Evaluation of saturation effects on drag pick cutting of a brittle sandstone from full scale linear cutting tests

Bakar, M. Z. Abu; Gertsch, Leslie S.

doi:10.1016/j.tust.2012.11.009

Cited by 59 publications

(16 citation statements)

References 15 publications

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“…The optimum ratio of cutting spacing to cutting depth (S/D) is the dimensionless ratio at which the cutting operation gives the minimum specific energy values. Bakar and Gertsch [15] pointed out that the optimal S/D of a pointed tool is between 1.5 and 3. Balci and Bilgin [26] noted that the optimal S/D of a drag cutter is between 1 and 5.…”

Section: Influence Of Cutting Spacing/cutting Depth On Specific Energmentioning

confidence: 99%

“…Zhang et al [14] performed a series of rock cutting tests by disc cutter considering the effect of free surface. Baker and Gertsch [15] conducted the rock cutting tests under water by the drag cutter of the shield, and studied the cutter force and cutting efficiency. Xia et al [16] investigated the cutting force of the drag cutter under different cutting parameters based on the rotary cutting machine.…”

Section: Introductionmentioning

confidence: 99%

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Cutting Characteristics and Layout of Pre-cutting Machine Cutter

Zhang

Xia

et al. 2020

Period. Polytech. Civil Eng.

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The pre-cutting machine is becoming valued due to its ability to effectively prevent surface settlement and reduce vibration in tunnel construction. To obtain the cutting characteristics and layout of pre-cutting machine cutter, the cutting tests by the pre-cutting machine cutter are conducted and the cutting laws are also studied. The research results show that the cutting force rather than normal force and side force is responsible for the rock breaking. With the increase of the cutting depth and cutting spacing, the cutting forces increase generally. But for the little value of cutting spacing, the cutting force can not increase continuously when the cutting depth increase to a relatively large value. Furthermore, for a given cutting depth, the cutting force will keep at an approximate constant rather than continuous increase with the increase of the cutting spacing when the cutting spacing increases to a relatively large value. The specific energy decreases nonlinearly with the increase of cutting depth and the decrease of specific energy is not significant when the cutting depth is more than 12 mm. Moreover, there exists an optimal cutting spacing for a given cutting depth. To maintain a desirable cutting efficiency, the ratio of cutting spacing to cutting depth should be controlled between 1 and 2. Finally, the layout plan of the pre-cutting machine cutter is proposed based on the research results and is applied in the actual manufacturing of the pre-cutting machine.

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Section: Influence Of Cutting Spacing/cutting Depth On Specific Energmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cutting Characteristics and Layout of Pre-cutting Machine Cutter

Zhang

Xia

et al. 2020

Period. Polytech. Civil Eng.

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“…Taking the fault data of the shearer in an Iranian coal mine as the example, the reliability of each subsystem was modeled using the homogeneous Poisson process and the nonhomogeneous Poisson process, and the test was repeated. In 2013, Abu Bakar and Gertsch [14] carried out a cutting test on two types of coal and rock under both dry and wet conditions and obtained the axial cutting resistance and radial cutting resistance of the cutting teeth during the cutting of the rock. In 2014, Reid et al [15] proposed a method of indirectly identifying the force dynamics of the cutting teeth by using the extended Kalman filter, and they verified the correctness of the method by numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Dynamic Transmission Law of Spiral Drum Cutting Coal Rock Based on ANSYS/LS‐DYNA Simulation

2019

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The ANSYS/LS-DYNA software has been used in this paper to establish the coal rock coupling model. A dynamic simulation of the cutting process was used to analyze the variation of the load. Based on the dynamic analysis of the coal and rock that were cut by the spiral drum, the stress cloud diagram of the coupled model of the spiral drum and the coal and the plastic domain evolution law of the coal and the rock were obtained from the coal to the rock. The time history curves of the parameters, such as the stress and strain of the drum and the pick, were obtained, and the stress distribution of the spiral drum during the working process was ascertained. The results showed that when the spiral drum cuts the interface between the coal and the rock, the coal and the rock collapsed and the working load fluctuated. Changing the traction speed in order to change the rotational speed of the drum had a more obvious effect on the load and the stress on the drum. Through the use of simulation, the stress distribution cloud diagram of the drum was obtained. The study has shown that the stress on the end plate was significantly higher than that on the cutting blade. The maximum stress acting on the alloy head was 1209.26 MPa. This study has provided a basis for the design and optimization of the drum with regard to reliability.

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“…Firstly, how to reduce the resistance of rock to the pick must be taken into consideration [2,3]. Many studies have been conducted on researching the cutting force [4,5] and even the forces in three orthogonal directions [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of rock breaking by pick assisted with water jet of different modes

Liu

2015

J Mech Sci Technol

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In the rock breaking progress, the resistant force results in tools failure and the low cutting efficiency, thus, it is necessary to reduce the failure of tools and enhance the efficiency of cutting and drilling. In this paper, different configuration modes of water jet were presented to solve this issue. Moreover, the symmetrical pre-split finite element models for rock breaking by pick without water jet and picks assisted with different configuration modes of water jet were established to analyze the effect of different configuration modes on rock stress distribution and pick cutting forces. Finally, the experiments were conducted to validate the theory analysis. The results indicate that the cutting force decreasing rate of JCP is maximum all the time under the same conditions compared with the decreasing rate of JSP and JFP; and the numerical results were consistent with the numerical, which verifies the correctness of theory analysis.

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Evaluation of saturation effects on drag pick cutting of a brittle sandstone from full scale linear cutting tests

Cited by 59 publications

References 15 publications

Cutting Characteristics and Layout of Pre-cutting Machine Cutter

Cutting Characteristics and Layout of Pre-cutting Machine Cutter

A Study on the Dynamic Transmission Law of Spiral Drum Cutting Coal Rock Based on ANSYS/LS‐DYNA Simulation

Mechanism of rock breaking by pick assisted with water jet of different modes

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