Numerical simulation of rock fragmentation mechanisms subject to wedge penetration for TBMs

Li, X.F.; Li, H.B.; Liu, Y.Q.; Zhou, Quan; Xia, Xilin

doi:10.1016/j.tust.2015.12.010

Cited by 106 publications

(35 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results suggested that an increase in lateral confinement results in an increase in the critical depth of penetration at which the primary crack initiates. Based on laboratory tests and numerical modeling, Innaurato et al [18] pointed out that a trend of the fracture towards the free edge was frequently observed for a higher lateral confinement, which is consistent with the experimental results obtained by Cook et al [19], Liu et al [20], and Li et al [21].…”

Section: Introductionsupporting

confidence: 71%

Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures

Liu

Jiang

et al. 2017

Energies

View full text Add to dashboard Cite

Deep underground mines have high energy consumption due to the need to overcome the confining pressure. This study investigates the characteristics of the roadheader used for breaking rock containing a different number and size of holes under different confining pressures. A series of simulations were conducted using the LS-DYNA software to study the cutting torque, thrust force, specific energy, and failure mode during the rock-breaking process. Following this, the results were further validated with experimental data. It was found that the decrease in energy rates of rock containing different numbers (1, 5, 9, and 13) of holes are 12.7%, 19.3%, 25.9%, and 38.4%, respectively. Meanwhile, the decrease in energy rates of rock with different hole diameters (35, 45, 55, and 65 mm) are 10.5%, 19.3%, 24.6%, and 28.1%, respectively. Under the confining pressure of 10 MPa, the increase in the torque of the rock without holes is 23.5%, while this increase in the rock with five holes is 7.9%. This indicates that the high torque and energy consumption caused by the confining pressure can be reduced by drilling holes in the rock.

show abstract

Section: Introductionsupporting

confidence: 71%

Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures

Liu

Jiang

et al. 2017

Energies

View full text Add to dashboard Cite

show abstract

“…Each particle is in contact with the neighbouring particles via the contact model. The parallel-bond model has often been used to simulate crack initiation and propagation in rock or rock-like materials [26,[35][36][37]. However, there are several issues concerning this contact model when simulating brittle hard rock [38]: (i) an unrealistically low unconfined compressive strength to tensile strength ratio, (ii) an excessively low internal friction angle, and (iii) a linear strength envelope.…”

Section: Particle Flow Modelling Of Granite 41 Flat-joint Modelmentioning

confidence: 99%

“…Song et al [25] determined the failure position of a tunnel based on a DEM simulation and concluded that it is an efficient method to predict the instability in the rock surrounding a tunnel with a complex geological condition. Based on a novel clustered assembly approach, Li et al [26] studied the rock fragmentation mechanism and failure process induced by a wedge indenter and found that the initial void and defects existing in the model exert a significant effect on the coalescence and propagation of a median crack as well as on the stress concentration. Based on the granite rock model established by PFC2D, Tian et al [27] verified numerically that shear cracks are more difficult to initiate in coarse granite specimens than in fine granite specimens because there are less grain boundary contacts in coarse-grained materials.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the fatigue behaviour and crack evolution mechanism of granite under ultra-high-frequency loading

et al. 2020

View full text Add to dashboard Cite

Assisted ultrasonic vibration technology has received great interest in the past few years for petroleum and mining engineering related to hard rock breaking. Understanding the fatigue behaviour and damage characteristics of rock subject to ultra-high-frequency loading is vital for its application. In this research, we conducted ultrasonic vibration breaking rock experiments combined with an ultra-dynamic data receiver and strain gauges to monitor the development of strain in real time. The experimental results show that the strain curve is U-shaped, and it can be divided into three stages: the strain first decreases, then remains steady (with light fluctuations) and finally increases. The sample first underwent compressive deformation, and no rupture occurred. As the vibration continued, the compressive deformation decreased with the initiation and propagation of cracks, and fragmentation occurred. To elucidate the crack evolution mechanism of the granite specimens, numerical simulations were performed using particle flow code in two dimensions (PFC2D), and an improved fatigue damage model based on the flat-joint contact model was proposed. The numerical results indicate that this model can effectively reproduce the fatigue characteristics of hard brittle rocks under ultrasonic vibration. By analysing the stress and strain fields and cracking process, the crack evolution mechanism in the brittle hard rock under ultra-high-frequency loading is revealed. These experimental and numerical results are expected to improve the understanding of the fragmentation mechanism of rock under assisted ultrasonic vibration.

show abstract

“…erefore, based on the Huojin shield section of Chengdu Metro Line 18, the particle flow discrete element of the software FLAC3D6.0 is coupled with the finite difference FLAC3D unit, based on the displacement and stress transfer [16][17][18][19][20] and the noncontinuous sand and gravel stratum. e study on the stability of the excavation face reveals the instability mode, surface subsidence law, and minimum support pressure of the collapse and failure of the shield excavation face and compares it with the onsite monitoring data to verify the collapse of the excavation face (research on the universal law of stability influence).…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Shield Excavation Face Based on Particle Flow in Different Depths of Sandy Gravel Stratum

Jun-wei

Huang

Taixin

2019

Advances in Civil Engineering

View full text Add to dashboard Cite

The objective of this work was to study the minimum support force of the shield excavation face of sand-gravel stratum. Based on the geological conditions obtained from the exploration of the 18th line of the Chengdu Rail Transit and the shield excavation parameters obtained from excavation, particle flow DEM PFC3D and FLAC3D were used as tools; the digital triaxial compression test was performed to calibrate the mesoscopic parameters of the soil; numerical excavation models were built for deep-buried and shallow-buried sand and gravel stratum shield tunnels; surface settlement and minimum support force under different depths and different supporting forces were obtained in the end. The stability of the excavation face under the condition of 10 kPa∼60 kPa support force was analyzed; the excavation surface gradually tended to stabilize, and the surface subsidence decreased with the increase of support force. When the supporting force was greater than or equal to 3 kPa, the excavation surface was stable and the surface settlement speed gradually decreased to zero with time. While analyzing the stability of the excavation face of 5 m, 10 m, and 15 m buried deep gravel tunnels and the influence of the support force on the surface settlement, the minimum support force that did not consider the surface settlement was reduced and the minimum support force required to control the surface settlement was increased as the tunnel depth decreased. Using this method, the depth of the excavation sand-gravel tunnel and the support of the excavation face could be obtained to meet the requirements of surface subsidence control and the economic benefits of the project could be improved.

show abstract

Numerical simulation of rock fragmentation mechanisms subject to wedge penetration for TBMs

Cited by 106 publications

References 32 publications

Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures

Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures

Experimental and numerical investigation of the fatigue behaviour and crack evolution mechanism of granite under ultra-high-frequency loading

Stability Analysis of Shield Excavation Face Based on Particle Flow in Different Depths of Sandy Gravel Stratum

Contact Info

Product

Resources

About