摘要
假定土体不排水,利用弹性力学的Mindlin解,推导正面附加推力、盾壳与土体之间的摩擦力引起的地面变形计算公式;提出土体损失引起的三维地面变形计算公式。将正面附加推力、摩擦力和土体损失引起的地面变形计算公式叠加,得到盾构施工引起的地面变形计算公式,该方法适用于施工阶段。算例分析表明,该方法的计算结果与实测值相当吻合。盾构施工引起的纵向地面变形曲线呈“S”形;隧道开挖面上方处轴线两侧的地面产生隆起现象;在正常施工时,盾壳与土体之间的摩擦力对地面变形的影响远大于正面附加推力。
Assuming soil was undrained,the computing formulae of ground deformation induced by both bulkhead additive thrust and friction force between shield and soil were derived from the Mindlin solution in elastic mechanics.Formula of ground deformation induced by ground loss was offered.Combining the formulae of ground deformation induced by ground loss,bulkhead additive thrust,and the friction force between shield and soil,the formula of total ground deformation induced by shield tunneling was obtained.This method was applied to the construction phase.As shown in analytical calculation,the calculated results were in accordance with the field data.Longitudinal surface deformation induced by shield tunnel was assumed as a S-shaped curve.Surfaces on both sides hunched up at the axis of excavation face.During normal construction process,the friction force between shield and soil exhibited greater influence on surface deformation compared with bulkhead additive thrust.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第z1期3317-3323,共7页
Chinese Journal of Rock Mechanics and Engineering
关键词
隧道工程
盾构隧道
地面变形
正面附加推力
摩擦力
土体损失
tunnelling engineering
shield tunnel
surface deformation
bulkhead additive thrust
friction force
ground loss
