Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

Guo, Zhenggang; Lv, Shuai; Wang, Juan; Xu, Zhipeng

doi:10.18280/ijsse.100103

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…A tunnel boring machine (short for TBM) is a rock crushing machine, with continuous operation of slagging and supporting integrated. It is developed from shield tunneling technology [4][5][6][7]. The modern shield machine is integrated with mechanical, electrical, hydraulic, sensing and information technology, with functions of cutting soil, transporting soil ballast, assembled tunnel lining, measuring, orientation and rectification.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Electro-Hydraulic Thrust System of TBM Based on Fuzzy PID Controller

Gong

Chen

et al. 2022

Energies

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The tunnel boring machine (TBM) is widely used in tunnel construction projects. The thrust system plays a crucial role to drive the machine ahead and support gripper shoes stably while tunneling. More and more attention has been paid to the pressure and velocity regulation efficiency as the TBM advances in complex rock conditions to ensure the stabilization of the tunneling process. A thrust hydraulic control system, assembled with a proportional pressure reducing valve, is established with system operating parameters. The mathematical model of the thrust electro-hydraulic system is revealed. To improve the control characteristics of the thrust system, a self-tuning fuzzy PID controller is introduced in the pressure and velocity regulation procedures. After that, tests on a Φ2.5 m scaled TBM test rig are carried out. The test results show that the thrust system adopting the fuzzy PID controller results in less oscillation and a smoother regulation process. It takes less time to reach the target goal of pressure regulation with less vibration during the pressure regenerating periods, and both systems of conventional PID controller and fuzzy PID controller are qualified in velocity regulation movements. The proposed control methods show better benefits in reduction of vibrations and shorter time of regulation to stable conditions, which extends the machine’s life and affects the acceleration of the tunneling process.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Electro-Hydraulic Thrust System of TBM Based on Fuzzy PID Controller

Gong

Chen

et al. 2022

Energies

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“…With a simple structure, the machine can be assembly easily and supports rapid excavation. These advantages have made it a hot topic in the research of the rapid construction of rescue channels in collapsed coalmines [5]. When the pipe jacking machine advances in the coal rock formation, the spinning cutter-head drives the disc cutter to break the coal rock.…”

Section: Introductionmentioning

confidence: 99%

Rock Breaking Performance of Two Disc Cutters of Tunnel Boring Machine for Safe Tunneling in Unstable Coal Rock Stratum

Guo¹,

Wang²,

Lv³

et al. 2020

IJSSE

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In unstable coal rock formations, the rescue channels should be constructed through safe and efficient tunneling. The rock breaking performance of the tunneling equipment directly hinges on the cutter-head layout. Focusing on the conditions of unstable coal rock formation, this paper adopts the extended Drucker-Prager (D-P) plastic model to define the properties of bedrock materials of the coal rock with low mechanical strength and poor homogeneity. Then, a finite-element model was established on ABAQUS for the coal rock cut by two disc cutters, and used to simulate the breaking of the coal rock and the peeling of slags from the bedrock. On this basis, the authors analyzed the influence of cutter spacing (30, 35, 40, and 45mm) over cutting force, rock breaking amount, and specific energy under two cutting methods: simultaneous cutting and sequential cutting. Finally, a cutter deployment strategy was designed for safe and efficient tunneling in unstable coal rock formations. The results show that: Under simultaneous cutting, as the cutter spacing increased from 30 to 35mm, the rock breaking amount increased, while the specific energy declined; as the cutter spacing further rose from 35 to 45mm, the rock breaking amount dropped, while the specific energy increased. Under the coal rock conditions in our research, the optimal cutter deployment strategy is: simultaneous cutting with cutter spacing of 35mm. The research results provide theoretical support for the cutter-head design of rescue equipment for collapsed coalmines.

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“…Therefore, PJM achieves better tunneling safety than other tunneling machines [9]. Currently, PJM development has become a hotspot in the field of underground coalmine rescue [10].…”

Section: Introductionmentioning

confidence: 99%

Discrete- and Finite-Element Analysis on the Tunneling Safety of Pipe Jacking Machine in Coal Rock Formation

Gao¹,

Lv²,

Chang-yuan³

et al. 2020

IJHT

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During pipe jacking in unstable coal rock formation, it is difficult to ensure the stability of the workface and the structural safety of the equipment. To solve the problem, this paper establishes a numerical model for the rock-breaking and slag discharge of pipe jacking machine (PJM) with different tunneling parameters, and numerically analyzes the variations in the flow rate and speed of slags, and the stress and deformation of cutterhead, at different cutterhead speeds (1.0-4.0r/min) and jacking speeds (0.5-4.0mm/s). Based on the simulation results, the authors discussed how different tunneling parameters affect the tunneling safety. The simulation results highlight the importance of the matching between cutterhead speed and jacking speed to tunneling safety. As the jacking speed increased, the load of the cutterhead increased significantly, which may cause the cutter to wear. At the jacking speed of 4.0mm/s, the equivalent stress and deformation of cutterhead peaked at 397.43MPa, and 10.73mm, respectively. Excessive jacking speed may result in accidents, such as deformation and structural fracture of cutterhead, posing a serious threat to the structural safety of cutterhead. As the cutterhead speed increased from 1.0r/min to 4.0r/min, the mean axial speed of slags dropped by 68%, and the slag flow rate declined by 76%, due to the rapid discharge of slags from the cabin. In this case, the slag volume in the cabin cannot provide sufficient support to the workface rock, and the risk of collapse soars during the tunneling in unstable formation. In addition, an excessive cutterhead speed increased tunneling energy consumption and aggravated the wear of the cutterhead. The research results promote the setting of control parameters for the safe pipe jacking in unstable coal rock formation.

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Rock-Breaking Performance of Cutters of Tunnel Boring Machine in Broken Coal Rock Formation

Cited by 6 publications

References 23 publications

Performance Analysis of Electro-Hydraulic Thrust System of TBM Based on Fuzzy PID Controller

Performance Analysis of Electro-Hydraulic Thrust System of TBM Based on Fuzzy PID Controller

Rock Breaking Performance of Two Disc Cutters of Tunnel Boring Machine for Safe Tunneling in Unstable Coal Rock Stratum

Discrete- and Finite-Element Analysis on the Tunneling Safety of Pipe Jacking Machine in Coal Rock Formation

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