引大济湟工程TBM挤压大变形卡机计算分析与综合防控

发布时间：2018-04-30 19:37

本文选题：引大济湟 + 隧道掘进机(TBM)　；参考：《岩土力学》2017年10期

【摘要】：针对青海省引大通河济湟水河(引大济湟)工程频繁遭遇挤压大变形和卡机灾害难题,基于挤压大变形本构模型和全断面隧道掘进机(TBM)卡机事故预测分析理论,提出了挤压大变形和卡机计算方法,进行了引大济湟工程TBM掘进围岩挤压大变形与卡机计算,结果表明:(1)TBM穿越F5断层区段时,当扩挖间隙为10 cm时,开挖卸荷后护盾所受摩阻力将达到推进系统提供的最大推力,易发生卡机事故;(2)挤压变形、围岩-护盾接触面积和护盾所受摩阻力随停机时间不断增大,停机1 d内增大的速率越来越大,停机后7 d起,围岩流变速率和护盾所受摩阻力增加速率均减缓,直到停机后13 d时,围岩-护盾相互作用达到平衡,护盾所受摩阻力趋于稳定。同时为了防止和控制卡机事故,对该工程后续施工提出了最佳扩挖间隙和许可停机时间等卡机综合防控的3个对策:即扩挖间隙至少要增大到15 cm,此时停机初始时刻不发生卡机,许可停机时间为2 d;扩挖间隙增大到18 cm时,许可停机时间为4 d;扩挖间隙增大到20 cm时,就选取的围岩条件下,停机7 d内TBM基本不发生卡机,7 d后也很容易克服卡机。提出的卡机防控措施对引大济湟工程TBM安全高效掘进具有一定的指导意义,并得到工程实际控制对策的验证。
[Abstract]:In view of the difficult problems of large extrusion deformation and jam disaster frequently encountered in the project of diversion of Datong River to Huangshui River (Yida Jichuang) in Qinghai Province, based on the constitutive model of large deformation of extrusion and the theory of prediction and analysis of the accident of TBM-based full-section tunnel tunneling machine, The calculation method of extrusion large deformation and clamping machine is put forward, and the calculation of large deformation and clamping machine of surrounding rock in TBM excavation of Dazihuang Project is carried out. The results show that when the cross section of F5 fault is crossed by TBM, the gap of expansion and excavation is 10 cm. After excavating and unloading, the friction resistance of shield will reach the maximum thrust provided by propulsion system, which is prone to press deformation, and the contact area between surrounding rock and shield and the frictional resistance of shield will increase with the stop time. The increasing rate of wall rock rheology and the friction resistance of shield decreased from 7 days after the shutdown, until 13 days after the shutdown, the interaction between surrounding rock and shield reached equilibrium. Resistance to friction against shields tends to stabilize. At the same time, in order to prevent and control card accidents, For the subsequent construction of the project, three countermeasures are put forward for comprehensive prevention and control of the clamping machine, such as the optimal expanding gap and the permitted downtime: the gap of expanding and digging should be increased to at least 15 cm, and at this time, the clamping machine will not occur at the initial time of shutdown. The allowable stop time is 2 days, when the gap increases to 18 cm, the allowable stop time is 4 days, and when the gap increases to 20 cm, under the selected surrounding rock condition, after 7 days of downtime, it is easy to overcome the clamping machine when the TBM does not occur in 7 days. The prevention and control measures put forward by the paper have certain guiding significance for the safe and efficient excavation of TBM in Data-Jihuang Project, and have been verified by the practical control countermeasures of the project.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;武汉大学土木建筑工程学院岩土与结构工程安全湖北省重点实验室;
【基金】：国家自然科学基金资助项目(No.41602326) 国家重点基础研究发展计划(973)资助项目(No.2014CB046904,No.2015CB058102)~~
【分类号】：TV554;TV68

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