Theoretical Model of Shield Behavior During Excavation. I: Theory
Theoretical Model of Shield Behavior During Excavation. I: Theory
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DOI：
10.1061/(asce)1090-0241(2002)128:2(138
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发表时间：
2002-02
影响因子：
3.9
通讯作者：
M. Sugimoto;A. Sramoon
中科院分区：
文献类型：
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作者：
M. Sugimoto;A. Sramoon
闭式盾构施工方法与计算机辅助自动控制系统相结合。然而，自动控制系统是建立在经验关系的基础上的，没有精确的理论背景。考虑盾构隧道工程实际，建立了盾构开挖过程中作用在盾构上的理论动荷载模型；即开挖面积、尾间隙、刀面旋转方向、盾构滑动、盾顶地面松动、动平衡条件。为了定性地评价该模型的有效性，分别对砂质和粘土地基进行了直线和曲线排列时的盾构性能模拟和模型参数对盾构性能的敏感性分析。对盾构性能的计算结果进行了检验，并与经验和理论计算结果进行了比较，证实了所提出的模型较好地反映了盾构性能。
Closed-type shield tunneling methods were developed together with computer-aided automatic control systems. However, automatic control systems are based on empirical relationships and do not have a precise theoretical background. In this paper, a model of the theoretical dynamic load acting on the shield during excavation is developed, taking into account shield tunnel engineering practices; i.e., the excavated area, the tail clearance, the rotation direction of the cutter face, sliding of the shield, ground loosening at the shield crown, and the dynamic equilibrium condition. To evaluate the validity of the model qualitatively, the simulation of shield behavior and the sensitivity analysis of the model parameters on the shield behavior are carried out in both straight and curve alignments for both sandy and clayey ground. The results for the shield behavior are examined, comparing them with the empirical and the theoretical one, and it is confirmed that the proposed model represents the shield behavior reasonably well.