基于最小二乘法的隧道地表沉降拟合研究

依托武汉市红黏土地区光谷一路-高新四路排水通道工程,基于有限元分析软件PLAXIS,开展双侧壁导坑隧道施工的数值分析,重点关注不同施工阶段的地表横向沉降曲线。在此基础上,对不同沉降曲线进行拟合回归分析。结果表明：随着施工推进,地表沉降最大值逐步增大,隧道施工引起的地层损失也逐渐增大;地表沉降曲线在不同施工阶段都呈Peck沉降曲线分布形式;利用最小二乘法回归分析,可以对双侧壁导坑隧道施工引起的地表沉降曲线进行拟合。该拟合方法具有较好的适用性。

Study on Surface Settlement Induced by Tunnel Based on Least Square Method

Based on the Guanggu 1st Road- Gaoxin 4th Road Drainage Channel Project in the red clay area of Wuhan City, the finite element analysis software PLAXIS was used, numerical analysis of the tunnel with double-side drift method was carried out, focusing on the surface settlement at different stages. On this basis, a fitting regression analysis was performed for different settlement curves. The results show that as the tunnel propulsion, the maximum surface settlement gradually increases, and the volume loss caused by tunneling also gradually increases. The surface settlement curve is in the form of Peck settlement curve distribution at different stages. It is proper to fit the surface settlement curve induced by tunneling using least square regression analysis.