新疆某电厂灌注桩荷载传递性状试验研究  

Study on Load Transfer Mechanism of Bored Piles for One Power Plant in Xinjiang Province

作　　者：梁冠军[1] 赵羽[1] 

机构地区：[1]国核电力规划设计研究院,北京100095

出　　处：《价值工程》2015年第14期125-128,共4页Value Engineering

摘　　要：灌注桩因施工工艺复杂,易出现质量问题,且桩基的承载性能受到土体强度和桩身强度、施工工艺等诸多因素的影响,要正确认识桩基的承载性能,需要了解桩的荷载传递特性。本文以新疆某电厂灌注桩桩基静载试验为例,分析了灌注桩荷载传递性状:试桩上部土层的侧摩阻力逐渐发挥至极限后,随着桩顶位移的继续增加出现了软化现象,具有明显的峰值;试桩最大端阻比8.6%,桩端阻远未达到规范的参考限值,即使桩端持力层可视为不可压缩的中密卵石层,实际仍属端承摩擦桩。Because of the complexity of the construction process of cast-in-place pile,which is easy to have quality problems and the bearing behavior of pile is affected by the soil strength,the strength of the pile itself,construction technology and other factors.In order to achieve the bearing performance of bored piles,it＇s necessary to study the load transfer mechanism of bored piles.Taking a power plant of XIN jiang province as an example,based on the in-situ test data of bored piles,the mechanism of axial load transfer was analyzed.The result shows that after the lateral friction of upper soil along the test pile gradually increased to their limits,along with the increase of the displacement of pile,the lateral friction of upper soil change to be degraded,which have a significant peak.The maximum ratios of resistance of pile toe to ultimate loads is 8.6%,which means resistance of pile toe is far from the standardized reference limit,even if the medium dense gravel under the pile toe can be regarded as incompressible,the pile is still end bearing friction pile.

关 键 词：灌注桩 静载荷试验 荷载传递 桩侧摩阻力 桩端阻力 

分 类 号：TU473.1[建筑科学—结构工程]