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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第2期    总第258期    2016年2月

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文章编号:1672-7207(2016)02-0450-09
不同地应力下TBM盘形滚刀破岩特性
夏毅敏1, 2,吴才章1,顾健健1,丛国强1,唐露1,张魁1

(1. 中南大学机电工程学院,湖南长沙,410083;
2. 中南大学高性能复杂制造国家重点实验室,湖南长沙,410083
)

摘 要: 根据Mohr-Coulomb准则分析岩石强度与地应力的变化关系,对不同地应力下盘形滚刀破岩载荷模型进行修正;以锦屏二级水电站TBM掘进现场实测的数据为依据,建立有初始地应力和无初始地应力下盘形滚刀破岩仿真模型,并进行无初始应力滚刀破岩试验,研究盘形滚刀破岩载荷特性及岩石破碎特征。研究结果表明:随着地应力的增大,三向力载荷增大;在各个贯入度下,初始应力为28~36 MPa时与0 MPa时相比,垂直力和滚动力的增加幅度较大,增大幅度可达到70%以上,侧向力增加幅度最小;随着初始地应力的增加,滚刀总破岩量减少,破岩能耗上升;三向力理论计算值与仿真值吻合较好,相对误差范围在10%~21%之间;无初始应力下的破岩试验在一定程度上验证力学模型和仿真结果的正确性。

 

关键字: 地应力;盘形滚刀;力学模型;贯入度;三向力载荷

Mechanical characteristics of TBMdisc cutter under the initial stress
XIA Yimin1, 2, WU Caizhang1, GU Jianjian1, CONG Guoqiang1, TANG Lu, ZHANG Kui1

1. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;
2. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China

Abstract:According to Mohr-Coulomb strength standard, the relationship between strength of rock and initial stress was analyzed and the rock-craking load model of disc cutter in the environment of initial stress was revised. Based on the excavating condition of TBM in Jinping secondary hydropower station, the rock-breaking simulation model under initial stress or not was established and the rock-breaking experiment without initial stress was carried out to study the load characteristic of disc cutter and the rock-breaking characteristic. The results show that the three-dimensional force increases with the increase of the initial stress; at a certain penetration depth, when the initial stress is 28-36 MPa, the vertical force and rolling force increase by a bigger margin with a rate of more than 70%, and the lateral force increases by the smallest margin compared with that of 0 MPa. With the increasement of initial stress, the total quantity of cracked rock decreases, and the energy consumed in breaking rock increases. The theoretical value and the simulation value of the three-dimensional force can fit well and the relative error of three-dimensional force ranges from 10% to 21%. The rock-craking load model and the simulation results can be verifiedto some extent by the rock-breaking experiment without initial stress.

 

Key words: initial stress; disc cutter; mechanical model; penetration depth; three-dimensional force load

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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