深基坑开挖时隔离桩位置对邻近既有地铁隧道的变形分析
发布时间：2018-08-12 11:34
【摘要】：深基坑开挖时周围土体的卸荷作用将引起邻近既有地铁隧道的变形,对其正常使用产生影响,隔离桩的位置控制隧道变形的效果值得研究。基于杭州市某房建地下室基坑工程采用隔离桩保护邻近既有地铁隧道的工程案例,采用ABAQUS有限元软件进行数值模拟,建立二维模型对隔离桩在不同位置条件下隧道的变形进行了分析。研究结果表明:基坑开挖最终引起隧道下沉约3.1 mm,隧道向靠近基坑方向水平位移约1.7 mm,数值模拟计算结果与现场实测数据的相关规律吻合;隔离桩距离隧道越近,基坑开挖对既有地铁隧道变形的影响越小。
[Abstract]:The unloading effect of soil around deep foundation pit excavation will cause deformation of adjacent existing subway tunnel, which will have an effect on its normal use. The effect of controlling tunnel deformation by the position of isolated pile is worth studying. Based on the case of a basement foundation pit project in Hangzhou City, which uses isolated piles to protect adjacent existing subway tunnels, the numerical simulation is carried out by using ABAQUS finite element software. A two-dimensional model was established to analyze the tunnel deformation of the isolated pile in different positions. The results show that the tunnel subsidence is about 3.1 mm and the horizontal displacement of tunnel is about 1.7 mm in the direction of foundation pit excavation. The results of numerical simulation are consistent with the field measured data, the closer the isolated pile is to the tunnel, the closer the tunnel is. The influence of excavation on the deformation of existing subway tunnel is smaller.
【作者单位】： 华东交通大学江西省岩土工程基础设施安全与控制重点实验室;浙江省工业设计研究院;浙江大学滨海和城市岩土工程研究中心;
【基金】：国家“973”计划(2015CB057801) 国家自然科学基金(51278449,51238009,51338009)资助
【分类号】：TU753;U231;U456.3
本文编号：2178927
[Abstract]:The unloading effect of soil around deep foundation pit excavation will cause deformation of adjacent existing subway tunnel, which will have an effect on its normal use. The effect of controlling tunnel deformation by the position of isolated pile is worth studying. Based on the case of a basement foundation pit project in Hangzhou City, which uses isolated piles to protect adjacent existing subway tunnels, the numerical simulation is carried out by using ABAQUS finite element software. A two-dimensional model was established to analyze the tunnel deformation of the isolated pile in different positions. The results show that the tunnel subsidence is about 3.1 mm and the horizontal displacement of tunnel is about 1.7 mm in the direction of foundation pit excavation. The results of numerical simulation are consistent with the field measured data, the closer the isolated pile is to the tunnel, the closer the tunnel is. The influence of excavation on the deformation of existing subway tunnel is smaller.
【作者单位】： 华东交通大学江西省岩土工程基础设施安全与控制重点实验室;浙江省工业设计研究院;浙江大学滨海和城市岩土工程研究中心;
【基金】：国家“973”计划(2015CB057801) 国家自然科学基金(51278449,51238009,51338009)资助
【分类号】：TU753;U231;U456.3
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