地下管廊深基坑回填土层沉降特征研究
Study on settlement characteristics of backfill soil layer in deep foundation pit of underground pipe gallery
李奉庭 1罗涛 2孙占勇 2武科 1肖文斌 1常昊 1许文彬 1刘大鹏1
作者信息
- 1. 山东大学 土建与水利学院,山东 济南 250061
- 2. 中国电建市政建设集团有限公司,天津 300384
- 折叠
摘要
为研究城市地下综合管廊回填后路面的沉降规律,依托雄安新区某管廊工程,运用现场回填土层沉降变形物联网智能监测与数值模拟计算方法,建立了综合管廊基坑回填施工过程的力学计算模型,对不同工况下的路面沉降与管廊结构的应力、应变情况进行分析.研究结果表明:1)回填土体的累积沉降量及各土层间的沉降差随着回填土层厚度的增大而增大.2)在阶梯法回填施工中,施工回填段数越多,路面沉降量及不均匀沉降程度越小,管廊结构变形越大.3)施工后的路面沉降量随着压实度的增大而显著减小.相关模拟方法与研究成果可为类似综合管廊回填工程的方案设计提供参考依据.
Abstract
In order to study the law of pavement settlement after backfilling of urban underground utility tunnel,based on a pipe gallery project in the Xiong'an New Area,in this study,the mechanical calculation model of foundation pit backfilling construction in utility tunnel was established by using the intelligent monitoring and numerical simulation calculation method of on-site backfill soil settlement and deformation,followed by analyzing the pavement settlement and the stress and strain of pipe gallery structure under different working conditions.The main conclusions are as follows:1)The cumulative settlement of backfill soil and the settlement difference between different soil layers increase with the increase of backfill soil thickness.2)During the step-by-step backfill construction process,the more backfill sections,the smaller the pavement settlement and uneven settlement,and the greater the deformation of the pipe gallery structure.3)After construction,the pavement settlement will decrease significantly with the increase of compaction degree.The relevant simulation method and research results can provide reference for the scheme design of similar backfill projects in utility tunnel.
关键词
地下管廊/回填土/沉降变形/现场监测/数值模拟Key words
underground pipe gallery/backfill soil/settlement deformation/field monitoring/numerical simulation引用本文复制引用
基金项目
国家自然科学基金面上项目(52179106)
出版年
2024
NETL
NSTL
万方数据