介绍了单壁螺纹 PVC 塑料套管现浇混凝土桩(TC 桩)的组成、特点、施工设备、施工流程及检 测方法,结合申嘉湖杭高速公路练市至杭州段 TC 桩处理的软基工程,通过埋设土压力盒和钢筋应 力计,比较分析了路堤荷载下桩帽顶上应力、桩帽间及桩帽下土应力的分布及变化规律,得出了桩土 应力比、荷载分担比随填筑荷载的变化曲线。 结果表明:随着填筑高度的增加,路堤荷载逐渐向 TC 桩 转移,桩间土应力先增大后减小;在检测期内, 关键词:混凝土桩;软土地基处理;承载性能;T桩C土桩应的力桩比土;应现力场比试与验荷载分担比始终趋于增大。 中图分类号:TU473 文献标志码:A 文章编号:1006 7647(2016)01 0066 05 Single鄄wall corrugated PVC plastic tube鄄based cast鄄in鄄place concrete pile technology and field tests/ / QI Changguang1 , GUO Wei2 , CUI Yunliang3 ( 1. Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China; 2. Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan 430010, China; 3. City College, Zhejiang University, Hangzhou 310015, China) Abstract: The composition, characteristics, construction equipment, construction process, and quality inspection method of cast鄄in鄄place concrete piles (TC piles), with single鄄wall corrugated PVC plastic tubes used in the construction process, are introduced. In combination with the soft foundation project of the Lianshi鄄Hangzhou section of the Shen鄄Jia鄄Hu鄄Hang Expressway reinforced by TC piles, the distribution and variation of the soil stress on the top of pile caps, and that between and under pile caps were compared and analyzed based on observations by embedded earth pressure cells and rebar stress meters. Variation curves of the pile鄄soil stress ratio and load sharing ratio against the filled load were obtained. The results show that the embankment load is gradually transferred to TC piles, and the pile鄄soil stress ratio increases first and then decreases as the height of embankment is increased. During the measurement period, the pile鄄soil stress ratio and load sharing ratio of TC piles tend to increase. Key words: concrete pile; soft ground treatment; bearing behavior; pile鄄soil stress ratio; field test 随着我国东南沿海软土地区高速公路的建设, 各种软基处理方法不断应用到实际工程中,如真空 堆载预压法、排水固结法、柔性桩复合地基、刚性桩 复合地基等,其中以刚性桩复合地基为代表的桩承 式软基处理方法以其单桩承载力好(与柔性桩相 比)、地基处理效果更加显著(与排水固结法相比)、 施工速度快(与真空、堆载预压法相比)等特点得到 广泛的使用[1鄄5] 。 单壁螺纹 PVC 塑料套管现浇混凝土桩(以下简 称 TC 桩)是在借鉴国外 AuGeo 桩先进技术和国内 沉管灌注桩技术的基础上改进而发展起来的一种新 型软基处理技术[6鄄8] ,并申请了多项专利[9鄄11] ,有效 解决了江浙两省软土地区高速公路的地基处理问 题,同时提升了高速公路的施工速度和质量,丰富了 我国的软基处理技术。 本文介绍 TC 桩的组成及特点、施工设备及工 艺和质量检测方法,并结合实际工程试验研究了 TC 桩在工作荷载下的荷载分担比、桩土应力比随填土 高度的变化规律。 1 TC 桩的组成和特点 TC 桩是由钢筋混凝土预制桩尖、单壁螺纹 PVC

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