分离式隧道变形曲线模型的建立与分析

Establishment and analysis of deformation models of parallel tunnels

监控量测技术可用于预测隧道施工时的变形,保障施工过程的安全。对于分离式隧道,由于两洞施工进度的不同,先开挖洞与后开挖洞之间的相互影响非常复杂。本文对内蒙古隆胜隧道的监控量测数据进行分析,以施工进度为自变量,建立了多个回归模型,分别运用相关分析理论、灰色理论、误差分析理论,综合地从三个层次来对残差进行标准化研究,得到准确的回归模型,较好地优化了传统回归分析法在选择非线性回归模型时存在的缺陷。以地表沉降数据为例,得到符合其变形特点的双曲线函数模型,验证了该方法的可行性与优异性。通过对比两洞之间实时监控的数据,总结了本项目隧道施工时非同步开挖的变形特点,结果表明:对于非同步开挖分离式隧道,后开挖洞在开挖中受到影响较大,且两洞变形基本同时稳定等结论。

In sitLi monitoring measurements can be used to predict the deformation and ensure the safety of tunnels during construction. Because of the different construction progress of two parallel tunnels, the mutual influence between two excavation holes is very complex. This： paper researches on the monitoring data from Longsheng tunnel in Inner Mongolia. Firstly, multiple regression models are established, with construction process as the independent variable. Then, correlation analySis theory, grey correlation theory and error analysis theory are applied to evaluate the correlation among several built regression models, which means three levels of residuals for standardization are considered. At last, we get the accurate regression models. This method better optimizes the result of traditional regression analysis method in nonlinear regression model, and proves to be feasible and excellent in the analysis of the measurement data of ground surface subsidence, the result of which shows the data confirms to hyperbolic function model. As an example, a series of calculations and analyses are carried out by comparing the two tunnels with the monitoring data., The results show that： for parallel tunnels excavated asynchronously, the later affects larger and deformation of two tunnels become stable at the same time.