富水岩溶隧道围岩变形动态监测及回归分析

Dynamic Monitoring and Regression Analysis of Surrounding Rock Deformation of Tunnel in Water-En Riched Karst Tunnel

深入研究富水岩溶隧道围岩变形动态曲线,回归分析围岩动态监测数据,预测围岩动态变形,为富水岩溶隧道设计、开挖及支护提供理论依据与技术手段。得出研究结论:(1)未支护前岩溶隧道各断面围岩变形速率最快,支护之后变形速率明显减缓,在支护100d左右时围岩变形趋于稳定,其中富水岩溶地质段围岩变形量更大,变性特点更明显;(2)围岩宏观变形可分为三个阶段,即前期线弹性变形阶段,后期线弹性变形阶段以及稳定变形阶段;(3)基于围岩三阶段变形特点,建立三阶段变形动态模型,求解模型得到围岩动态计算方程,拟合优度高。

Provide theoretical basis and technical means for the design,excavation and support in water-enriched karst tunnel by studying the dynamic curve of surrounding rock deformation in water-enriched karst tunnel,regressing and analyzing the dynamic monitoring data of surrounding rock,and predicting the dynamic deformation of the surrounding rock.The findings are as follows：（1）The each section deformation rate of surrounding rock in Karst tunnel is the fastest before supporting and obviously slowed down after supporting.The deformation Surrounding rock tends to be stable in support of lOOd.Particularly,the deformation quantity of surrounding rock is Larger and the degeneration characteristic is more obvious.（2） The macro deformation of surrounding rock can be divided into three stages what is the early stage of the elastic deformation,the later stage of the elastic deformation and the stable deformation stage.（3）The dynamic model of three stage deformation can be established by basing on the three stage deformation characteristics of surrounding rock and Based on the deformation characteristics of surrounding rock at the three stage,is established,and dynamic calculation equation of surrounding rock can obtained though Solving the three stage deformation dynamic model.