摘要
为评估深厚软土地区临近超浅埋地铁施工对盾构的扰动,结合斜交超浅埋地铁的某客运专线桩板结构路基工程,基于"第三方监测"的工程安全监控模式进行施工及试运营期间的安全评估,并研究了各阶段的变形规律及安全敏感因素。研究结果表明:地铁水平位移只出现于桩基施工阶段;沉降变形与收敛变形则贯穿于整个施工与运营阶段,变形值呈"增大—减小—稳定"的趋势;地铁变形中沉降影响最大,收敛变形次之,水平位移最小,且变形极值均小于安全限值,说明地铁结构是安全的;桩板结构有效控制了后续沉降的发生,大大降低了新建客运专线与既有地铁的相互影响。
Based on the safety model of ＂the third party monitoring＂,the deformations of metro and pile-board subgrade are observed to evaluate the disturbance caused by constructing near over-shallow-embedded metro during construction and operation.The deformation rules and safe targets of each stage are raised according to the pile-broad subgrade structure of a certain passenger dedicated line.The result shows that horizontal displacements of metro only take place during pile foundation construction,while settlements and convergences continue through both stages.Of all the deformations,influence of settlements comes first with that of convergences followed,and horizontal displacements hold minimal impact.All of these deformations experience a process of ＂increase-decrease-steady＂ with maximal values less than safety limits,which proves that the pile-broad subgrade can effectively control the deformations and evidently reduce the interaction effect of new built railway and existing metro.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2011年第7期144-150,共7页
China Safety Science Journal
基金
中铁第四勘察设计院集团有限公司科研项目(2010K25)
关键词
客运专线
桩板结构路基
超浅埋地铁
变形监控
安全评估
passenger dedicated line
pile-board subgrade
over-shallow-embedded metro
deformation observation
risk evaluation
