高应力条件下TBM破岩岩渣块度分布规律研究  

On the Fragmentation Distribution of Rock Fragments in TBM Excavation under High Confining Stress Condition

作　　者：李武 严鹏[1,2] LI Wu;YAN Peng(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072

出　　处：《水电与新能源》2023年第4期33-36,共4页Hydropower and New Energy

摘　　要：TBM掘进过程产生的岩石渣料包含丰富的地质信息,为研究地应力对TBM掘进过程产生的岩石渣料的影响,采用PFC2D建立了围压条件下的滚刀破岩模型,提取并分析破岩产生的岩石碎片。数值模拟结果表明:TBM滚刀掘进过程主要产生扁平形岩石碎片。在一定范围内,随着围压增加,岩石碎片的平均粒径呈“W”形变化,并且小粒径碎片的含量增加,但围压较高(>30 MPa)时,反而更容易形成较大粒径的岩石碎片。The rock fragments produced in TBM excavation contains rick geological information.In order to study the effect of the in-situ stress on rock fragments produced in TBM excavation,a rock breaking model with TBM hobbing cutter under confining stress conditions is constructed in PFC2D software,and the rock fragments produced by the breaking process are extracted and analyzed.The numerical simulation results show that the TBM cutter excavation process mainly produces flat frock fragments.Within certain range of the confining stress,the average fragmentation size of the rock fragments changes in a“W”shape with the increase of the confining stress,and the content of small size fragments increases.While,when the confining stress is higher(>30 MPa),it is easier to produce rock fragments with larger sizes.

关 键 词：TBM滚刀 围压 岩渣 

分 类 号：U455.6[建筑科学—桥梁与隧道工程]