渗流场对麻崖子隧道开挖影响数值分析

隧道开挖改变了原岩应力场和地下水渗流场的分布,渗流场的改变会引起围岩应力场的改变,而围岩应力又会反过来影响岩体的结构,改变岩体的渗流特性.渗流场和应力场的相互作用,使围岩稳定性降低,严重时会造成围岩坍塌等灾害性事故.本研究根据工程实际对麻崖子隧道进行了考虑渗流效应下的开挖分析.结果表明:研究得到了隧道开挖后围岩应力场、孔隙水压力、位移场的分布情况,并给出了相应的施工建议.鉴于隧道设计施工过程中考虑渗流效应是有必要的,故模拟结果对于山岭富水地区隧道设计、施工及防排水设计有一定的指导意义.

Analysis of Mayazi tunnel excavation under considering the seepage field

The initial geostress and seepage field are destroyed because of tunnel excavation.Seepage field change will cause changes of geostress.Moreover,geostress variation will also cause structural change of the rock,which will change seepage characteristic.The interactions of seepage field and geostress field give a complex impact on the surrounding rock of the tunnel,which can reduce the stability of surrounding rock.Surrounding rock collapsing,water inflow and other disastrous accidents may turn out in serious time.A uumerical method for Mayazi tunnel is given with considering seepage effect.The distribution of stress field,pore water pressure,displacement field after tunnel excavation are obtained and attentions are also paid during construction.It is necessary to consider seepage effect during the design and construction of a tunnel.The calculated results is essential guiding significance to the design,construction and waterproof and drainage techniques of tunnels.