摘要
依托西康高速公路油房湾小净距隧道工程,对隧道围岩——石灰岩的流变特性进行了试验研究,给出了流变变形特性曲线,建立了能描述油房湾隧道围岩流变变形特征的流变模型。基于流变反演理论,获得了相应模型的弹性性能参数(岩体弹性体积模量、剪切模量和变形模量等)和流变参数及长期弹性模量等。利用反演流变模型及参数,并结合油房湾小净隧道工程地质特点及施工方案进行了三维流变数值模拟分析。结果表明,小净距隧道围岩变形时效特性规律基本符合H-K模型特征,表明基于试验辨识的H-K蠕变模型和反演参数的数值模拟能超前做出科学预测和定量评价,为山岭小间距隧道的设计和施工提供了可靠的参考信息和理论依据。
Based on the closely-spaced twin tunnels at Youfangwan on Xi＇an-Ankang expressway, the rheological characteristics of rocks ware tested for the limestones around the tunnel. The rheological deformation graph was obtained, and the rheological model for describing the rheological characteristics of the surrounding rocks at Youfangwan tunnel was set up. According to the rheological back analysis theory, the elastic volume modulus, the shear modulus and the theological parameters corresponding to rheological models were obtained. 3D theological numerical simulation were carried out according to the rheological back analysis model and parameters, the geological characteristics of the closely-spaced tunnels and the construction project at Youfangwan. Results indicated that the deformation characteristics of rocks around the closely-spaced tunnels agreed well with the characteristics of the H-K model, which showed that the numerical simulations based on the identified H-K model and the parameters can make the scientific prediction and the quantitative evaluation for the tunnel, which provided reliable information and theoretical basis for the engineering design of closely-spaced mountain tunnels.
出处
《现代隧道技术》
EI
北大核心
2009年第5期61-65,共5页
Modern Tunnelling Technology
关键词
山岭隧道
石灰岩
流变试验
模型识别
数值模拟
Mountain tunnels
Limestone
Rheological test
Model identification
Numerical simulation
