砂卵石地层大直径盾构侧穿筏板基础建筑沉降控制技术研究  

Research on settlement control technology of large diameter shield side penetrating raft foundation building in sand and gravel stratum

作　　者：侯宏平 张振雨 张小杰 成宣任 郑余朝[2] Hou Hongping;Zhang Zhenyu;Zhang Xiaojie;Cheng Xuanren;Zheng Yuchao(Railway Transportation Branch,China Railway 24 Bureau Group Corporation,Shanghai 200070,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]中铁二十四局集团有限公司轨道交通分公司,上海200070 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《山西建筑》2024年第18期169-173,共5页Shanxi Architecture

基　　金：中铁二十四局集团技术开发重点课题(CDDT17-2023-JS-1)。

摘　　要：为探究砂卵石地层大直径盾构侧穿筏板基础建筑过程中的沉降控制技术,依托成都轨道交通17号线二期龙爪堰站—清水河大桥站—浣花里站区间隧道施工项目,结合监测数据和施工参数,建立精细化数值模型对盾构施工过程进行了模拟。盾构侧穿后,右侧基础沉降较大导致建筑结构重心向右侧偏移,进而导致地下室中间柱竖向压应力明显增大。盾构侧穿过程中筏板基础建筑更容易出现向盾构一侧的整体倾斜,且建筑远离盾构一侧甚至可能出现轻微隆起。针对侧穿筏板基础建筑的盾构施工,建议特别关注建筑物的倾斜率,并考虑采用地层注浆加固和隔离桩施工方法以减小沉降。In order to investigate the settlement control technology during the side penetration of large-diameter shield structure into raft foundation building in sand pebble stratum,relying on the construction project of Longjiaoyan Station—Qingshuihe Bridge Station—Runhuali Station Interval Tunnel of Chengdu Railway Transportation Line 17 Phase II,a refined numerical model was established to simulate the shield construction process by combining the monitoring data and construction parameters.After the shield tunneling,the settlement of the right side foundation is large,which causes the center of gravity of the building structure to be shifted to the right side,which in turn leads to a significant increase in the vertical compressive stress in the middle column of the basement.In the process of shield side penetration,the raft slab foundation building is more likely to have an overall tilt to the shield side,and the building may even have a slight bulge on the side away from the shield.It is recommended to pay special attention to the tilt rate of the building and consider the use of ground grouting reinforcement and isolation piles to minimize the settlement for the shield construction of the side penetration of the raft slab foundation building.

关 键 词：大直径盾构 砂卵石地层 侧穿建筑物 筏板基础 

分 类 号：TU997[建筑科学—市政工程] U455[建筑科学—桥梁与隧道工程]