双线地铁开挖地表沉降预测及影响分析

发布时间：2018-08-14 17:11

【摘要】：各大中小城市通过开展地下交通工程缓解地面交通压力,但地铁路线多选在已建的市政道路下,故而必然对既有管线带来影响。有些管线被迫迁徙,但由于客观条件当其无法迁徙时,必须采取合理的施工方案约束地表和管线变形。以西安地铁3号区间隧道为研究对象,首先采取经验法计算单线隧道引发的地表沉降,然后基于叠加原理预测双线隧道对地表沉降曲线的影响,之后利用FLAC~(3D)模拟不同浅埋暗挖工艺对地表和既有管线变形的影响。理论分析及数值模拟结果均表明,双线隧道引发的地表沉降呈"U"型曲线分布,且沉降槽宽度影响范围和地表沉降均较单线大;有限元结果亦表明,环形开挖预留核心土法宜作为该区间隧道的施工方法。最后通过现场监测分析表明,该施工方法能有效降低地表沉降和管线变形,对黄土地区该类隧道工程具有一定的指导意义和借鉴价值。
[Abstract]:Large and medium-sized cities alleviate the pressure of ground traffic by developing underground transportation projects, but the subway routes are mostly selected under the built municipal roads, which will inevitably affect the existing pipelines. First, the ground settlement caused by single-track tunnel is calculated by empirical method, then the influence of double-track tunnel on the ground settlement curve is predicted based on the superposition principle, and then the influence of different shallow-buried and underground excavation technology on the ground surface and existing pipeline deformation is simulated by FLAC~ (3D). The results show that the surface settlement caused by the double-track tunnel is U-shaped, and the influence range of the width of the settlement trough and the surface settlement are larger than that of the single-line tunnel. The finite element results also show that the method of retaining core soil for circular excavation is suitable for the construction of the tunnel in this area. The deformation and deformation of the pipeline will have some guiding significance and reference value for the tunnel projects in the loess area.
【作者单位】：西安石油大学机械工程学院;
【基金】：国家自然科学青年基金资助项目(51405385) 陕西省教育厅专项科研计划项目(15JK1562) 西安石油大学博士科研启动项目(250205002)
【分类号】：P642.26;U231.3

【相似文献】