双排桩冠梁刚度分析及抗倾覆优化计算  

Stiffness analysis on crown beam with double-row piles and the anti-overturning optimization calculation

作　　者：刘青松[1] 矫伟刚[1] 盛志战 Liu Qingsong;Jiao Weigang;Sheng Zhizhan(BGI Engineering Consultants Ltd.,Beijing 100038,China)

机构地区：[1]北京市勘察设计研究院有限公司,北京100038

出　　处：《工程勘察》2020年第6期19-23,共5页Geotechnical Investigation & Surveying

摘　　要：双排桩支护体系的受力机理、计算模型等尚不是非常明确,现有规范中的关键参数的选取对双排桩计算影响较大,其应用受到一定限制。以北京西北五环外某基坑支护工程为例,基于理正深基坑支护软件,探讨了双排桩冠梁水平侧向刚度对支护体系变形的影响,并提出了考虑连梁作用的双排桩冠梁水平侧向刚度的建议计算方法,最终根据工程监测数据的反分析,给出了双排桩冠梁水平侧向刚度的建议取值范围。合理考虑后排桩和土体之间的摩阻力产生的力矩对双排桩抗倾覆的有利作用,提出了双排桩抗倾覆优化计算公式。本文的双排桩水平侧向刚度的合理取值和双排桩抗倾覆的优化计算为双排桩的设计提供了有价值的参考。The mechanical mechanism and calculation model for the double-row piles support system are not very clear,the selection of key parameters in existing codes has a great influence on the calculation,and the application of double-row piles is limited.By taking the design of certain foundation pit bracing beyond the West Fifth Ring Road in Beijing as an example,the effect on the deformation to the support system of the horizontal lateral stiffness with double-row piles crown beam is discussed,and the calculation method for the horizontal lateral stiffness of double-row piles crown beam considering the effect of connecting beams is put forward.Finally,the recommended range of horizontal lateral stiffness of doublerow piles crown beams is given based on the back analysis with the engineering monitoring data.Considering the beneficial effect of the moment produced by the friction between the back row piles and the soil on the anti-overturning of the double row piles,an optimum formula for the anti-overturning calculation of the double-row piles is proposed.In this paper,the reasonable values of horizontal lateral stiffness and the anti-overturning optimal calculation provide the valuable reference for the design.

关 键 词：双排桩 水平侧向刚度 抗倾覆 

分 类 号：TU753.1[建筑科学—建筑技术科学] TU473