湿陷性黄土地区建筑地基加固研究  

Study on Building Foundation Reinforcement in Collapsible Loess Area

作　　者：熊维 柳旻 何淼 李昌饶 XIONG Wei;LIU Min;HE Miao;LI Changao(China JiKan Research Institute of Engineering Investigations and Design Co.Ltd.,Xi'an Shaanxi 710021,China;Shaanxi Key Laboratory of Special Geotechnical Properties and Treatment,Xi'an Shaanxi 710021,China;Xi'an Engineering Investigation and Design Research Institute of China National Non-Ferrous Metals Industry,Xi'an Shaanxi 710054,China)

机构地区：[1]机械工业勘察设计研究院有限公司,陕西西安710021 [2]陕西省特殊岩土性质与处理重点实验室,陕西西安710021 [3]中国有色金属工业西安勘察设计研究院有限公司,陕西西安710054

出　　处：《铁道建筑技术》2024年第12期141-145,共5页Railway Construction Technology

基　　金：陕西省创新能力支撑计划项目(2023-CX-TD-34,2022-KJXX-05,2023-CX-PT-46);国机集团青年科技基金项目(QNJJ-PY-2022-41,QNJJ-ZD-2022-17);西安市英才计划青年项目(2022XAYC-03);自然资源部陕西西安地裂缝与地面沉降野外科学观测研究站开放课题(2022-02);长安大学中央高校基本科研业务费专项资金资助(300102263512)。

摘　　要：SDDC工法在湿陷性黄土地区使用较为普遍,当场地含水率超过最优含水率时,SDDC工法挤密桩桩身挤密系数、桩间土和三桩中心挤密系数达不到设计要求时,受外界水源浸入后容易造成建筑地基沉降量大、产生不均匀沉降,甚至引起严重的建筑工程安全质量问题。本文以西安地区某工程为实例进行分析,当SDDC工法处理不当产生不均匀沉降时,需对建筑地基进行加固处理,采用坑式静压桩(钢管桩)处理后,地基加固后沉降变形监测结果表明,最后100 d内的最大平均沉降速率为0.01 mm/d,满足现行国家规范限值要求,建筑物地基基础处于稳定状态。SDDC construction method is widely used in collapsible loess area.When the site moisture content exceeds the optimal moisture content,the compaction coefficient of pile body,soil between piles and three pile centers by SDDC construction method cannot meet the design requirements.After being immersed by external water sources,it is easy to cause large settlement of building foundation and uneven settlement,and even cause serious safety and quality problems of construction projects.This paper takes a project in Xi′an as an example for analysis,when uneven settlement is caused by improper treatment of SDDC construction method,the building foundation needs to be strengthened,and the pit-jacked static pressure pile(steel pipe pile)treatment scheme is adopted.The monitoring results of settlement deformation after foundation reinforcement show that the maximum average settlement rate in the last 100 d is 0.01 mm/d,which meets the limit requirements of the current national code,and the foundation of the building is in a stable state.

关 键 词：湿陷性黄土 SDDC工法 不均匀沉降 加固处理 坑式静压桩 

分 类 号：TU444[建筑科学—岩土工程] TU472[建筑科学—土工工程]