摘要
研究目的:以北京地铁八号线某区间隧道盾构工程为依托,采用FLAC模拟预测盾构施工引起的地表及其附近建筑物的变形规律,为盾构隧道施工安全通过地表建筑物时的合理施工参数确定和现场监测方案的制定提供技术支撑。研究结论:(1)采用数值模拟得到北京地铁隧道盾构施工引起的地表变形规律,地表横向沉降曲线在水平方向上基本对称,建筑物对其周围区域地表变形影响较大,对其所在区域地表变形影响相对较小,最大差异沉降为8,09 mm;(2)数值模拟预测结果表明两隧道开挖对地表影响的范围主要在两隧道中心左右各36 m,开挖面影响区域为开挖面前方24 m及开挖面后方20 m范围内,施工时应重点监测;(3)实践表明实测曲线与数值模拟曲线吻合较好,数值模拟是预测盾构施工对地表及邻近建筑物变形影响规律的有效手段;(4)研究成果可用于地铁盾构施工对地表邻近建筑物的变形控制方案的制定。
Research purposes： Based on the shield engineering of some interval tunnel in Beijing subway line eight, it used FLAC simulation to predict the deformation laws of surface and its nearby building caused by shield construction, the goal is to offer a technological support for the determination of reasonable construction parameters and the establishment of the on - site monitoring project when safety through surface buildings in shield tunnel construction. Research conclusions：（ 1 ） Numerical simulation was adopted to investigate the laws of surface deformation caused by the tunnel shield construction of Beijing subway, the lateral ground settlement curve is basically symmetrical in horizontal direction, and buildings have greater influence on surface deformation on the surrounding area compared with its region. The maximum differential settlement is 8.09mm. （2） According to the prediction results of numerical simulation, the bi- directional tunnel excavation affected range of surface is 36m that mainly in tunnel center. The excavation face affected area is 24m in the frontage and 20 m in the rear, so it should be mainly monitored during construction. （3） The practice shows that the measured curves are identical with the simulation curves. The numerical simulation is effective means for predicting the laws of surface and adjacent building deformation caused by shield construction. （4） The research results can be used to make adjacent building deformation control scheme caused by shield construction.
出处
《铁道工程学报》
EI
北大核心
2014年第1期69-74,共6页
Journal of Railway Engineering Society
基金
陕西省教育厅自然科学专项(2010JK667)资助
关键词
地铁隧道
盾构施工
地表变形
建筑物
控制措施
metro tunnel
shield construction
surface deformation
building
control measures
