基于小孔应力集中的激光预钻孔条件下TBM滚刀侵岩模型建模与试验验证  

Model for penetration of the TBM disc cutter under laser pre-drilling based on stress concentration in a circular hole and its test verification

作　　者：张魁 陈振宇[2] 杨长 郑学军[2] 张旭辉 ZHANG Kui;CHEN Zhenyu;YANG Chang;ZHENG Xuejun;ZHANG Xuhui(Mechanics Postdoctoral Research Mobile Station,College of Mechanical Engineering and Mechanics,Xiangtan University,Xiangtan 411105,China;Engineering Research Center of Complex Track Processing Technology&Equipment,Xiangtan University,Xiangtan 411105,China;College of Engineering and Design,Hunan Normal University,Changsha 410081,China)

机构地区：[1]湘潭大学机械工程与力学学院力学博士后科研流动站,湖南湘潭411105 [2]湘潭大学复杂轨迹加工工艺及装备教育部工程研究中心,湖南湘潭411105 [3]湖南师范大学工程与设计学院,湖南长沙410081

出　　处：《岩土工程学报》2024年第6期1279-1288,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51704256,52005179,11832016);湖南省自然科学基金面上项目(2023JJ30589);湖南省科技创新计划资助项目(2021RC2094);国家重点研发计划项目(2021YFB4000800);合肥通用机械研究院有限公司项目(2021ZKKF043);湖南省教育厅优秀青年项目(22B0127)。

摘　　要：激光发生器耦合安装到全断面岩石隧道掘进机(TBM)刀盘上,利用高能量激光辅助TBM掘进作业,理论上有望达到新型热-机械高效破岩之目的。针对激光辅助滚刀破岩,基于小孔应力集中理论的弹性应力状态计算方法,在空腔膨胀模型基础上,建立了一种考虑密实核衍生效应的激光预钻孔条件下滚刀侵岩理论模型,并对模型进行理论分析;随后开展双侧围压下的激光辅助缩尺比例滚刀侵岩试验,对理论模型进行试验验证。研究结果表明,刃宽及孔距均对侵岩垂直力有一定影响,且孔距较小时理论模型不再适用;经对比分析后,在理论模型与试验所得结果中,随着孔距的改变侵岩垂直力有着相同的变化趋势,侵岩垂直力大小较为符合,激光预钻孔条件下滚刀侵岩理论模型具有一定准确性。The laser generator is installed on the cutterhead of the tunneling boring machine(TBM),and the high-energy laser is used to assist the TBM tunneling operation,which is expected to achieve the purpose of thermal-mechanically efficient rock breaking in theory.For the laser-assisted rock breaking by disc cutter,based on the method for elastic stress state of the stress concentration theory in a circular hole and the cavity expansion model,a theoretical model for rock penetration by cutter under laser pre-drilling is established considering the effects of dense core,and it is theoretically analyzed.Subsequently,the laser-assisted disc cutter indenter penetration tests under confining pressure are carried out to verify the theoretical model.The results show that both the edge width and the hole spacing have effects on the vertical force,and that when the hole spacing is small,the theoretical model is no longer applicable.Through comparative analysis of the theoretical model and the test results,the vertical force has the same change trend with change in the hole spacing and is relatively consistent.The theoretical model is of certain accuracy.

关 键 词：TBM 理论建模 激光预钻孔 小孔应力集中 试验验证 

分 类 号：U455.3[建筑科学—桥梁与隧道工程]