深基坑无撑双排桩围护结构变形分析与监测

Deformation Analysis and Monitoring of Supportless Double-row Pile Retaining Structure in Deep Foundation

深基坑无横撑双排桩支护结构具有承载不利、桩土相互作用十分复杂的特点,在施工时应进行专项分析和监测。文章以铜陵市火车站下穿工程为例,通过模型简化,采用理正软件分析了围护桩的受力变形特征,掌握了围护结构的安全系数,为制定施工监控方案和确定安全控制指标提供了依据。并以此为基础,通过对该基坑施工过程进行全面监测,及时掌握了围护结构的安全状态,验证了理论计算的可靠性,科学预警、分析并处治了异常险情。相关研究成果可供类似无撑双排桩围护结构的研究和工程实践参考。

The braceless double-row pile supporting structure of deep foundation pit has the characteristics of unfavorable bearing and complex pile-soil interaction, which needs the special analysis and monitoring during construction.With the under-crossing project of Tongling City Railway Station as an example,and through model simplifying, this article analyzed the force deformation characteristics of retaining pile by means of Lizheng sof[ware,and mastered the safety factor of retaining structure,thus providing the bases for formulating the construction monitoring plan and determining the safety control index.Based on this,through comprehensively monitoring the construction process of this foundation pit, it timely mastered the safety status of retaining structure and verified the reliability of theoretical calculation, and scientifically early warned, analyzed, and treated the abnormal situation.The related research results can provide the reference for the research and engineering practice of similar supportless double-row pile retaining structure.