摘要
水力联合TBM(隧道掘进机)在刀盘边缘高线速度状态下,高压水射流喷嘴难以有效发挥射流切割能力,成为制约水射流技术助力机械滚刀破岩效率提升的关键问题,基于此,本文首先对比TBM刀盘边缘的线速度(2.6~4.0 m/s)与水射流岩石切割试验中喷嘴移动速度(0.01~1.50 m/s),发现当前实验室水射流切割试验无法合理反映TBM工作时刀盘高线速度与切割能力的匹配问题;其次,开展砂岩和花岗岩的水射流重复切割试验;最后,探讨提高水射流喷嘴高速移动状态下切割能力的方案,提出实验室开展高速水射流切割试验装备的优化方向,并分析TBM开展磨料水射流破岩的可行性。研究结果表明:试验最大速度下重复切割后砂岩及花岗岩切割深度分别增大100%和55%,说明重复切割可以显著提高水射流切割能力;重复切割岩石产生的热量会导致试样表面温度上升,试验后砂岩和花岗岩表面温度最大分别达到53.0℃和48.1℃;采用水射流重复切割以及研发特殊射流破岩技术,对于提高TBM刀盘边缘高线速度条件下水射流切割深度具有重要意义。
It is difficult for high-pressure water jet to effectively cut rock at high moving velocity on the edge of hydraulic combined TBM(tunnel boring machine)cutter head,which has become a key problem restricting the rock breaking efficiency improvement of hydraulic combined TBM.Based on this,firstly,the data of the linear velocity(2.6−4.0 m/s)of the edge of the TBM cutter head and the nozzle moving velocity(0.01−1.50 m/s)in the water jet rock cutting test were investigated.It is shown that the current laboratory water jet cutting test can not reasonably reflect the problem of matching high linear speed and cutting ability of TBM cutter head.Then,the water jet repeated cutting tests of sandstone and granite were carried out.Finally,the solution to improve the cutting capacity of water jet nozzles at high speed movement was discussed,the direction of optimizing the equipment for high speed water jet cutting tests in the laboratory was proposed,and the feasibility of carrying out abrasive water jet for rock breaking was analyzed.The results show that cutting depths of sandstone and granite increase by 150%and 55%respectively after repeated cutting at the maximum moving speed,which verifies the significant improvement of water jet cutting capability by repeated cutting.The heat generated by repeated cutting of rock will lead to an increase in ambient temperature.After the test,the maximum surface temperature of sandstone and granite reaches 53.0℃and 48.1℃,respectively.The repeated cutting by water jet for rock breaking and the development of special jet technology like abrasive water jet are of great significance to improve the cutting effect of water jet under the condition of high velocity at the edge of TBM cutter head.
作者
徐福通
周辉
李彦恒
高阳
卢景景
邱浩权
XU Futong;ZHOU Hui;LI Yanheng;GAO Yang;LU Jingjing;QIU Haoquan(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Engineering Design&Research Institute of Rocket Force,PLA,Beijing 100011,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第10期4024-4035,共12页
Journal of Central South University:Science and Technology
基金
中国科学院前沿科学重点研究计划项目(ZDBS-LY-DQC022)
国家自然科学基金资助项目(41941018)
中国科学院科技服务网络计划(STS计划)项目(KFJ-STS-QYZD-174)。
关键词
水力联合隧道掘进机
水射流切割试验
切割能力
喷嘴移动速度
切割装置优化
hydraulic combined tunnel boring machine(TBM)
water jet cutting tests
cutting capability
nozzle moving speed
optimal design of cutting device
