超期服役基坑的监测及数值分析
摘要:在工程建设期间,经常会出现由于设计调整、土地转让、建设方资金不足等情况,造成支护结构超期服役现象,从而增加工程风险,但是对其进行数值模拟分析目前比较少见。结合实际工程算例,运用有限元软件MIDAS,选择合理的本构模型,对基坑的支护结构进行了数值模拟。结果表明:基坑最终水平位移最大值出现在第2道锚杆处,且随着拉力减小,基坑的水平位移有所增大;基坑地表沉降和坑底隆起随着开挖深度增加而增大;锚杆轴力随着基坑开挖深度增大,轴力衰减范围为9%~37%,且轴力减小后衰减依然比较明显;数值结果与实测结果趋势相吻合,表明超期服役的基坑工程应引起必要的重视。
Abstract:During the engineering construction period,due to the design adjustment,land transfer,lack ot tunds and other reasons,the extended service of support structures often occurs,thereby increasing the risk of construction,but numerical simulation analysis about this is rare till today.Based on practical engineering example,by using the MIDAS software and choosing rea.sonable constitutive models,the numerical simulation for supporting structure for excavation is performed.The findings show that the final maximum horizontal displacement appears at the place of the second anchors,and decreases as the axial forces decrease.With the increase of excavation depth,the ground surface settlement and the bottom uplift of excavation increase at the same time.The decay of axial forces fluctuates from 9% to 37%,and the decay is still distinct after reducing axial forces.The result of numerical simulation coincides basically with that of measurement in the trend,showing that extended use of supporting structure should arouse people’s attention.
中文标题：
超期服役基坑的监测及数值分析
Measurements and Numerical Simulation of Extended Service Foundation Pit
作者：
张钦喜,吴浩,晁哲
Zhang Qinxi,Wu Hao,Chao Zhe
作者简介:张钦喜,男,1964年生,1985年毕收于长春地质学院工程地质学院工程专业,博士,正高级工程师,硕士生导师,主要从事地基基础及地下工程等方面的教学与研究。E-mail:qinxizhang@126.com
通讯地址：
北京工业大学建筑工程学院, 北京 100022
CollegeofArchitectureandCivilEngineering,BeijingUniversityofTechnology,Beijing100022,China
中图分类号:TV551.4
doi:10.3969/j.issn.1007-2993.2017.04.006
出版物：岩土工程技术
收稿日期:2017-05-02
网络出版日期:2021-07-06
关键词:基坑支护,超期服役,锚杆,数值模拟,稳定性评价
Key words:supporting structure,extended use,anchor,numerical simulation,stability evaluation
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