预切槽和TBM机械滚刀的新型联合破岩模式研究  

Research on combined rock-breaking mode of pre-cutting groove and TBM mechanical cutter

作　　者：徐福通 卢景景[1,2] 周辉 肖建成[1,2] 张传庆 邱浩权 XU Fu-tong;LU Jing-jing;ZHOU Hui;XIAO Jian-cheng;ZHANG Chuan-qing;QIU Hao-quan(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing,100049,China;College of Civil Engineering,Hubei University of Technology,Wuhan,Hubei 430068,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049 [3]湖北工业大学土木建筑与环境学院,湖北武汉430068

出　　处：《岩土力学》2021年第5期1363-1372,共10页Rock and Soil Mechanics

基　　金：中国科学院基础前沿科学研究计划(No.ZDBS-LY-DQC022);国家自然科学基金专项项目资助(No.41941018);湖北省自然科学基金创新群体(No.2018CFA013)。

摘　　要：传统机械-岩体相互作用的破岩模式已经无法大幅提升隧道掘进机(tunnel boring machine,简称TBM)的掘进效率,新型破岩技术及其破岩机制逐渐被重视。在不改变现有TBM主体结构的前提下,通过开展3种不同岩性有无预切槽试样在侧向约束条件下的TBM常截面滚刀压头贯入试验,研究预切槽对TBM机械滚刀破岩效果的影响规律,结果表明:(1)预切槽可降低岩样破碎时压头的法向荷载,与不切槽相比,有预切槽的岩样破碎时法向荷载降低44.13%~53.05%,岩石单轴抗压强度越低,法向荷载降低比例越大;(2)预切槽深度对岩样破碎时法向荷载的影响存在临界值,超过临界值后,预切槽深度对岩样破坏行为影响减弱。基于此,提出了预切槽+TBM机械滚刀破岩的新型联合破岩模式,并探讨了可实现预切槽的新型破岩技术。联合破岩模式能够突破破岩效率瓶颈,对TBM装备升级和重大工程项目建设具有重要意义。The traditional rock-breaking mode of mechanical-rock interaction can no meet the requirement of large improvement of tunneling efficiency of TBM.Innovative rock-breaking technology and its rock-breaking mechanism have gradually been paid more and more attention.On the premise of not changing the main structure of TBM,the penetration test using TBM constant cross-section hob indenter has been carried out on rock samples with three different lithology under lateral constraint conditions.The influence of pre-cutting groove on rock-breaking mode of mechanical cutter are studied.The results show that:(1)Pre-cutting groove can reduce the normal load of indenter when the rock sample is broken,and the normal load of the rock sample with pre-cutting groove is reduced by 44.13%-53.05%compared with that without groove.The lower the uniaxial compressive strength of the rock is,the larger the reduction ratio of normal load will be.(2)There is a critical value for the influence of pre-cutting groove depth on the normal load when the rock sample is broken.Beyond this critical value,the influence of pre-cutting groove depth on the failure behavior of the rock sample is weakened.Based on the above investigations,a new combined rock-breaking mode of pre-cutting groove and mechanical cutter is proposed,and an innovative rock breaking technology that can realize pre-cutting groove is discussed.The combined rock-breaking mode can break through the bottleneck of rock-breaking efficiency and is of great significance for TBM equipment upgrading and major engineering project construction.

关 键 词：预切槽 TBM机械滚刀 破岩模式 破岩技术 联合破岩 

分 类 号：TU452[建筑科学—岩土工程] P634.1[建筑科学—土工工程]