天津厚地层超长钻孔灌注桩单桩承载特性研究

›› 2011, Vol. 32 ›› Issue (9): 2821-2826.

天津厚地层超长钻孔灌注桩单桩承载特性研究

柯洪¹，吴翔²，王继华¹，曾云川³，赵春宏¹，冯庆高⁴

1. 云南省电力设计院勘测部，昆明 650051；2. 中国地质大学工程学院，武汉 430074； 3. 云南交通规划设计院工程勘察分院，昆明 650051；4. 新疆大学地质与勘查工程学院，乌鲁木齐 830047

收稿日期:2011-02-22 出版日期:2011-09-10 发布日期:2011-09-13
作者简介:柯洪，男，1984年生，硕士，工程师，主要从事岩土工程与地质工程方面的研究工作

Research on vertical bearing capacity of single super-long bored pile in thick stratum of Tianjin

KE Hong¹，WU Xiang²，WANG Ji-hua¹，ZENG Yun-chuan³，ZHAO Chun-hong¹，FENG Qing-gao⁴

1. Survey Department, Yunnan Electric Power Design Institute, Kunming 650051, China; 2. Engineering Faculty, China University of Geosciences, Wuhan 430074, China; 3. Engineering Investigation Branch, Yunnan Provincial Communications Planning and Design Institute, Kunming 650051, China; 4. Geology and Exploration Engineering College, Xinjiang University, Urumqi 830047, China

Received:2011-02-22 Online:2011-09-10 Published:2011-09-13

摘要/Abstract

摘要： 天津市某主塔楼桩基选用后压浆超长钻孔灌注桩，为了掌握超长后压浆钻孔灌注桩在该地层的工程特性，共设计了2组（共8根）试桩进行单桩竖向抗压静载试验。试桩中安装了振弦式钢筋计和分层沉降管以反映桩侧摩阻力和桩身分层沉降状态。对试验数据进行对比分析和计算结果表明，桩侧注浆可以明显提高超长桩的侧摩阻力；采用预压加载可以增强超长桩的弹性，减少桩顶的沉降；卸荷稳定后试桩具有桩侧阻力，桩身上段所受阻力为负摩阻力，下段为正摩阻力，同时具有的桩身轴力使试桩产生一定的压缩，其压缩量为残余变形量的重要组成部分

关键词: 超长钻孔灌注桩, 单桩承载性能, 竖向抗压静载试验方法, 桩侧摩阻力

Abstract: The layers of a main tower construction site in Tianjin are mainly clay, silt and silt sand. Two groups of the super-long bored test piles with post pressure-grouting (a total of eight piles) are designed to take bearing behavior test using single pile vertical static load test of compression to master the engineering properties in the main tower construction site. Vibrating wire reinforcement meter and stratified settlement tube are installed to find out the pile side friction and the pile body layered settlement state. After the test, the results of the data analysis show that the pile side grouting can significantly improve the long pile side skin friction; pre-load pressure can enhance the flexibility of the super-long pile and reduce the settlement of the top of the pile in some degree. After unloaded stability, the test pile also has side resistance; the resistance of the upper segment is negative skin friction; and the lower segment is positive skin friction; and the pile body axial force causes the test pile to have some compression volume; that is an important part of the residual deformation.

Key words: super-long bored piles, bearing capacity of single pile, vertical static load test method of compression, pile shaft friction

中图分类号:

TU 473.1+1

柯洪，吴翔，王继华，曾云川，赵春宏，冯庆高. 天津厚地层超长钻孔灌注桩单桩承载特性研究[J]. , 2011, 32(9): 2821-2826.

KE Hong1，WU Xiang ，WANG Ji-hua ，ZENG Yun-chuan ，ZHAO Chun-hong ，FENG Qing-gao. Research on vertical bearing capacity of single super-long bored pile in thick stratum of Tianjin[J]. , 2011, 32(9): 2821-2826.

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