Physical and numerical studies of rock fragmentation subject to wedge cutter indentation in the mixed ground
•The simulation and lab tests results are generally comparable under single cutter.•Asymmetric cutter forces and failure pattern induced in mixed ground indentation.•The penetration rate should be slowed down in mixed ground to prevent cutter damage. To study the effects of the mixed ground conditio...
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| Published in | Tunnelling and underground space technology Vol. 71; pp. 354 - 365 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Oxford
Elsevier Ltd
01.01.2018
Elsevier BV |
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| Online Access | Get full text |
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| Abstract | •The simulation and lab tests results are generally comparable under single cutter.•Asymmetric cutter forces and failure pattern induced in mixed ground indentation.•The penetration rate should be slowed down in mixed ground to prevent cutter damage.
To study the effects of the mixed ground conditions on the cutter force and failure pattern during the tunnel boring machine (TBM) excavation, rock cutting tests under wedge cutter are conducted both in the physical experiments and the bonded particle model (BPM) numerical simulations. The results of simulation are generally comparable with those of experiments under single cutter. It demonstrates that the softer bottom material causes more disperse stress distribution which leads to wider AE accumulated area and more rapid displacement change in the indentation direction. Further simulations are conducted under double cutters. Crack may propagate deeper into the specimen due to the weaker bottom material. When the inclination of the material interface changes, the failure pattern of the specimen becomes highly asymmetric and the forces of the two cutters are not equal any more. Frequent change of ground conditions causes high asymmetric cutter force distribution, frequent changing cutter force as well as high eccentric moments on the cutter head. |
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| AbstractList | •The simulation and lab tests results are generally comparable under single cutter.•Asymmetric cutter forces and failure pattern induced in mixed ground indentation.•The penetration rate should be slowed down in mixed ground to prevent cutter damage.
To study the effects of the mixed ground conditions on the cutter force and failure pattern during the tunnel boring machine (TBM) excavation, rock cutting tests under wedge cutter are conducted both in the physical experiments and the bonded particle model (BPM) numerical simulations. The results of simulation are generally comparable with those of experiments under single cutter. It demonstrates that the softer bottom material causes more disperse stress distribution which leads to wider AE accumulated area and more rapid displacement change in the indentation direction. Further simulations are conducted under double cutters. Crack may propagate deeper into the specimen due to the weaker bottom material. When the inclination of the material interface changes, the failure pattern of the specimen becomes highly asymmetric and the forces of the two cutters are not equal any more. Frequent change of ground conditions causes high asymmetric cutter force distribution, frequent changing cutter force as well as high eccentric moments on the cutter head. To study the effects of the mixed ground conditions on the cutter force and failure pattern during the tunnel boring machine (TBM) excavation, rock cutting tests under wedge cutter are conducted both in the physical experiments and the bonded particle model (BPM) numerical simulations. The results of simulation are generally comparable with those of experiments under single cutter. It demonstrates that the softer bottom material causes more disperse stress distribution which leads to wider AE accumulated area and more rapid displacement change in the indentation direction. Further simulations are conducted under double cutters. Crack may propagate deeper into the specimen due to the weaker bottom material. When the inclination of the material interface changes, the failure pattern of the specimen becomes highly asymmetric and the forces of the two cutters are not equal any more. Frequent change of ground conditions causes high asymmetric cutter force distribution, frequent changing cutter force as well as high eccentric moments on the cutter head. |
| Author | Zhang, Qi Peng, Zhi-Hao Ji, Pei-Qi Liu, Quan-sheng Zhang, Xiao-Ping Liu, Qi |
| Author_xml | – sequence: 1 givenname: Xiao-Ping surname: Zhang fullname: Zhang, Xiao-Ping email: jxhkzhang@163.com – sequence: 2 givenname: Pei-Qi surname: Ji fullname: Ji, Pei-Qi – sequence: 3 givenname: Quan-sheng surname: Liu fullname: Liu, Quan-sheng – sequence: 4 givenname: Qi surname: Liu fullname: Liu, Qi – sequence: 5 givenname: Qi surname: Zhang fullname: Zhang, Qi – sequence: 6 givenname: Zhi-Hao surname: Peng fullname: Peng, Zhi-Hao |
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| Snippet | •The simulation and lab tests results are generally comparable under single cutter.•Asymmetric cutter forces and failure pattern induced in mixed ground... To study the effects of the mixed ground conditions on the cutter force and failure pattern during the tunnel boring machine (TBM) excavation, rock cutting... |
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| SubjectTerms | Boring machines BPM Computer simulation Cutters Excavation Force distribution Inclination Indentation Machine tools Mathematical models Mixed ground Rock fragmentation Simulation Skewed distributions Stress concentration Stress distribution TBM Tunnels Wedge cutter Wedges |
| Title | Physical and numerical studies of rock fragmentation subject to wedge cutter indentation in the mixed ground |
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