Study on Energy Consumption Characteristics of Different Tools under Impact Load

Zhao, Fei; Wang, Haifan; Ye, Zhouyuan; Liu, Yonghong; Yu, Li

doi:10.1155/2019/3104102

Cited by 5 publications

(6 citation statements)

References 17 publications

(18 reference statements)

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“…In the literature [47][48][49][50][51][52][53][54][55][56][57][58], it is proposed to use measures to alleviate rockburst intensity, such as large-diameter drilling to increase fractures and water injection to rock (coal) seams.…”

Section: Discussion Of (Dm/dt)mentioning

confidence: 99%

Rockburst Occurrence Mechanism Based on the Self-Sustaining Time-Varying Structure of Surrounding Rock

Fan

Zhao

Wang

et al. 2020

Shock and Vibration

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Rockburst is one of the major disasters that threaten the safety of personnel and equipment underground and affect the normal production of the system. At present, there are many kinds of research on rockburst occurrence mechanisms, but most of them are based on statics and do not consider the time-varying effect of surrounding rock state. Regarding the stress state and characteristics changing with time of the surrounding rock support structure and the internal parameters after the tunnel excavation is analyzed qualitatively in this paper, the concept of the “self-sustaining time-varying structure of the surrounding rock” is put forward. The “self-sustaining time-varying structure of the surrounding rock” is regarded as a nonperiodic time-varying system with a single degree of freedom, then its dynamic characteristics are analyzed by using the momentum theorem of the particle system. The results show that when the mass of the self-sustaining time-varying structure changes with time and d m / d t < 0 , the rockburst may be induced by the free vibration with increasing amplitude. The faster the d m / d t changes, the more violent the rockburst is. This explains the rockburst occurrence mechanism from a new angle and explains the phenomenon that most rockburst occurs when σ θ was lower than σ c better.

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Section: Discussion Of (Dm/dt)mentioning

confidence: 99%

Rockburst Occurrence Mechanism Based on the Self-Sustaining Time-Varying Structure of Surrounding Rock

Fan

Zhao

Wang

et al. 2020

Shock and Vibration

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“…is calculation model is denoted as the S model. Based on the hypothesis of isotropy, uniformity, and continuity of rock under external loading, as one of the most popular strength theories used in rock mechanics, the Mohr-Coulomb criterion judged whether the crack or rock is damaged according to the relationship between Mohr's circle of stress and the crack or rock strength envelope [27]. Considering the Mohr-Coulomb criterion and the sliding crack model in Figure 2,…”

Section: Sliding Crack Modelmentioning

confidence: 99%

Mesomechanism of Effects of Water on Strain Rockburst Prevention

Liu

Zhao

et al. 2021

Advances in Civil Engineering

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In deep mining engineering, rockburst is an instantaneous release of a large amount of strain energy stored in rock mass, in which occurrence is closely related to initial high stress state and excavation unloading effect. Water can permeate the pores and cracks of rocks and often have a significant effect on the failure mode under stress. The effect of water on rockburst prevention and control has been observed by many researchers in rock engineering. However, the mechanism of rockburst prevention by means of water is seldom researched. In this study, the forming process of strain rockburst is introduced, and the key point to the mechanism of water spraying or water injection to prevent strain rockburst is that the presence of water could cause a transformation of failure mode of rocks during the strain rockburst incubation stage, thereby destroying its formation. In order to explore the specific influence of water on the change of rock failure mode, a crack propagation model with a single inherent main crack and two wing cracks was established, and the most-easily cracking angle ξ was proposed to analyze the mechanism of the failure mode influenced by different water contents. According to the calculated results of ξ , it was found that when rock is completely dry, the wing crack wing extends towards the loading direction, and ξ is around 90° which mainly induces its splitting failure; conversely, as the water content increases, the wing crack deviates from the loading direction; ξ is around 100° which mainly causes its shear failure. The proposed model in this study can reveal the mechanism of the effects of water on strain rockburst prevention in the view of mesoscale.

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“…It is worth noting that both rock-breaking tools have a rectangular indenter, this is also the focus of this paper. Zhao et al [29] took the brittle rock granite as the research object to test the performance of different tools. Guha et al simulated flat punch indentation from the perspective of a moulding technique using a modified Fleck-Hutchinson plasticity model [30].…”

Section: Rectangular Indenter Contactmentioning

confidence: 99%

“…w represents strain energy density per unit length. en, substitute equations (30)-(34) into equation (29) and obtain that…”

Section: Bias Indentation Stress Intensity Factormentioning

confidence: 99%

Calculation of Stress Intensity Factors at Both Ends of the Indenter under Eccentric Loads

Duo

2020

Mathematical Problems in Engineering

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During rock breaking by drill, cone rolls on the rock surface and contact between gear teeth and surface is basically positive Mode-I plane indentation and bias Mode-I plane indentation. During bias action, there will be an asymmetrical Mode-I singular stress field at both ends of the indenter. The stress field singularity is of the same order as Mode-I crack tip and with the same function distribution. In this paper, based on the J2 integral conservation law, a new method is established for solving stress intensity factor of bias Mode-I plane indentation, which not only provides respective stress intensity factor of both ends of the indenter but also compares relations between eccentricity, partial load, and stress intensity factor. The study not only provides a method for establishment of new cone drill engineering design but also improves rock layer boring efficiency.

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Study on Energy Consumption Characteristics of Different Tools under Impact Load

Cited by 5 publications

References 17 publications

Rockburst Occurrence Mechanism Based on the Self-Sustaining Time-Varying Structure of Surrounding Rock

Rockburst Occurrence Mechanism Based on the Self-Sustaining Time-Varying Structure of Surrounding Rock

Mesomechanism of Effects of Water on Strain Rockburst Prevention

Calculation of Stress Intensity Factors at Both Ends of the Indenter under Eccentric Loads

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