基于MatDEM的盾构滚刀破岩离散元建模与数值模拟

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摘要滚刀与岩体间的相互作用是TBM技术的核心,数值模拟是研究这一过程的重要手段。基于岩土体离散元软件MatDEM进行二次开发,构建包含50.2万单元的软硬互层岩层模型和盾构滚刀模型,对滚刀破岩过程进行模拟计算,记录并分析模拟中边界及滚刀受力、颗粒连接、能量转化、热量分布等信息。结果表明:硬质岩层内边界及滚刀受力变化明显,刀盘垂向及层面垂向单元受力较大;软质岩层内边界及滚刀受力较小,滚刀受力均匀;硬质岩层内颗粒连接断裂数较软质岩层少,岩体切削量也较小;硬质岩层内系统能量变幅较大,系统能量主要以摩擦热形式存在。MatDEM有效地模拟了滚刀破岩过程,通过修改滚刀形态和岩石性质等,本算例可用于各类工况滚刀破岩研究中,为大规模滚刀破岩数值模拟提供一个新的途径。

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	梁立唯
	刘春
	秦岩
	朱晨光
	邓尚

关键词: 滚刀破岩离散元 MatDEM 能量复合岩层

Abstract: The interaction between the hob and the rock mass is the core of TBM technology, and numerical simulation plays an important role in studying this process. In this paper, a hob and a soft-strong inter-bedded rock model was built based on further development of discrete element software MatDEM, which contained 502 thousand particles. By simulating the process of the rock breaking by a hob, as well as recording and analyzing, including boundary and hob force, particle connection, energy conversion, heat distribution and so on. The simulation results showed that, when strong rock breaked, the force of boundary and hob changing obviously, and the particles had greater force in the direction perpendicular to the hob and layer, but when weak rock layer was breaking, the inner boundary and the hob bore less stress, and the force of the hob was uniform; There were a few of broken joints in strong rock layer, and breaking volume of rock mass was small; During this process a lot of frictional heat was produced, and the accumulate of energy in strong rock was larger. MatDEM could simulate rock breaking process by hob effectively. By modifying the shape of hob and parameter of rock, this method could be further used for simulation of large-scale rock breaking by hob in other engineering conditions. It also provided a new way for numerical simulation of large-scale hob breaking rock.

Key words: rock breaking by hob discrete element method MatDEM energy composite rock model

收稿日期: 2018-09-17 出版日期: 2019-09-20 发布日期: 2019-11-13 期的出版日期: 2019-09-20

中图分类号:

TU94+1

基金资助: 国家自然科学基金资助项目(41761134089);江苏省自然科学基金青年资助项目(BK20170393);青岛海洋科学与技术国家实验室开放基金资助项目(QNLM2016ORP0110)

通讯作者: 刘春(1984— ),男,福建顺昌人,博士,副教授,硕士生导师,主要研究方向为计算工程地质. E-mail: chunliu@nju.edu.cn

作者简介: 梁立唯(1993— ),男,黑龙江大庆人,硕士研究生,主要研究方向为岩土体离散元数值模拟. E-mail:njulw29015@163.com. *通信作者:刘春(1984— ),男,福建顺昌人,博士,副教授,硕士生导师,主要研究方向为计算工程地质. E-mail: chunliu@nju.edu.cn

引用本文:

梁立唯, 刘春, 秦岩, 朱晨光, 邓尚. 基于MatDEM的盾构滚刀破岩离散元建模与数值模拟[J]. 隧道与地下工程灾害防治, 2019, 1(3): 116-122.
LIANG Liwei, LIU Chun, QIN Yan, ZHU Chenguang, DENG Shang. Discrete element modeling and numerical simulation of rock breaking by hob based on MatDEM. Hazard Control in Tunnelling and Underground Engineering, 2019, 1(3): 116-122.

链接本文:

http://tunnel.sdujournals.com/CN/Y2019/V1/I3/116

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