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隧道变形是隧道安全检测的重点之一,同时也是评估隧道安全状态的重要内容。随着激光技术的发展,激光扫描技术近年来逐步应用于隧道断面检测。目前已有的隧道断面拟合方法较为单一,针对这一情况,提出将精确曲线拟合方法应用于隧道断面拟合成。NURBS曲线可以精确表示二次圆弧的特点,利用这一特点,提出了将NURBS曲线拟合应用于圆弧型隧道断面拟合,并通过计算拟合曲线上的点到标准轮廓曲线的最短距离对拟合效果进行评价。通过使用隧道设计标准断面数据进行数值仿真验证,结果表明NURBS曲线可以良好实现隧道断面的拟合,NURBS方法拟合曲线更加贴近隧道断面的真实状态。
Tunnel deformation is one of the focuses of tunnel safety testing, and it is also an important part of evaluating tunnel safety status. With the development of laser technology, laser scanning technology in recent years gradually applied to the tunnel section detection. At present, the fitting method of tunnel section is relatively simple. In view of this situation, it is proposed that the accurate curve fitting method is applied to tunnel section fitting. NURBS curve can accurately represent the characteristics of quadratic arcs. Based on this feature, the NURBS curve fitting method is applied to arc tunnel section fitting. By calculating the shortest distance between the point on the fitted curve and the standard contour curve Evaluate the fit effect. The results of numerical simulation using tunnel design standard cross-section data show that the NURBS curve can well fit the tunnel cross-section, and the fitting curve of NURBS method is closer to the real state of the tunnel cross-section.