湿陷性黄土地区大型圆形沉井及顶管施工对周围环境的影响  

Influence of Large Circular Caisson and Pipe Jacking Construction on Surrounding Environment in Collapsible Loess Area

作　　者：孙磊 孙凯 李兆吉 庞应科 司达非 王晓鹏 SUN Lei;SUN Kai;LI Zhaoji;PANG Yingke;SI Dafei;WANG Xiaopeng(West Airport Group Construction Engineering Xi’an Co.,Ltd.,Xi’an,Shaanxi 710082,China;West Airport Group Airport Construction Headquarters,Xianyang,Shaanxi 712035,China;Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China)

机构地区：[1]西部机场集团建设工程西安有限公司,陕西西安710082 [2]西部机场集团有限公司机场建设指挥部,陕西咸阳712035 [3]西安建筑科技大学,陕西西安710055

出　　处：《施工技术（中英文）》2023年第4期19-23,43,共6页Construction Technology

基　　金：西部机场集团建设工程(西安)有限公司科研项目:西安咸阳国际机场三期扩建雨水外排工程综合施工关键技术(20220060)。

摘　　要：根据湿陷性黄土地区西安咸阳国际机场三期扩建雨水外排工程大型圆形沉井结构特点、沉井周边的加固设计及工程地质条件,结合现场沉降监测控制点的实测数据,采用有限元软件PLAXIS建立三维计算模型,分析沉井及顶管施工过程中周围地表沉降,以研究沉井及顶管施工对周边临近构筑物的影响。计算结果表明:沉井周边地表沉降随下沉深度增大而增加,沉井封底完成后测点的沉降理论值与实际测试值较吻合,一般测试值较计算值稍大;在临近构筑物沉降控制测点二者差值为0.7mm;黄土地区顶管施工对周边重要构筑物的影响满足保护要求。According to the structural characteristics, the reinforcement design and engineering geological conditions around the caisson of the large circular caisson of Xi’an Xianyang International Airport Phase III extension rainwater drainage project in collapsible loess area, combined with the measured data of the on-site settlement monitoring control points, the finite element software PLAXIS was used to establish a three-dimensional calculation model to analyse the settlement of the surrounding ground surface during the construction of the caisson and pipe jacking in order to study the impact of the construction of the caisson and pipe jacking on the surrounding adjacent structures. The calculation results show that the surface settlement around the caisson will increase with the sinking depth. After the completion of the bottom sealing of the caisson, the theoretical settlement value of the measuring point is in good agreement with the actual measured value, and the measured value is slightly larger than the calculated value generally. The difference between the two is 0.7mm at the settlement control measuring point near the structure. The finite element analysis of pipe jacking on the surrounding environment shows that the impact of pipe jacking on the surrounding important structures in loess region meets the protection requirements.

关 键 词：湿陷性黄土 沉井 顶管 施工技术 沉降 监测 

分 类 号：TU753[建筑科学—建筑技术科学]