柱锤冲扩桩+CFG桩联合处置深厚垃圾杂填土地基的效果分析

Treatment Effects Analysis of Thick Waste Miscellaneous Fill Foundation by the Combination of Thrusted Expanded Pile and CFG Pile

北京某水工构筑物地基加固工程,首次采用柱锤冲扩桩+CFG桩二元桩联合处理深厚垃圾杂填土地基。结合此项目,分析了二元桩处置深厚垃圾杂填土地基的作用机理,并通过数值模拟计算,分析了深厚垃圾杂填土地基的二元桩处置效果。在此基础上,通过与只采用CFG桩地基处理方法的对比,总结了柱锤冲扩桩+CFG桩二元桩地基处理方法在深厚杂填土地基中的优势。结果表明:采用二元桩地基处理方法不仅减小了总体的地基以及桩基础沉降值,还减小了的不均匀沉降;同时减小了桩轴力值以及最大弯矩值,并能充分发挥各桩的作用,从而使荷载分配更为均匀。

In a foundation reinforcement project of a hydraulic structure in Beijing,it is the first time to use the thrusted expanded pile and the CFG pile to treat the thick construction waste miscellaneous fill foundation.Combined with this project,this paper analyzed the mechanism of binary pile in the treatment of thick construction waste miscellaneous fill foundation,and analyzed the treatment effects of binary pile through numerical simulation.On this basis,through the comparison with the foundation treatment methods only using CFG pile,this paper summarized the advantages of foundation treatment method by combination of the thrusted expanded pile and the CFG pile in thick construction waste miscellaneous fill foundation of hydraulic structures.The results show that the application of the binary pile foundation treatment method not only reduces the overall foundation settlement and pile foundation settlement,but also reduces the uneven settlement;at the same time,the axial force and the maximum bending moment of the pile are reduced,thus can take the full advantage of each pile,so that the load distribution is more uniform.