摘要
在大直径泥水盾构隧道施工中,开挖面稳定性问题显得尤为突出,但对于高透水性、砂质、浅覆土地层开挖面稳定的影响因素及其稳定性分析尚不成熟。利用有限元数值模拟,研究不同内摩擦角、水深、盾构埋深以及开挖面支护应力对开挖面稳定性的影响。讨论大直径泥水盾构开挖面稳定性各因素之间关系。研究结果表明,内摩擦角改变对于盾构开挖面影响显著,水深改变对开挖面影响不大,开挖面凹凸性在λ（应力支护比）=0.8-0.9之间改变,应力支护比在0.9-1之间时,变形量最小,可以为工程提供经验。
Abstract： In large-diameter slurry shield tunnel construction, the excavation face stability problem is prominent, but the study on excavation face stability and relevant influence factors for sandy and shallow overburden soil with high water permeability layer has not been mature. Based on numerical simulation of finite element model, this study explores effects of such factors as different friction angles, depths of water, buried depth of shield and excavation surface supporting stress on the excavation face stability. Besides, it discusses the relationship be- tween various factors for the large-diameter slurry shield tunnel excavation face stability. Results show that, fric- tion angle change has significant effects on shield tunnel excavation face while the depth change of water shows no effect; the excavation surface deformation direction changes when k is between 0.8-0.9, and excavation surface deformation reaches the minimum when k is between 0.9 - 1.
出处
《华东交通大学学报》
2016年第1期89-93,共5页
Journal of East China Jiaotong University
关键词
泥水盾构
开挖面
稳定性
支护应力比
slurry shield
the excavation face
stability
supporting stress ratio
