灌注桩和搅拌桩联合支护在软土基坑工程中的应用  

Application of Combined Support of Cast-in-place Pile and Mixing Pile in Soft Soil Foundation Pit Engineering

作　　者：靳炎 冯少杰[1] JIN Yan;FENG Shaojie(North China University of Technology,Beijing,100144,China)

机构地区：[1]北方工业大学,北京100144

出　　处：《工程建设（维泽科技）》2021年第8期83-88,共6页Engineering Construction

基　　金：国家重点研发计划项目“设施危险监控与滑坡早期预警标准研究”(2018YFF0213304);国家自然科学基金(41772335)、(51774184)、北方工业大学高水平特色大学重点科学研究方向(2020-2025)。

摘　　要：软土地基深基坑支护一直是岩土工程领域关注的难点问题,软土具有含水量大、高压缩性、强度低、承载力小,蠕变等特点,导致软土区域深基坑开挖问题复杂多变,基坑事故频发。文中以某基坑工程支护为例,综合考虑软土地基、周边既有建筑物、工期要求等影响条件,确定采用搅拌桩与灌注桩联合支护方式,并对支护结构进行了有限元数值模拟。结果表明,该支护结构能够充分利用搅拌桩墙成拱承压和灌注桩的抗弯、抗剪的性能,保证基坑工程安全,为同类工程应用提供了借鉴。Deep foundation pit support in soft soil foundation has always been a difficult problem in the field of geotechnical engineering.Soft soil has the characteristics of large water content,high compressibility,low strength,small bearing capacity and creep,which leads to complex and changeable deep foundation pit excavation problems in soft soil area and frequent foundation pit accidents.Taking the support of a foundation pit as an example,considering the influence conditions such as soft soil foundation,surrounding existing buildings and construction period requirements,the combined support mode of mixing pile and cast-in-place pile is determined,and the finite element numerical simulation of the support structure is carried out.The results show that the support structure can make full use of the arch bearing of mixing pile wall and the bending and shear resistance of cast-in-place pile,so as to ensure the safety of foundation pit engineering,which provides a reference for the application of similar projects.

关 键 词：软土地基 深基坑支护 搅拌桩 灌注桩 

分 类 号：TV223.22[水利工程—水工结构工程]