第33卷第6期 2016年11月
土木工程与管理学报 Journal of Civil Engineering and Management
Vol. 33 No. 6 Nov.2016
劲性复合桩抗拨承载机理分析与改进对策
易兴中，刘鑫烨
（南通建工集团股份有限公司，江苏南通226006）
摘要：由水泥土桩与预应力抗拔管桩组合所形成的劲性复合桩用于大型多层商业综合体建筑的抗浮构件，在国内外尚属首次。本文通过既有劲性复合抗拔管桩的承载机理分析、校核与对比，指出设计劲性复合抗拨桩存在承载力不足、耐久性缺陷，以及主导规程依据缺失等问题；根据静载试验桩与实际劲性复合抗拔桩受力工况条件对比分析，得出实际劲性复合桩的抗拔承载力特征值小于静载试验结果的结论；并依据分析结果，对桩基结构进行处置改进，使柱下独立承台群桩基础呈群桩整体破坏，而劲性复合桩中的刚性管桩与灌芯组合结构，以及刚性桩与承台节点不发生破坏，此时，可满足设计抗浮承载能力的要求。
关键词：劲性复合桩；水泥土桩；预应力管桩；抗拔承载力；静荷载拉拔试验；桩体结构改进
中图分类号：TU473.1
文献标识码：A
文章编号：2095-0985（2016)06-0026-07
UpliftBearingMechanism Analysis and Improvement Countermeasures
ofStrengthCompositePile YI Xin-zhong，LIU Xin-ye
(Nantong Construction Group Co Ltd, Nantong 226006, China)
Abstract: Strength composite pile composed of concrete soil pile and pre-stressed pull-out bearing pile is used as anti-floating components of large-scale commercial complex building, which is the first time in our country. The paper points out strength composite pile' s shortcomings of insufficient bearing capacity and duration through bearing mechanism analysis, check and comparison of strength composite pile, as well as problem of missing leading regulation basis; gets the conclusion that strength composite pile's characteristic value of uplift bearing capacity is less than static load test result according to comparative analysis of stress condition of static test pile and practical strength composite pile. According to analysis it make some improvements of strength composite pile in order that independent bearing pile caps under pile have overall damage, while rigid pipe pile, filling and core composite structures, rigid pile and bearing joint will not be damaged, at this point, regardless of calculation characteristic value of single-pile bearing strength of cement soil pile composite effect, it will satisfy requirements of anti-floating bearing capacity.
Key words: strength composite pile; cement soil pile; prestress pipe pile; uplift bearing capacity;
static pull-out load test; pile structure improvement
大型多层商业综合体建筑，常设有大型地下室，用于建筑物设备用房、地下停车场等功能性用房；在富含地下水地区，由于该类建筑物自重荷载小，抗浮稳定性设计控制是建筑物基础设计的关键内容之一，一般采用压重或设置抗浮构件，而设置抗浮构件措施是较经济的技术手段。常见的抗
收稿日期：2016-03-08修回日期：2016-04-29
浮构件分为永久性抗浮锚杆和抗拔桩，抗拔桩分为钢筋混凝土钻孔灌桩、先张法预应力抗拔管桩或空心方桩、预制钢筋混凝土方桩等形式。
先张法预应力抗拔管桩用于抗拔桩具有经济、快捷的优点，但因其节点承载能力控制难度大、施工因素影响环节多，以及管桩本身的配筋与
作者简布：数据1967-），江苏南通人，教授级高级工程师，硕士，研究方向为施工技术（Email:931046556@qq.com）