成都某h型双排桩支挡结构受力特征研究  

Mechanical Characteristics of a H-Type Double-Row Pile Retaining Structure in Chengdu

作　　者：孟宝华 马京京 章宁 邓宇 MENG Baohua;MA Jingjing;ZHANG Ning;DENG Yu(The Third Hospital of Mianyang,Sichuan Mental Health Center,Mianyang 621000;Mianyang City College,Mianyang 621000;Chengdu Surveying Geotechnical Research Institute Co.Ltd.of MCC,Chengdu 610023)

机构地区：[1]绵阳市第三人民医院四川省精神卫生中心基本建设科,四川绵阳621000 [2]绵阳城市学院,四川绵阳621000 [3]中冶成都勘察研究总院有限公司,成都610023

出　　处：《土工基础》2025年第1期17-23,共7页Soil Engineering and Foundation

基　　金：中冶成都勘察研究总院有限公司科研课题(ZYCK2021-003)。

摘　　要：结合“h型双排桩+锚索”段基坑监测数据,采用有限差分法对支护结构进行数值模拟,验证了模型合理性;进而从桩排间距、桩顶高差及桩底高差等方面进行分析优化,结果表明:排距小于5D(D为桩径)时,增加排距,桩身受力分布较为合理;随前后桩顶高差增大,后排桩分担弯矩和剪力增加,但后桩剪力最大值小于前桩,桩身剪力对桩顶高差敏感性小于弯矩。随桩底高差增大,后排桩弯矩和剪力急剧减小并出现不合理分布,前排桩有较大安全储备。研究结果可为复合式支护结构设计和施工提供借鉴。Combined with the monitoring data of the deep excavation and surrounding buildings during the construction,the nu-merical simulation of the H-type double row pile+ground anchor support was performed by using the FLAC3D to verify the validation of the model.Furthermore,the optimization is carried out from the aspects of double row pile row spacing,pile top height difference and pile bottom height difference,and reasonable advice are proposed to provide a reference for the design and construction of the composite support structure.

关 键 词：深基坑 变形监测 有限差分 异型双排桩 支挡结构 

分 类 号：TU473[建筑科学—结构工程]