“二元”基坑中内支撑支护结构的三维数值分析与监测

3D Numerical Analysis and Monitoring of Foundation Pit Inner Supporting Structure with the "Soil-Rock" Dualistic Structure

排桩与内支撑相结合的基坑支护结构是近几年兴起并迅速发展的1种支护方式。如何通过有效控制其变形使基坑工程安全又经济,是人们不断探索的课题。本文以青岛地区某实际深基坑为研究对象,运用理正深基坑三维协同计算对基坑开挖、支护进行了整体计算。对内支撑的平面布置进行分析,提出了水平桁架式、大直径环撑辐射式、多跨压杆式不同的支撑样式对基坑的整体受力及变形的影响参考值。对本工程内支撑的支撑间距进行分析,提出了合理的支撑间距值。另外,依据有关规定制定了监测方案,对监测结果进行了整理,并与理论计算值进行比对分析,得出一些有价值的结论,可以为类似工程的设计、施工和监测提供一些借鉴。

The types that supporting structure of piles and internal support are rose and developed rapidly in recent years.How to effectively control deformation of foundation pits and make foundation pit engineering safe and economical is the task that people always problem.On the ground of deep foundation pit retaining structure engineering in Qingdao earea,the overall computing is carried out for the process of excavation and supporting.As for the the layout of internal support,the whole stress and the displacement of the lever structure type support,large diameter ring radiant support,many cross lever type support of the pit are the two main influencing factors to be analyzed,with the aim of proposing appropriate parameters of the two factors.As for the practical engineering internal support,the distance is the main influencing factors to be analyzed,with the aim of proposing appropriate parameters of the two factors.At the same time,a monitoring program for it excavation is developed in accordance with the relevant specifications after analyzing the monitoring results and comparing hose with the theoretical results.Get some useful conclusions.It is useful for design,construction and monitoring of similar engineering.