刚性桩复合地基的载荷试验问题  

The loading test of rigid piles for composite foundation

作　　者：杨光华[1,2] YANG Guanghua(Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510610,Guangdong,China;The Geotechnical Engineering Technology Center of Guangdong Province,Guangzhou 510610,Guangdong,China)

机构地区：[1]广东省水利水电科学研究院,广东广州510610 [2]广东省岩土工程技术研究中心,广东广州510610

出　　处：《地基处理》2024年第4期421-424,共4页Journal of Ground Improvement

基　　金：国家自然科学基金(52078143)。

摘　　要：《建筑与市政地基基础通用规范》(GB 55003—2021)对刚性桩复合地基承载力验收的条文是:复合地基承载力的验收检验应采用复合地基静载荷试验,对有粘结强度的复合地基增强体尚应进行单桩静载荷试验。在实际工程中,可能会遇到这样的情况:(1)复合地基静载荷试验合格,单桩静载荷试验不合格,复合地基承载力真的不合格吗?(2)复合地基和单桩静载荷试验都合格,复合地基承载力就一定合格吗?本文对此进行了分析讨论,认为与地质条件有关,规范方法主要是针对单一均匀地基的情况,对于多层土地基,规范方法有局限性,由于试验压板尺寸小,压板试验还不能反映深层土的影响。对于大尺寸的基础,还要进行科学的分析,应对实际尺寸的基础沉降进行计算分析,才能判断和保证工程的安全,仅靠小尺寸的压板载荷试验是不够完善的。General Code for Foundation Engineering of Building and Municipal Projects(GB 55003—2021) mandates that the acceptance of the bearing capacity for rigid piles for composite foundation must include the composite foundation loading test and a single pile static loading test as well for those reinforced with bonding strength.In practice,one may encounter scenarios such as:(1) If the composite foundation is qualified to the static loading test but the single pile test fails,does this necessarily indicate that the composite foundation's bearing capacity is inadequate?(2) If both the composite foundation and single pile tests are qualified,does this ensure that the bearing capacity of composite foundation is adequate? This work analyzes and discusses these issues,supposing that they are related to geological conditions.The standard method primarily addresses uniform soil foundations,but it has limitations for multilayer soil foundations due to the small size of the test plate,which cannot fully represent the impact of deeper soil layers.For large foundations,scientific analysis is required,and it is essential to calculate and analyze the settlement for the actual size of the foundation to ensure and assess the project safety.Relying solely on small-scale plate loading tests is not a comprehensive method.

关 键 词：刚性桩复合地基 平板载荷试验 地基承载力 地基处理 复合地基检测试验 

分 类 号：TU47[建筑科学—结构工程]