TBM护盾-围岩相互作用荷载识别方法  

Identification of the interaction loads between TBM shield and surrounding rock

作　　者：刘鹤 刘泉声[3,4] 唐旭海 罗慈友 万文恺 陈磊 潘玉丛 LIU He;LIU Quan-sheng;TANG Xu-hai;LUO Ci-you;WAN Wen-kai;CHEN Lei;PAN Yu-cong(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Science,Beijing 100049,China;School of Civil Engineering and Architecture,Wuhan University,Wuhan,Hubei 430072,China;Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]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,湖北武汉430071 [2]中国科学院大学,北京100049 [3]武汉大学土木建筑工程学院,湖北武汉430072 [4]武汉大学岩土与结构工程安全湖北省重点实验室,湖北武汉430072

出　　处：《岩土力学》2019年第12期4946-4954,共9页Rock and Soil Mechanics

基　　金：国家重点基础研究发展计划项目（973计划）（No.2015CB058102）;国家自然科学青年基金（No.41807250）~~

摘　　要：随着隧道掘进机(tunnel boring machine,TBM)开挖隧道埋深逐渐加大,穿越的地层结构更加复杂,如何降低卡机风险成为亟待解决的问题。提出了一种基于牛顿迭代和有限元理论的TBM护盾-围岩相互作用荷载反演方法。该反演方法以护盾内表面测点应变测量值与计算值的误差作为目标函数,并引入Moore-Penrose广义逆对反演方程进行求解。采用了护盾外表面有限分区的策略,定义各分区节点荷载值为反演参数,可以方便地控制反演参数的数量。各分区内部荷载通过节点值插值得到,实现了护盾表面任意分布荷载的离散拟合。算例结果表明:该反演方法计算效率高,对观测值误差具有很好的免疫效果;能够有效地获取护盾外表面的荷载分布规律和摩阻力的大小,在一定程度上能够为现场安全掘进、卡机预警以及事故处理提供指导。同时,该反演算法也可以扩展到低维情况,对其他结构受力或者物理参数的反演具有一定的借鉴意义。As the buried depth of TBM-excavated tunnels increases, how to reduce the risk of TBM shield jamming becomes an urgent problem. Based on the Newton iteration and the finite element method, an inverse method for the identification of the interaction loads between shield surface and surrounding rock mass is proposed. The error between measured and calculated strain values of the observation points on the internal shield surface is set as the objective function, and the Moore-Penrose inverse is introduced to solve the inverse equation. Meanwhile, a finite partition strategy for the external shield surface is adopted, then the nodal loads of partitioned areas are defined as the inverse parameters, which is convenient for the control of the number of the inverse parameters. The loads within each partitioned region are obtained by the interpolation of the nodal loads, and the fitting of the arbitrary distributed loads acting on the external shield surface is realized. The results of numerical examples show that: the proposed inverse method is featured with high computational efficiency, and good immunity to observation error;the load distribution law and the magnitude of friction on the external shield surface can be identified effectively by performing the inverse analysis. To a certain extent, it can provide guidance for safe tunneling, jamming warning and accident treatment. Furthermore, the proposed method can also be extended to the low-dimensional cases and provide reference for the inverse analysis of other structure loads or physical parameters.

关 键 词：隧道掘进机(TBM) 荷载识别 反演 牛顿迭代 

分 类 号：O319.56[理学—一般力学与力学基础]