利用静力触探数据估算钻孔灌注桩承载力的探索  

Estimating the Bearing Capacity of Bored Pile Based on the Data of Static Cone Penetration

作　　者：刘丹[1,2] 周玉凤 Liu Dan;Zhou Yufeng(Beijing Urban Construction Exploration and Surveying Design Research Institute Co.,Ltd.,Beijing 100101,China;Beijing Key Laboratory of Geotechnical Engineering for Deep Foundation Pit of Urban Rail Transit,Beijing 100101,China)

机构地区：[1]北京城建勘测设计研究院有限责任公司,北京100101 [2]城市轨道交通深基坑岩土工程北京市重点实验室,北京100101

出　　处：《岩土工程技术》2023年第4期433-437,共5页Geotechnical Engineering Technique

摘　　要：《建筑桩基技术规范》(JGJ 94—2008)、《公路桥涵地基与基础设计规范》(JTG 3363—2019)等现行规范均给出了利用静力触探数据计算预制桩单桩竖向极限承载力标准值的公式,尚缺少利用静力触探数据计算钻孔灌注桩单桩竖向极限承载力标准值的公式。针对北京地区实际情况,根据现行规范混凝土预制桩和泥浆护壁钻(冲)孔桩的土层阻力经验值间的相对关系,初步建立了由静力触探法估算钻孔灌注桩的竖向极限承载力标准值的经验公式,工程实例表明,利用静力触探估算钻孔灌注桩承载力的数值在深部砂层较经验参数查表法有较大提高。According to the current specifications such as"Technical Specification for Building Pile Foundations"(JGJ 94—2008)and"Specifications of Foundation of Highway Bridges and Culverts"(JTG 3363—2019),the standard values of vertical ultimate bearing capacity of single pile calculated by static cone penetration test are all for precast pile,and there is still no formula for bored cast-in-place pile.In this study,based on the actual situation in Beijing and the relationship between the empirical values of the concrete precast pile and the bored pile with slurry wall protection in the current code,an empirical formula is established to estimate the standard value of the vertical ultimate bearing capacity of the bored pile by the static penetration method.Combined with engineering examples,it shows that the value of estimating the bearing capacity of bored pile by static cone penetration test is much higher than the traditional look-up table method in deep sand layer.

关 键 词：静力触探 钻孔灌注桩 极限承载力 桩基规范 

分 类 号：TU470[建筑科学—结构工程]