摘要
盾构施工对地层的扰动易引起地表沉降或隆起,危及地面建筑物安全。为合理预测盾构隧道施工引起的地表变形,考虑盾构隧道结构及施工工法特点,建立了考虑地层损失、盾构推力、盾壳摩擦力、注浆压力等作用下的纵向地表变形计算公式。基于西安市轨道交通市域线临潼线一期工程监测数据,对所提计算方法的合理性进行了验证。此外,利用该计算方法,探究了各因素对地表变形的影响规律。结果表明:地层损失是地表变形的主要因素,最大地表沉降发生在已支护段;地层损失对已支护或未开挖的地层影响范围随着地层损失率的增大而增大;盾构推力和摩擦力均会同时引起地表隆起和沉降,且变形曲线总体呈反对称分布;同步注浆会造成地表隆起,影响范围在注浆段前后20 m。
The disturbance of shield construction on stratum tends to cause surface subsidence or uplift,endangering the safety of ground buildings.To accurately predict the surface deformation,the characteristics of shield tunnel structure and construction method need to be considered.Then,considering stratum loss,shield thrust,shield shell friction and grouting pressure,the calculation formula of longitudinal surface deformation was established.Based on the monitoring data of Lintong Line Phase I project of Xi’an rail transit regional line,the rationality of the formula was verified.Using this calculation method,the influence of various factors on surface deformation was explored.The results show that:The stratum loss is the main factor of surface deformation,and the maximum surface settlement occurs in the supported section.The influence range of stratum loss on the supported or unexcavated strata increases with the increase of stratum loss rate.Both shield thrust and friction will cause surface uplift and settlement,and the deformation curve is generally distributed antisymmetric.Synchronous grouting can cause surface uplift,and the influence range is about 20 m in the grouting section.
作者
娄智普
Lou Zhipu(China Railway 21st Bureau Group Co.,Ltd.,Jinan 250000,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2023年第S01期149-154,共6页
Chinese Journal of Underground Space and Engineering
关键词
盾构隧道
施工期
地表变形
理论研究
参数分析
shield tunnel
construction period
surface deformation
theoretical research
parametric analysis
作者简介
娄智普(1988—),男,河南周口人,工程师,主要从事市政设施、地下工程等方面的施工与科研工作。E-mail:275585655@qq.com
