基于三维激光扫描技术的隧道预留变形量优化研究

目前隧道预留变形量的研究大多依赖于监控量测数据基于点的分析，很难得到隧道断面整体的变化情况。为解决传统监测技术单点监测无法满足隧道预留变形量调整的局限性，提出一种利用三维激光扫描技术基于全断面整体分析优化预留变形量的方法。以新安1号隧道为依托，发现试验段最大变形量7.5 cm小于设计预留变形量15 cm，结合质量保证率针对性地提出阶梯状设置预留变形量的优化方法。最终确定在试验段拱顶区域预留变形量设置为7 cm，其余区域预留变形量设置为5 cm。

Optimization of Reserved Tunnel Deformation Based on 3DLaser Scanning Technology

At present, most researches of reserved deformation of tunnels rely on point based analysis of monitoring data. Therefore, it is difficult to obtain the overall change of the tunnel cross section. In order to solve the limitation that traditional single point monitoring technology cannot meet the adjustment requirement of the reserved tunnel deformation, a method of optimizing the reserved deformation by using 3D laser scanning technology based on the whole cross section analysis is proposed. The applicable results of the method to Xin′ an No. 1 Tunnel show that the maximum deformation of the test section of 7.5 cm is less than the design reserved deformation of 15 cm. An optimization method is proposed based on quality guarantee rate to set the reserved deformation in a stepped shape. It is finally determined that the reserved deformation of the crown area is 7 cm, and that of other areas is 5 cm.