The influence of intermittent joint on rock fragmentation by TBM cutter
[1]Zhai Shufang,Cao Shihao,Feng Yong,et al.The influence of intermittent joint on rock fragmentation by TBM cutter[J].Journal of Zhengzhou University (Engineering Science),2020,41(01):20-24.[doi:10.13705/j.issn.1671-6833.2019.04.001]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
41
Number of periods:
2020 01
Page number:
20-24
Column:
Public date:
2020-03-10
- Title:
- The influence of intermittent joint on rock fragmentation by TBM cutter
- CLC:
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- Abstract:
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A new meshfree numerical method, which is known as general particle dynamics (GPD) , is introduced to investigate the process of rock fragmentation by TBM cutter. The effects of inclination angle and length of intermittent joint on the pattern and efficiency of rock fragmentation have been studied. T he conclusions are summarized as follows : ①The initiation patterns of crack at intermittent joint are classified into three types: the crack is initiated at the centre of joint and propagates upward s the crack is initiated from the lower tip of joint and propagates downward s the crack is initiated from the upper tip of joint and propagates upward s ②The length of median cracks and the depth of rock fragmentation are related to the endpoints of intermittent joint. When the location of endpoints is more close to the loading surface and loading point, the madian cracks and the depth of rock fragmentation are more obviously restrain.③The depth of rock fragmentation decreases with increasing the intermittent joint length, and the depth of rock fragmentation remains constant when the length of joint is greater than a critical value.④Relationship between cutter cut rate and the length of joint can be expressed by ，which P75°
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Last Update:
2020-02-22
