摘要
为研究富水软岩隧道最优排水方案,以甘肃省道S304线关山隧道为研究对象,基于流固耦合分析理论,建立了应力场和渗流场作用下的隧道开挖模型。借助SoilWorks有限元软件对隧道全排水、全封堵及堵水限排三种施工方案进行了模拟,并对孔隙水压力及水位线、位移场及应力场、围岩塑性区的分布规律进行了研究。结果表明:富水软岩隧道开挖时,采用堵水限排方案可以有效减小对地下水位的影响,经济效益显著;三种施工方案中,堵水限排方案隧道的拱顶沉降、隧底隆起以及地表下沉量最小,但围岩的应力最大,仰拱最大拉应力为全排水方案的2.2倍;全排水方案与全封堵方案围岩塑性区主要产生在仰拱,堵水限排方案围岩塑性区主要产生在边墙两侧,塑性区的范围较小。研究结果可为富水软岩地层同类工程排水方案的确定提供借鉴。
In order to determine the best drainage scheme of water-rich soft rock tunnel,the excavation models of the Guanshan tunnel in Gansu Province were established under stress and seepage fields based on the coupling theory of fluid and solid.The complete drainage scheme,non-drainage scheme,and controlled drainage scheme were analyzed using the finite element analysis software SoilWorks.The distribution characteristics of pore water pressure and water level,tunnel displacement and stress,and plastic zone of surrounding rock were studied.The results showed that the controlled drainage scheme can reduce the effect to underground water during the tunnel excavation;for the controlled drainage scheme,the amounts of crown settlement,invert uplift,and ground settlement are the smallest while the surrounding rock stress is the largest,and the invert maximum tension stress for the controlled drainage scheme is 2.2times of that for the complete drainage scheme;and the rock plastic zone is mainly distributed in the invert area for the complete drainage scheme and non-drainage scheme,and in the side wall for the controlled drainage scheme.The results can provide reference for the selection of drainage scheme of water-rich soft rock tunnel.
出处
《南水北调与水利科技》
CAS
CSCD
北大核心
2015年第2期349-353,共5页
South-to-North Water Transfers and Water Science & Technology
基金
陕西省自然科学基金项目(2010JM7021)
