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基坑施工不可避免会对邻近的盾构隧道沉降产生影响,进而影响盾构隧道结构健康。如何选择合适的方法对隧道沉降监测点数据进行拟合,找出基坑施工参数与盾构隧道沉降趋势之间的内在关系,对快速判别盾构隧道结构性能有重要意义。本文利用三次B样条曲线在连接点处曲率保持一致的独特优势,用该方法对某毗邻型基坑施工期间引起的盾构隧道沉降监测数据进行拟合,在此基础上绘制出施工前后盾构隧道累计沉降的曲率曲线,了解盾构隧道结构的整体受力状态。曲率曲线既能有效地寻找到隧道结构薄弱部位,又能通过与地铁保护区曲率控制标准进行对比,判断隧道结构受力是否超限,为隧道的健康评判提供准确依据。
The construction of the foundation pit inevitably will affect the settlement of the adjacent shield tunnel, which will affect the structural health of the shield tunnel. How to select the suitable method to fit the data of tunnel settlement monitoring points and find out the inherent relationship between the construction parameters of foundation pit and the tendency of settlement of shield tunnel is of great significance for quickly distinguishing the structural performance of shield tunnel. In this paper, we use the unique advantage that the cubic B-spline curve has the same curvature at the connection point. By using this method, the monitoring data of the shield tunnel settlement caused during the construction of an adjacent type of foundation pit are fitted, and on this basis, The total curve of the settlement of the tunnel construction curves to understand the overall structure of the shield tunneling state. The curvature curve can not only effectively find the weak parts of the tunnel structure, but also compare with the curvature control standard of the MTRC to determine whether the stress of the tunnel structure exceeds the limit, thus providing an accurate basis for the tunnel health assessment.