摘要
顶管掘进断面为软弱地层,不易控制顶管姿态,研发了工具管姿态可调整顶进系统,将试验段的高程偏差和中线偏差分别控制在-16~6mm和2~16mm。针对阻碍工具管切土顶进的废弃管道,研发了大直径人工顶管可伸缩式主动支护装置,为顶进前方地下障碍物的清除施工提供安全的作业空间。研究结果表明,顶管施工时地表沉降受注浆压力影响,注浆压力取0.1MPa时,地表沉降控制效果良好;沿顶管顶进方向,地表沉降位移逐渐增大并趋于稳定;沿水平方向,地表的横向位移沉降曲线呈正态分布,且顶管顶进对土体的横向扰动范围为-10~10m。顶管施工时,地面行车荷载对土层的横向位移影响不大,但加剧了土层的竖向位移,端头注浆加固可以改善土层软弱特质。
Aiming at the difficulty of controlling the jacking attitude during the jacking process due to the weak stratum such as silt fill,fine silt and silt,a tool pipe attitude adjustable jacking system was developed to control the elevation deviation and midline deviation of the test section within-16~6mm and 2~16mm respectively.A large-diameter manual pipe jacking active retractable support device was developed to provide a safe working space for the removal of underground obstacles in front of the jacking.The numerical simulation results show that the surface settlement is affected by the grouting pressure during pipe jacking construction.When the grouting pressure is 0.1MPa,the surface settlement control effect is good.Along the jacking direction,the ground settlement displacement increases gradually and tends to be stable.The lateral displacement and settlement curve of the surface along the horizontal direction presents a normal distribution law,and the lateral disturbance range of the soil is-10~10m.During pipe jacking construction,the driving load on the ground has little effect on the lateral displacement of the soil layer,but aggravates the vertical displacement of the soil layer.
作者
杨富强
江慧
施笋
姚韦靖
YANG Fuqiang;JIANG Hui;SHI Sun;YAO Weijing(Beijing Uni-Construction Group Co.,Ltd.,Beijing 100101,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China)
出处
《施工技术(中英文)》
2025年第22期55-60,共6页
Construction Technology
基金
安徽省住房城乡建设科学技术计划(2023-YF048)
安徽省博士后科研项目(2024C943)
淮南市科技计划(2023A313)。
关键词
地下工程
顶管
软弱地层
障碍物
沉降
数值模拟
注浆压力
underground engineering
pipe jacking
weak strata
obstacle
settlement
simulation
grouting pressure
