岩土力学2017，Vol.38Issue(10)：2962-2972,11.DOI:10.16285/j.rsm.2017.10.025
引大济湟工程TBM挤压大变形卡机计算分析与综合防控
Analysis and comprehensive prevention-control for TBM jamming induced by squeezing deformation of surrounding rock around water diversion tunnel from Datong river into Huangshui river
摘要
Abstract
This study aims to solve the problem of the frequent TBM jamming caused by the large squeezing deformation of surrounding rock around the water diversion tunnel from Datong river into Huangshui river in Qinghai province.Based on the constitutive model of squeezing deformation and the shield jamming prediction theory,we developed a procedure to calculate squeezing deformation and shield jamming.The main conclusions are drawn as follows.When TBM advances through F5 fault section and the overcut gap is 10 cm,the friction on the shield reaches the maximum thrust supplied by the propulsion system,which may result in shield jamming.As the growth of the downtime,the squeezing deformation,the contact area between surrounding rock and shield,and the friction on the shield increase with the stoppage.The growth rate is getting greater on the first day.However,the creep rate of surrounding rock and its friction growth tate decrease from the seventh day.The interaction between surrounding rock and shield reaches a balance until the thirteenth day,and the friction on the shield becomes stable.The above results are consistent with observed data in the field.Furthermore,to prevent and control shield jamming,we provide the following advice for optimal overcut and permissible downtime for further tunnelling,The over gap should be larger than 15 cm,under which the shield will not be jammed at the tunnelling unloading instant,and the permissive downtime is 2 days.When the overcut increases to 18 cm,the allowable stoppage is 4 days.While the over gap reaches 20 cm,shield jamming will not happen on the whole within 7 days under the surrounding rock condition,which also can be easily overcome.These control measures are substantially significant in the safety and efficiency of TBM tunnelling,which are also verified by the engineering practice.关键词
引大济湟/隧道掘进机(TBM)/挤压大变形/卡机/防控Key words
water diversion tunnel from Datong river into Huangshui river/tunnel boring machine (TBM)/squeezing deformation/shield jamming/prevention and control分类
建筑与水利引用本文复制引用
黄兴,刘泉声,彭星新,雷广峰,魏莱..引大济湟工程TBM挤压大变形卡机计算分析与综合防控[J].岩土力学,2017,38(10):2962-2972,11.基金项目
国家自然科学基金资助项目(No.41602326) （No.41602326）
国家重点基础研究发展计划(973)资助项目(No.2014CB046904,No.2015CB058102).This work was supported by the National Natural Science Foundation of China (41602326) and the National Program on Key Basic Research Project of China (973 Program) (2014CB046904,2015CB058102). （973）
