改进的Logistic模型在隧道围岩变形预测中的应用

摘要

改进Logistic模型由于能够比较好的拟合软土地基在荷载作用下的变形过程曲线,因而在地基沉降预测中得到了较多的应用.鉴于隧道围岩变形曲线和地基沉降曲线在形式上的相似性,将改进的Logistic模型用于隧道围岩变形预测分析中,并通过工程实例应用对其可行性进行了验证.结果表明:该模型能够很好的反映隧道围岩变形量与时间的关系,能够非常准确的预测围岩变形量.该模型为隧道监控数据处理提供了一种新方法和新思路,并可为今后的预测分析提供一定的借鉴和参考.%The improved Logistic model is widly used in the prediction of ground settlement, beacause it can fit the settlement curve of ground well. In this paper, the improved Logistic model is uesd to predict the deformation of tunnel surrounding rock mass, beacause the surrounding rock mass deformation curve of tunnel and the settlement curve of ground are very similar, and its rationality is verified though engineering case. The result shows that this model can reflect the relationship between deformation and time well, and can predict the deformation precisly. So, this model presents a new method for analysis and prediction of surrounding rock mass deformation in tunnel controlling.