【摘要】 鉴于隧道防排水型式在城市矿山法隧道中的重要性,本文以深圳水库下游东部过境高速公路连接工程为背景,在分析现有成果的基础上,基于流-固耦合作用机理,采用FLAC3D有限差分软件对城市矿山法隧道在不同防排水型式下的渗流力学特征进行研究,研究结果表明:城市矿山法隧道在防水板全包-堵水型中,衬砌背后孔隙水压同静水压力基本保持一致;在防水板半包-排水型和防水板全包-排水型中,孔隙水压力以及二衬最大拉应力和最大压应力均产生不同程度的减少。对于不同防排水型式,最大孔隙水压均位于拱底处,最小主应力均位于拱脚处,最大主应力均位于拱底处,水平方向位移最大值位于拱腰处,而竖直方向位移最大值位于拱顶或拱底处。更多还原

【Abstract】 In view of the importance of the tunnel waterproof and drainage patterns in the urban tunnels,a will-be-built highway tunnel in the downstream of the Shenzhen reservoir was used as background support.Based on the relevent literatures and the fluid-soild coupling mechanism, the seepage and mechanical characteristics of the urban mined tunnel with different waterproof and drainage modes were analyzed through the finite difference software( FLAC3D). The main results are listed as follows. In the whole encapsulation waterproof type of the urban tunnels,pore water pressure behind the line is basically consistent with the hydrostatic pressure. In the whole( half) encapsulation drainage type,pore water pressure as well as the maximum tensile stress and the maximum compressive stress in the second line are reduced. For different types of waterproof and drainage,the maximum pore pressure lie in the bottom of the arch,the minimum principal stress lie in the foot of the arch,and the maximum principal stress lie in the bottom of the arch. The maximum horizontal displacement lie in the waist of the arch,while the maximum vertical displacement lie in the bottom or vault of the arch.更多还原