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盾构近距离下穿桥梁数值分析与监测 预览 被引量:1

Numerical Analysis and Monitoring Research on Shield Passing through Bridge at Close Range
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摘要 目的分析盾构掘进施工对桥桩的影响,评估盾构掘进对桩体位移、桩身轴力、弯矩等的影响程度.方法以石家庄轨道交通1号线下穿周汉河桥段为例,采用三维数值模拟的方法建立双线盾构穿越桥梁桩基础模型,对盾构掘进施工过程中所引起的桩基础的位移和内力进行分析,以数值分析为基础制定合理的监测方案,对盾构掘进穿越桥梁基础进行现场监测.结果盾构施工造成的桥桩应力变大,1号桩最大应力为0.86 MPa,2号桩最大应力为1.96 MPa远小于设计值22.4 MPa;左线盾构掘进完成后,地表的最大沉降为5 mm,右线盾构掘进完成后,地表最大沉降为10.2 mm;桥桩的最大水平位移为2.6 mm,其中2号桥桩的沉降最大,为9.35 mm;下穿周汉河桥桩段路面最大下陷值为6.9 mm,3处桥梁桩顶沉降分别为5.78 mm、5.51 mm和5.43 mm,小于施工限值12 mm.结论数值模拟计算结果与现场实测数据的结果符合较好,说明模拟计算时所建立的数值模型与相关物理力学计算参数的确定是合理可靠的. The influence of shield tunneling on bridge piles is analyzed to evaluate the effect of shield tunneling on pile displacement,pile axial force and moment.Taking Shijiazhuang Rail Transit Line 1 at Zhouhan Bridge section as an example,a three-dimensional numerical simulation method is used to establish a double-shield tunneling through the bridge pile foundation model.The displacement and internal forces of the pile foundation caused by shield tunneling are analyzed.Based on the numerical analysis,a reasonable monitoring scheme is established,and the on-site monitoring is carried out during the shield driving through the bridge foundation.The stress of bridge pile caused by shield construction becomes larger,the maximum stress of pile 1 is 0.86 MPa,and the maximum stress of pile 2 is 1.96MPA,which is much smaller than the designed value of 22.4 MPa.After the completion of the left shield tunneling,the maximum settlement of the earth′s surface is 5 mm.After the completion of the right shield tunneling,the maximum settlement of the earth′s surface is 10.2 mm.The maximum horizontal displacement of bridge piles is 2.6 mm,and the bridge pile with the maximum settlement that is 9.35 mm is No.2.The maximum subsidence of the pavement beneath the Zhouhan river bridge is 6.9 mm.The settlement of the top of three bridges is 5.78 mm,5.51 mm and 5.43 mm,respectively,which are less than the construction limit of 12 mm.The result of numerical simulation is in good agreement with the field measured data,which shows that the numerical model established on simulation calculation and the parameters determination of related physical and mechanical calculation are reasonable and reliable.
出处 《沈阳建筑大学学报:自然科学版》 CSCD 北大核心 2018年第2期247-256,共10页 JOURNAL OF SHENYANG JIANZHU UNIVERSITY NATURAL SCIENCE
基金 国家自然科学基金项目(41672259) 河北省科技计划项目(16215408D)
关键词 地铁 盾构施工 下穿桥梁 数值模拟 现场监测 subway shield construction under the bridge numerical simulation site monitoring
作者简介 尚艳亮(1980—),男,副教授,博士研究生,主要从事岩土与地下工程研究.
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