductionmentioning

confidence: 99%

“…In the tests, bit force was measured with strain gauges attached near the end of the bit, and penetration was measured with a capacitive displacement sensor attached to the rod. Recently, Saksala et al [11] conducted impact penetration tests on three button tips embedded into the end of a rod (a special triple-button bit) using the same measurement method as Goldsmith and Wu [8]. This measurement method requires strain gauges to be attached near the end of the bit for eliminating the influence of elastic wave reflection between the bit and rod.…”

Section: Introductionmentioning

confidence: 99%