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盾构隧道的管片姿态是影响盾构隧道成型后安装质量的重要因素,盾构隧道的形变也往往体现在盾构隧道管片姿态的变化。盾构隧道通常设计为圆形或椭圆形,而变形后的断面通常表现出椭圆特征。因此,针对现有隧道断面检测计算模型的不足,本文提出一种更具代表性的基于椭圆的盾构隧道管片姿态算法模型,采用附不等式约束的椭圆拟合方法以迭代算法进行求解。实例数据验证该模型不仅能精确计算盾构隧道的管片姿态参数,也能对盾构隧道管片姿态进行形变分析并实现精度评定,在涉及空间姿态计算及变形监测的其他领域也具有良好的应用价值。
The shield attitude of the shield tunnel is an important factor that affects the quality of the shield tunnel after installation. The deformation of the shield tunnel is often also reflected in the change of shield tunnel segment attitude. Shield tunnels are usually designed to be circular or oval, while the deformed cross-section usually shows elliptical features. Therefore, aiming at the shortcomings of the existing tunnel section detection and calculation model, this paper presents a more representative ellipse-based shield tunnel segment attitude algorithm model, which is solved by an iterative algorithm using an ellipse fitting method with inequality constraints. The example data verify that this model not only can accurately calculate the slice attitude parameters of the shield tunnel, but also can perform the deformation analysis and the accuracy assessment of the shield tunnel slice attitude, and also has good performance in other fields involving space attitude calculation and deformation monitoring Value.
