摘要
在公路隧道工程中,对于Ⅳ级以上的围岩,三台阶法和CRD法被广泛使用。但是,这两种开挖方法对Ⅳ级以上围岩的稳定性产生不同的影响。因此,本文以湖南通城至平江高速公路的姜源岭隧道为依托,利用数值软件,在深埋和浅埋2种条件下,对Ⅳ级以上围岩分别采用三台阶法和CRD法开挖进行数值模拟,分析和比较在这2种开挖方法下隧道围岩的应力、位移和塑性区的特征,研究这两种开挖方法对隧道围岩稳定性的影响。研究结果表明:在深埋和浅埋两种条件下,采用CRD法开挖可以在围岩主应力分布、位移场大小和塑性区范围3者中达到最佳效果,更适合Ⅳ级以上围岩的施工方法。
In highway tunnel project,three-step method and CRD method are widely used for the surrounding rock above class Ⅳ.however,these both excavation method have different influences on stability of surrounding rock above class Ⅳ.Therefore,this paper is based on JiangYuanLing tunnel of high way from Tongchengto Pingjiang of Hunan,presents numerical simulation with three bench excavation method and CRD excavation method for the surrounding rock above class Ⅳ by FLAC3D software in deep buried and shallow buried conditions,analysises and compares characteristics of surrounding rock stress,displacement and plastic zone,and researches the influence on stability of surrounding rock between three-step method and CRD method.The study results show this： Using CRD excavation method can achieve the best effect on the stress distribution,displacement distribution and scope of the plastic zone of surrounding rock in deep buried and shallow buried conditions,and more suitable for the construction method of surrounding rock above class Ⅳ.
出处
《公路工程》
北大核心
2012年第6期138-142,共5页
Highway Engineering
关键词
公路隧道
三台阶法
CRD法
数值模拟
塑性区
shighway tunnel
three-step method
CRD method
numerical simulation
plastic zone
