Numerical simulation on interaction stress analysis of rock with conical picks

Li, H.S.; Liu, S.Y.; Xu, Peng

doi:10.1016/j.tust.2018.12.014

Cited by 45 publications

(23 citation statements)

References 34 publications

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“…e numerical model in this paper adopted the above-described geometric model, mesh model, and boundary conditions unless otherwise stated. [2]. To study the stress field and dynamic fracture of a rock specimen, the Johnson-Holmquist constitutive model (JH2) is used.…”

Section: Geometric Model and Boundariesmentioning

confidence: 99%

“…is model was originally formulated for a description of the brittle response of ceramics and has also been widely used to simulate the dynamic behavior of brittle or quasibrittle materials, such as rock, concrete, glass, and ice [32][33][34][35]. [2]. e polynomial equation of state (EOS), which is commonly used with the JH2 model, was used for the rock specimen.…”

Section: Geometric Model and Boundariesmentioning

confidence: 99%

“…where K 1 , K 2 , and K 3 are the material parameters to be obtained from the experiments. [2]. e JH2 model consists of the strength models of intact, damaged, and fractured materials.…”

Section: Equation Of State For Rockmentioning

confidence: 99%

“…3.2.3. JH2 Failure Criterion [2]. In the JH2 model, the yield and failure surfaces coincide at any point in time.…”

Section: Shock and Vibrationmentioning

confidence: 99%

“…However, due to restriction of construction equipment, the extent of rock roadway is only around 60 m per month, which seriously restricts the coordinated development of coal mine production. For hard rock with a hardness coefficient f ≥ 10, regardless of the use of a full-face tunnel boring machine or roadheader, the impact and friction of the pick is increases, and the working environment of the roadheader is worse, reducing the effectiveness of the tunneling machine and increasing the cost of a hard rock roadway [2,3]. us, a new method of rock breaking using a hydraulic splitter is proposed to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Rock‐Fracturing Mechanism by Using Splitter under Hole Assistance

Liu

Guo

2019

Shock and Vibration

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In this work, a numerical model of rock breaking under hole assistance was established based on the finite element method (FEM) coupling with smoothed particle hydrodynamics (SPH) to reveal rock-breaking mechanisms and analyze the reasons for crack formation and propagation under hole assistance. In addition, the numerical model was verified by experiment with and without a hole, and the simulation results are basically consistent with the experimental results in rock breaking. During the process of rock fracturing, the hydraulic splitter was first inserted into the predrilling hole, and then the wedges were pushed into the rock under the action of the hydraulic pressure. In this process, the splitter wedge was separated from the two sides, and the transverse bursting force was transmitted to the rock. Finally, the main fracture formed and the rock mass broke due to the bursting force. The results show that the cracks propagate along the approximately straight lines OO1 (the distance between the auxiliary holes and the left predrilled fracturing hole) and OO2 (the distance between the auxiliary holes and the right predrilled fracturing hole) before extending to the auxiliary hole which is unlike the crack propagation in rock without auxiliary holes, and the crack propagating direction gradually approaches horizontally and is vertical to the side after passing through the auxiliary holes. Moreover, when the auxiliary holes are located at the prefabricated angles α = 40° and 45°, the crack propagation can be well induced and the cracks pass through the auxiliary holes. However, at α = 50°, the auxiliary holes can no longer well induce the crack propagation in the process of rock breaking; however, the fracturing pressure is still less than that with no auxiliary holes, indicating that the auxiliary holes play a positive role in guiding rock breaking.

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Section: Geometric Model and Boundariesmentioning

confidence: 99%

Section: Geometric Model and Boundariesmentioning

confidence: 99%

“…where K 1 , K 2 , and K 3 are the material parameters to be obtained from the experiments. [2]. e JH2 model consists of the strength models of intact, damaged, and fractured materials.…”

Section: Equation Of State For Rockmentioning

confidence: 99%

“…3.2.3. JH2 Failure Criterion [2]. In the JH2 model, the yield and failure surfaces coincide at any point in time.…”

Section: Shock and Vibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Rock‐Fracturing Mechanism by Using Splitter under Hole Assistance

Liu

Guo

2019

Shock and Vibration

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Numerical simulation of the influence of pillar strength on the internal synergy relationship in the backfill‐pillar system

Sun

Feng

et al. 2021

Num Anal Meth Geomechanics

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The influence of the strength of the pillar on the bearing characteristics of the backfill‐pillar system (BPS) based on the mechanism of backfill. Quantitative synergy relationships between backfill and pillar were defined and pointed out. There are four kinds of quantitative synergy relationships in the bearing process of the system. To verify the relationship, systems with different strengths of the pillar were selected to carry out numerical simulation experiments, and a mathematical calculation method to quantify synergy relationship in the BPS was designed. The results show that the system under the low strength of the pillar presents the overall increase in bearing characteristics, while the system under the high strength of the pillar presents “N”‐type bearing features. Four kinds of quantitative synergy relationships able to characterise the action mechanism between backfill and pillar in each stage of the bearing of the system. Through analysis and discussion, it was concluded that the essential reason for the difference in bearing characteristics is that the effect of displacement restraint, joint support, and passive compressive weaken with the increase of the strength of pillar. The effect of pillar strength on the internal synergy of BPS is well verified by numerical simulation test.

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Mean Cutting Force Prediction of Conical Picks Using Ensemble Learning Paradigm

Fathipour‐Azar

2022

Rock Mech Rock Eng

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Numerical simulation on interaction stress analysis of rock with conical picks

Cited by 45 publications

References 34 publications

Numerical Investigation on Rock‐Fracturing Mechanism by Using Splitter under Hole Assistance

Numerical Investigation on Rock‐Fracturing Mechanism by Using Splitter under Hole Assistance

Numerical simulation of the influence of pillar strength on the internal synergy relationship in the backfill‐pillar system

Mean Cutting Force Prediction of Conical Picks Using Ensemble Learning Paradigm

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