摘要
为解决TBM设备在硬岩地层施工过程中单刃边滚刀失效较严重的问题,对边滚刀在破岩过程中的振动特性进行研究。首先,基于对破岩时边滚刀的受力分析,将其所受载荷简化为垂向力、轴向力以及倾覆力矩,建立滚刀动力学模型。然后,运用MATLAB/Simulink建立边滚刀动力学仿真模型,由ANSYS/Ls-dyna仿真得到的边滚刀破岩载荷历程作为该动力学模型的输入激励,仿真得到边滚刀各部件振动位移响应曲线。最后,通过改变模型中滚刀各部件的刚度大小,研究其对滚刀振动的影响。研究发现:1)对于安装角为45°的边滚刀,在花岗岩地层中破岩时,其刀圈侧向振动幅度比垂向振动幅度大22%左右,侧向摆角最大可达到0.406°。2)刀圈与轴承的刚度是影响滚刀振动和侧向摆动的重要因素,增大1倍刀圈刚度,滚刀垂向、侧向振幅和摆动振幅分别降低26.6%、31.5%、31.0%;增大1倍轴承刚度,滚刀垂向、侧向振幅和摆动振幅分别降低19.5%、14.1%、21.7%。
Serious failure often occurs to the single blade edge disc-cutter when TBM boring in hard rock stratum.Hence,it is necessary to study the vibration characteristics of the edge disc-cutter during rock breaking process.Firstly,based on the analysis of the load of the edge disc-cutter in the rock breaking process,the loads are simplified as vertical force,axial force and overturning moment to establish an edge disc-cutter dynamic model.And then the dynamic simulation model of edge disc-cutter is established by using MATLAB/Simulink;the load history of the cutter obtained by ANSYS/Ls-dyna is used as the input stimulus of the dynamic model,thus the vibration displacement response curve of each part of the edge disc-cutter is obtained.Finally,the effect of the stiffness on the cutter vibration is studied by changing the size of the various components in the model.The results show that:(1)When the edge disc-cutter with an angle of 45°is installed to break the rock in the granite stratum,the lateral vibration amplitude of the cutter ring is about 22%larger than the vertical vibration amplitude,and the maximum lateral swing angle can reach 0.406°.(2)The stiffnesses of cutter ring and bearing are the important factors that affect the lateral vibration and swing of cutter;if the stiffness of the cutter ring is doubled,the vertical,lateral and swing amplitudes of the cutter can be reduced by 26.6%,31.5%,31.0%,respectively;if the bearing stiffness is doubled,the vertical,lateral and swing amplitudes of cutter can be reduced by 19.5%,14.1%,21.7%,respectively.
作者
张斌荣
管会生
谭孝锋
廖江
杨骁
李霞
ZHANG Binrong;GUAN Huisheng;TAN Xiaofeng;LIAO Jiang;YANG Xiao;LI Xia(College of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)
出处
《隧道建设（中英文）》
北大核心
2020年第6期833-839,共7页
Tunnel Construction
基金
国家重点研发计划(2017YFB0305905)。
