【摘要】 采用有限元方法,对松散堆积体中的浅埋小净距隧道施工力学行为进行了数值模拟。结果表明:地层沉降主要发生在两洞拱顶之间的土体范围,且后行洞拱顶部位的扰动范围明显大于先行洞;施工工序对拱顶沉降变形路径影响较大,但对其最终沉降影响并不明显;施工时锁脚锚杆的施工质量有重要作用。更多还原

【Abstract】 The mechanical behavior of shallow closely-spaced twin tunnels in loose deposits during construction is analyzed with the finite element method.The numerical results show that the ground settlement occurs mainly between the crowns of twin tunnels.The disturbed zone of of the crown of the later tunnel is greater than the preceding tunnel.The construction sequence has great effect on the displacement path of the crown but barely on the total deformation.The lock foot anchor on tunnel frame plays an important role on the controlling of tunnelling.更多还原