摘要
采用有限元数值模拟方法,模拟在不采取预加固措施时厦门嘉禾园湖光路暗挖地下通道的施工过程。结果表明:深度越深地层沉降槽宽度越小,最大沉降值越大;掌子面通过后,地层水平位移曲线开始出现鼓包现象,从拱顶到通道底最大水平位移出现在通道侧墙中部靠上的位置;掌子面挤出位移呈现"四周小,中间大"的特征,最大位移出现在掌子面中心。据此提出高压旋喷桩结合长管棚预加固方案。经现场监测,该预加固方案控制地层变形效果明显。
The finite element numerical simulation method was used to simulate the construction process of the excavation underground passage without pre-reinforcement measures in Jiaheyuan lake light road of Xiamen. The results show that the deeper the depth,the smaller the width of formation settlement trough and the larger the maximum subsidence value is. The formation horizontal displacement curve begins to appear bulging phenomenon after the tunnel face excavation and the maximum horizontal displacement from the vault to the passage bottom appears at the upper position of the passage side wall. The extrusion displacement of tunnel face presents the characteristics of small around and large in the middle,and the maximum displacement occurs in the center of the tunnel face.Based on these law s,the pre-reinforcement scheme of high-pressure rotary jet grouting pile combined with long pipe shed was put forw ard. Through on-site monitoring,the pre-reinforcement scheme had obvious effect on controlling stratum deformation.
作者
杜俊
梅志荣
傅立磊
陈永照
DU Jun;MEI Zhirong;FU Lilei;CHEN Yongzhao(China Academy of Railway Sciences,Beijing 100081,China;China Railway Southwest Research Institute Co. Ltd. ,Chengdu Sichuan 611731,China;Xiamen Municipal Construction and Development Corporation,Xiamen Fujian 361015,China)
出处
《铁道建筑》
北大核心
2019年第3期52-55,68,共5页
Railway Engineering
基金
科技部科研院所技术开发研究专项(2012EG123032)
关键词
城市隧道
预加固措施
数值计算
变形规律
浅埋暗挖隧道
Urban tunnel
Pre-reinforcement measures
Numerical calculation
Deformation law
Shallow-buried excavation tunnel
