高强度围岩隧洞TBM刀具磨损规律研究

Research on wear law of cutters for TBM tunneling in hard rock

刀具磨损是影响TBM掘进效率的重要因素,该文以北疆供水二期工程XEVⅢ标段隧洞为依托,开展高强度围岩条件下刀具磨损规律研究。该标段已掘进段围岩强度最大为160MPa,平均为120MPa。根据掘进过程中的刀具磨损统计资料,分析不同刀位的刀具磨损值、围岩强度和掘进参数对刀具磨损的影响以及不同掘进参数对刀具磨损的敏感度,结果表明:中心滚刀和正面滚刀的累计磨损量随安装半径增大呈指数式增长,边缘滚刀累计磨损量受安装角度影响,随安装半径增大先增大后减小;边缘滚刀的单刀磨损量最大,正面滚刀次之,中心滚刀最小;随着围岩强度提高,中心滚刀和正面滚刀每延米磨损量呈指数型增长,边缘滚刀每延米磨损量呈二次函数型增长,所有刀具每延米累计磨损量呈线性增长;围岩强度不变时,随着刀盘转速、刀盘扭矩、推力、贯入度增大,刀具每延米磨损量均呈二次函数型变化,先增大后减小,随着掘进速度增大,刀具每延米磨损量呈二次函数型变化,先减小后增大;刀具磨损对刀盘扭矩和推力最为敏感,为减小磨损,建议施工中将刀盘扭矩控制在1100~1300kN·m或2100~2400kN·m,将推力控制在9000~11000kN或15000~16000kN。

Cutters wear is an important factor affecting the efficiency of TBM tunneling.In order to study the law of TBM cutters wear in high strength surrounding rock,the tunnel of XEVⅢsection of the second phase of water supply project in North Xinjiang is studied here.The maximum strength of surrounding rock of the tunnel is 160 MPa,and the average strength is about 120 MPa.According to the cutters wear data in the process of TBM tunneling of 5250 m,The cutters wear of different positions,the influence of surrounding rock strength and tunneling parameters on cutters wear and the sensitivity of different tunneling parameters to cutters wear are studied.The results show that the cumulative wear of the center cutters and the front cutters increases exponentially with the increase of the installation radius,and the cumulative wear of the edge cutters is affected by the installation angle,which increases at first and then decreases with the increase of the installation radius.The single cutter wear of the edge cutters is the largest,the front cutters is the second,and the center cutters is the smallest;with the increase of surrounding rock strength,the wear per meter of center cutters and front cutters increases exponentially,and the wear per meter of edge cutters increases quadratically,and the cumulative wear per meter of all cutters increases linearly.When the surrounding rock strength is constant,with the increase of cutter head speed,cutter head torque,thrust and penetration,the cutters wear per meter changes quadratically,which firstly increases and then decreases,and with the increase of tunneling speed,the cutters wear per meter appears to be quadratic,firstly decreases and then increases.Cutters wear is the most sensitive to cutter head torque and thrust.In order to reduce cutter head wear,it is suggested that the cutter head torque shall be controlled in the range of 1100~1300 kN·m or 2100~2400 kN·m,and the thrust should be controlled in the range of 9000~11000 kN or 15000~16000 kN.