预应力低碳工法桩技术与基坑工程应用 English Version
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摘要: 近年来，我国基坑工程建设规模空前，消耗大量材料并产生大量渣土，如何降低基坑工程造价、减少资源浪费是基坑工程领域面临的挑战。工法桩作为高效的基坑支护方式，近年来得到了新的发展，在浅基坑工程中得到了大量应用。本文提出了预应力低碳工法桩（PMW）技术，该技术采用预成孔灌注流态固化渣土成桩，再插入体外预应力型钢，通过施加预应力提高工法桩抵抗变形的能力。针对该新型工法桩技术，开展了PMW室内加载试验，揭示了PMW的变形内力随预应力的变化规律，推导了PMW变形内力的理论计算公式，并将该技术在现场进行工程应用。结果表明，随预应力的增加，型钢向作用力方向的变形明显减小，甚至出现“0”变形，预应力钢绞索轴力增长量与预应力无关；现场应用效果表明，PMW具有较强的控制变形能力，可减少支撑或取消支撑，大幅降低工程造价和施工工期，并消纳工程渣土，具有显著的低碳经济环保优势，具有广泛的推广应用前景。Abstract: In recent years, the scale of foundation pit construction in China has expanded unprecedentedly, resulting in substantial material consumption and significant waste generation. A major challenge in the field of pit engineering is finding ways to reduce costs and minimize resource wastage. As an efficient support method, construction piles have seen significant development and have been extensively used in shallow pit projects. This paper proposes a new technique, Prestressed Mixing Wall (PMW) technology, which uses cured residue to form piles and inserts prestressed shaped steel to enhance resistance to deformation. Indoor loading experiments are conducted to investigate the deformation and internal force behavior of this new technology. Theoretical formulas are derived, and field applications validate the technology's effectiveness. The results show that as prestress increases, the deformation of the shaped steel in the direction of the applied force decreases significantly, even achieving "zero" deformation. Furthermore, the axial force of prestressed steel strand remains unaffected by prestress. Field applications demonstrate that PMW technology offers strong deformation control capabilities, reduces or eliminates the need for additional support, mitigates the disposal of engineering residue, significantly lowers project costs and construction durations, and provides low-carbon, environmentally friendly benefits. This technology has promising potential for widespread application.
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Keywords:
- prestressed /
- fluid solid soil /
- construction pile /
- deformation /
- axial force /
- foundation pit support
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