摘要
本文研究了粉土地层中矩形顶管施工时,始发深井端头的合理加固范围,重点分析加固长度对地表沉降(包括因加固引起的地面沉降)和围护结构变形的影响。通过数值模拟,探讨不同纵向加固长度(2、4、6、8、10 m)对横向地表沉降的作用,以及顶管破洞和顶进过程中隧道轴线方向地表竖向位移的变化。此外,还分析了不同加固长度对围护结构侧向变形的影响,特别是在破洞及连续顶进阶段的侧向位移特性。研究表明,4~6 m的加固长度可实现最佳效果,显著降低地表沉降和侧向位移,同时具备较高的经济效益。当加固长度超过6 m时,其对地表竖向位移的控制效果趋于减弱,甚至可能加剧地表扰动。建议在类似粉土地层的顶管工程中,根据实际情况选择4~6 m的纵向加固长度,以优化施工安全并降低成本。
The reasonable strengthening range of the initial deep well end during the construction of rectangular pipe jacking in the silty layer is studied,and the influence of reinforcement length on the surface settlement(including the ground settlement caused by reinforcement)and the deformation of the envelope structure is analyzed.Through numerical simulation,the effects of different longitudinal reinforcement lengths(2,4,6,8,10 m)on transverse surface settlement and the changes of surface vertical displacement along the tunnel axis during pipe jacking and jacking are discussed.In addition,the influence of different reinforcement lengths on the lateral deformation of the envelope is also analyzed,especially the lateral displacement characteristics during the breaking and continuous jacking stages.Studies have shown that a reinforcement length of 4 to 6 m can achieve the best results,significantly reducing surface settlement and lateral displacement,while providing high economic benefits.When the reinforcement length exceeds 6 m,the control effect of the reinforcement on the vertical displacement of the surface tends to weaken,and the surface disturbance may even be intensified.It is recommended to select 4 to 6 m longitudinal reinforcement length according to the actual situation in the pipe jacking project similar to the silty layer,in order to optimize construction safety and reduce cost.
作者
董航
马茂艳
陶述平
曹广勇
吴晓
储津
DONG Hang;MA Maoyan;TAO Shuping;CAO Guangyong;WU Xiao;CHU Jin(Anhui Province Key Laboratory of Building Structure and Underground Engineering,Anhui Jianzhu University,Hefei 230601,China;Anhui Shuian Construction Group Corporation,Hefei 230000,China)
出处
《四川轻化工大学学报(自然科学版)》
2025年第1期114-120,共7页
Journal of Sichuan University of Science & Engineering(Natural Science Edition)
基金
国家自然科学青年基金项目(52304073)
人工冻融作用下土体微观结构损伤与宏观力学特性研究基金项目(2022QDZ27)。
关键词
大断面矩形顶管
粉土地层
始发深井
数值模拟
端头加固
加固范围
large-section rectangular jacking pipe
silty soil stratum
starting deep well
numerical simulation
end reinforcement
reinforcement scope
