摘要
围岩的应力应变是分析隧道开挖中围岩稳定性的重要依据。文中通过大型有限元软件ANSYS,计算了不同埋深、不同坡度角、不同覆盖层厚度条件下,马鞍形浅埋偏压软岩隧道围岩的应力应变,分析其规律进行方案比选,确定了此类隧道比较合理的设计方案。分析结果表明:以2倍洞径的埋深作为偏压隧道深埋或浅埋的判断依据是合理的;隧道内壁各点的应力应变规律可以为隧道开挖中支护结构参数的选取提供参考。
In this paper,with large scale finite element software ANSYS,stress and strain of surrounding rock of the saddle-shaped shallow tunnel excavation in soft rock which are different depth,slope angle and covering layer thickness are calculated and analyzed,while its laws are educed and the schemes is compared,and the reasonable scheme is confirmed.The results show that： it is reasonable for 2 times of the tunnel depth as the judgment of deep or shallow unsymmetrical tunnel;the laws of stress and strain of the surrounding rock internal face in the tunnel excavation give reference to selection of the supporting structure configuration.
出处
《低温建筑技术》
2010年第11期76-78,共3页
Low Temperature Architecture Technology
关键词
浅埋偏压
软岩隧道
数值模拟
方案比选
shallow unsymmetrical
soft rock tunnel
numerical simulation
