摘要
浅埋暗挖隧道掌子面稳定是隧道施工的前提,暗挖隧道掌子面拱部因开挖土体会向隧道内挤压移动造成土层变形,土层中应力重新分布而形成纵向土拱可承担上部土体的荷载,保持顶部掌子面稳定。隧道掌子面未开挖土体受竖向力及土层深处水平力作用形成滑裂面的基本特征是倾斜的滑动平面。研究非粘性土层、粘性土层隧道核心土作用和不同性质土层,确定隧道最大开挖高度。
Face stability of shallow-buried covered excavation tunnel is the precondition for tunnel construction. Soil stratum deformation may be caused at the covered excavation tunnel face arch due to extrusion and movement of excavation soil towards tunnel, and longitudinal soil arch could be formed after stress redistribution in soil stratum and could support the load of upper soil and keep the face stability. Unexcavated soil at tunnel face under longitudinal load and horizontal force at deep soil stratum formed slip crack surface, which is an oblique slip plane. Core soil action of cohesive and non-cohesive soil stratum and different strata were studied to determine the maximum excavation height of tunnel.
出处
《建筑技术》
北大核心
2017年第6期583-586,共4页
Architecture Technology
关键词
浅埋暗挖
纵向土拱
掌子面高度
核心土作用
shallow-buried covered excavation
longitudinal soil arch
tunnel face height
core soil action
