摘要
依托兰州城市轨道交通1号线某区间试验段工程,对砂卵石地层中双洞地铁隧道盾构选型和地层变形进行研究。引入盾构扭矩和推力的数学计算模型,计算结果应用于现场工程施工和有限元三维数值模拟中,分析了双洞隧道先后施工时,地层沉降槽的范围、特征、变化规律以及开挖引起的横向和纵向水平方向上地层位移影响范围和影响规律。结果表明:1)越接近地表,隧道先后开挖对沉降槽的扰动效应越弱;2)由两隧道同向先后施工引起的地层最终沉降槽非对称特征明显;3)水平向地层的扰动效应叠加,地层易出现剪切变形,需采取必要防护措施;4)现场监测结果与数值模拟结果基本一致,证明所采取的施工工法合理,施工沉降总体控制效果良好。
The shield type selection and ground deformation rule of a twin-tube Metro tunnel on No.1 line of Lanzhou urban rail transit in sandy cobble strata are studied.The mathematic calculation model of torque and thrust of shield is introduced and the calculation result is used in the field tunneling and the 3D finite element simulation,the range, characteristics and variation rules of the settlement trough and the range and rule of the influence of the ground deformation in transverse direction and longitudinal direction induced by shield boring are analyzed.The study result shows that：1 ）The closer to the ground surface,the smaller the disturbance effect of the tunnel boring on the settlement trough;2）The asymmetric feature of the ground settlement is obvious;3）Due to the superposition of the disturbance effect of the ground in horizontal direction,the ground is subject to shear deformation,therefore necessary protection measures should be taken;4）The monitoring data are in good agreement with the numerical simulation result,which shows that the construction methods adopted are rational and the settlement has been brought under effective control.
出处
《隧道建设》
2014年第8期721-730,共10页
Tunnel Construction
作者简介
杨晓华（1976-），男，陕西安康人，1999年毕业于兰州铁道学院，交通土建工程专业，本科，高级工程师，现主要从事工程管理工作。
