| DENG Yu,ZHANG Meng-qi,MO Ji-liang,ZHOU Zhong-rong.Contact Behavior of TBM Cutters with Different Profiles in Composite Stratum[J],52(8):329-339 |
| Contact Behavior of TBM Cutters with Different Profiles in Composite Stratum |
| Received:October 11, 2022 Revised:February 09, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.08.027 |
| KeyWord:s, 1965, 2(1):1-12. |
| Author | Institution |
| DENG Yu |
Tribology Research Institute, School of Mechanical Engineering,Tribological Design Laboratory of Shield/TBM Equipment, Southwest Jiaotong University, Chengdu , China |
| ZHANG Meng-qi |
Tribology Research Institute, School of Mechanical Engineering,Tribological Design Laboratory of Shield/TBM Equipment, Southwest Jiaotong University, Chengdu , China |
| MO Ji-liang |
Tribology Research Institute, School of Mechanical Engineering,Tribological Design Laboratory of Shield/TBM Equipment, Southwest Jiaotong University, Chengdu , China |
| ZHOU Zhong-rong |
Tribology Research Institute, School of Mechanical Engineering,Tribological Design Laboratory of Shield/TBM Equipment, Southwest Jiaotong University, Chengdu , China |
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| Abstract: |
| Composite stratum is one of the common geological conditions in tunnel construction. When working in composite stratum, the load of cutters is changed greatly, which makes cutters or cutter head more prone to damage. The cross-section profile of cutter has a key effect on its comprehensive performance. It is of great significance to study the load variation characteristics of the cutters with different cross-section profiles, and to obtain the advantages and disadvantages of various cutters applied to composite stratum, so as to reduce the abnormal damage of cutter and the offset load of cutter head. In this work, nine groups of experiments were designed to study the performance of cutters with three cross-section profiles at three invasion depths. Through the rock cutting experiments, the cutting force and rock fragment volume of three cutters (flat-top, circular-top and spiral groove cutter) applied in the soft and hard composite stratum were obtained and compared. ANSYS and LSDYNA software were used for joint simulation to establish the finite element numerical model of rock breaking with a single cutter, elastic plastic model was used for cutter, JHC model was used for rock, and erosion contact algorithm was used to simulate the contact behavior of cutter and rock. This model was used to explore the mechanism of the effects of cutter profile on rock cutting efficiency. The results indicated that in the composite stratum, the average normal force required by flat-top cutter was the highest, and the average normal forces of other cutters were similar. This was because for the circular-top cutter and spiral groove cutter, only part of the surface was involved in contact with rock, and the contact area of these two cutters was smaller than that of flat-top cutter, so the stress concentration effect was stronger, leading to a lower normal force required to break the rock. The difference of normal force of the spiral groove cutter was the smallest in cutting rock with different strength, which indicated that the use of this type of cutter could reduce the uneven distribution of the load of the cutter head in the composite stratum. The standard deviation of normal force of circular-top cutter was the smallest, namely that the degree of load fluctuation was the lowest. Powder and rock chips were formed by all three cutters. In general, at the same single invasion depth, the difference of rock breaking performance of the three cutters is not obvious, the total volumes of rock fragments formed by flat-top and circular-top cutters are similar, while that of spiral groove cutter is slightly lower. When the strength of soft and hard rocks in the composite stratum varies greatly, the spiral grooving cutter is recommended to reduce the unbalanced load of the cutter head. When the strength of the hard rocks is high, it is recommended to use a circular-top cutter, which can effectively reduce the impact of load. |
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