摘要
【目的】针对预制混凝土桩在传统锤击沉桩施工中存在穿越硬土层困难、对周围土体扰动大等问题,以安罗高速罗山至豫鄂省界段工程为实例,探究桩板路基装配化施工中扩成孔植入预制混凝土桩代替锤击施工的可行性和实际应用价值。【方法】通过现场载荷试验和数值模拟,对比分析扩成孔植入预制混凝土桩与传统锤击打入预制混凝土桩的工作性状,深入探讨影响扩成孔植入预制混凝土桩承载性能的因素。【结果】扩成孔植入预制混凝土桩外围的复合水泥砂浆层能有效传递内部预制桩的荷载至周围土层,具有显著的扩径作用和对承载力的增强效果;内部预制桩与外围复合砂浆间相互作用良好,内部预制桩轴力随桩身逐渐降低,外围复合水泥砂浆轴力呈现出先增大后减小的变化趋势;复合水泥砂浆厚度和强度的提升能进一步提高扩成孔植入预制混凝土桩的整体承载性能。【结论】扩成孔植入预制混凝土桩的承载性能明显优于传统锤击打入预制混凝土桩的承载性能。桩板路基植入预制混凝土桩不仅提高了施工质量,还显著增强了桩身的承载能力和稳定性,为装配化施工提供了新的技术路径。
[Purposes]To address the problems such as difficulty in penetrating hard soil layers and large disturbance to the surrounding soil during the traditional hammering pile driving construction of precast concrete piles,the Anluo Expressway from Luoshan to the Henan-Hubei provincial boundary section project was taken as an example to explore the feasibility and practical application value of replacing hammering construction with implanted precast concrete piles in the assembly construction of pile-slab subgrade.[Methods]Through field load tests and numerical simulations,the working performance of implanted precast concrete piles and traditional hammering driven ones was compared and analyzed.The factors affecting the bearing capacity of implanted precast concrete piles were further discussed.[Findings]The composite cement mortar layer around the implanted precast concrete piles can effectively transfer the load of the internal precast concrete piles to the surrounding soil,exhibiting a significant diameter-enlarging effect and bearing capacity enhancement.There is a good interaction between the internal precast concrete piles and the surrounding composite mortar.The axial force of the internal precast concrete piles gradually decreases along the pile body.The axial force of the surrounding composite cement mortar tends to go up and then down.The increase in the thickness and strength of the composite cement mortar can further improve the overall bearing capacity of the implanted precast concrete piles.[Conclusions]The bearing capacity of the implanted precast concrete piles is significantly superior than that of the traditional hammering driven precast concrete piles.This technology improves not only the construction quality but also the bearing capacity and stability of the pile body,providing a new technical path for the assembly construction of pile-slab subgrade.
作者
郭付印
王世豪
李玉耀
郭子辉
GUO Fuyin;WANG Shihao;LI Yuyao;GUO Zihui(Henan Communications Planning&Design Institute Co.,Ltd.,Zhengzhou 451450,China;School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Henan Transport Investment Group Co.,Ltd.,Zhengzhou 450016,China)
出处
《交通科学与工程》
2025年第4期104-112,共9页
Journal of Transport Science and Engineering
基金
河南省交通运输厅科技项目(2021-2-14)
河南省重点研发与推广专项项目(科技攻关)(232102240026)
河南省住房与城乡建设科技计划项目(HNJS-2022-K45)。
