堆载法与自平衡法结合在承载力检测中的应用
Application of Surcharge Method Combined with Self-balanced Method in the Pile Axial Compressive Loading Testing
孟新秋 1赵雪璞2
作者信息
- 1. 北京环安工程检测有限责任公司,北京 100026
- 2. 北京市城市道路养护管理中心,北京 100026
- 折叠
摘要
针对在基坑开挖前就要完成试桩试验的实际工程需求,承载力计算后拟定采用堆载法与自平衡法相结合,对桩身竖向抗压极限承载力进行检测,同时在桩身有效桩长范围内布设内力测试元件对加载过程桩身内力分布情况进行监测,进而推算桩周土侧摩阻力发挥程度;堆载法与自平衡法相结合能够很好的解决基坑开挖前就获取试桩试验参数这一问题,三根试桩在设计最大加载值作用下桩身均未发生破坏,单桩竖向抗压极限承载力为设计最大加载值;桩身内力测试结果表明,各土层在最大试验荷载下并未达到极限状态,桩身承载力并未完全发挥.
Abstract
To meet the requirement of axial pile loading test before the foundation pit excavation,it was decided that the loading test method should be the combination of the surcharging method and the self-balanced method after an estimation of the ulti-mate axial pile capacity.Meanwhile,the load transducers were placed within the effective range of the pile to monitor the distri-bution of loads along the pile shaft during the loading process,so that side resistance along the pile can be calculated.The com-bination of the surcharging method and the self-balanced method can easily solve the problem of completing the pile loading test before foundation pit excavation.All three test piles have no damage under the design maximum loading,and the axial ultimate capacity of the single pile is therefore the design ultimate loading value.The results of pile load distribution test show that the soil layer has not reached the limit state under the maximum test load.The ultimate axial pile resistance is not fully mobilized.
关键词
自平衡法/竖向抗压承载力检测/内力测试/侧摩阻力Key words
Self-Balanced Method/Axial Pile Compressive Loading Tests/Load Distribution/Side Resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据