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

作　　者：孟新秋 赵雪璞 MENG Xinqiu;ZHAO Xuepu(Beijing Huan'an Engineering Testing Co.Ltd.,Beijing 100026;Beijing Urban Road Maintenance and Management Center,Beijing 100026)

机构地区：[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

出　　处：《土工基础》2024年第2期328-331,341,共5页Soil Engineering and Foundation

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。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 ultimate axial pile capacity.Meanwhile,the load transducers were placed within the effective range of the pile to monitor the distribution of loads along the pile shaft during the loading process,so that side resistance along the pile can be calculated.The combination 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 

分 类 号：TU413[建筑科学—岩土工程]