防灾减灾工程学报2025，Vol.45Issue(2)：436-445,10.DOI:10.13409/j.cnki.jdpme.20231024003
接杆粉喷桩施工工艺及参数对成桩质量影响研究
Research on the Influence of Construction Technology and Parameters of Rod-Extended Deep Mixing Piles on Pile Formation Quality
摘要
Abstract
To investigate the influence of construction technology and parameters of rod-extended deep mixing piles on the pile formation quality,a typical soft soil site along the Liansu Expressway was se-lected for field trial piling.Ground improvement was conducted using rod-extended deep mixing piles with varying construction parameters and methods.Following pile formation,standard penetration tests(SPT),core recovery tests,and 28-day unconfined compressive strength(UCS)tests were con-ducted to evaluate pile quality and identify the optimal construction method and parameters.The test results showed that a top-down construction method,with a blade rotation speed of 60r/min,drilling and lifting speed of 1.0m/min,and a cement content of 80kg/m,was well-suited for marine silty soil in Lianyungang.In practical engineering applications,construction parameters should be combined and matched based on site-specific geological conditions and the empirical formula for the number of mixing passes per soil layer.Ensuring that the soil at any point within the reinforcement zone is mixed at least 25 times contributes to achieving better pile formation quality and ground improvement effects.Although conventional deep mixing piles typically demonstrate higher pile quality due to the absence of complex processes such as rod coupling and decoupling,rod-extended deep mixing piles still meet the required technical specifications.Therefore,under construction conditions with height limitations,rod-extended deep mixing piles can serve as effective substitutes to conventional piles,meeting strength requirements and achieving satisfactory engineering performance.关键词
接杆式搅拌桩/施工工艺/施工参数/成桩质量Key words
rod-extended deep mixing pile/construction technology/construction parameters/pile for-mation quality分类
土木建筑引用本文复制引用
施金涛,江舜根,王建业,章定文,刘华,于志龙,杨松松..接杆粉喷桩施工工艺及参数对成桩质量影响研究[J].防灾减灾工程学报,2025,45(2):436-445,10.基金项目
江苏省研究生科研与实践创新计划项目(KYCX22_0268)资助 （KYCX22_0268）
