【摘要】 我国东南沿海地区山海相接的地段广泛分布着上部为高含水量深厚软土、下部为全～强风化岩浆岩的二元结构地层，为探讨该地层桩基侧壁摩阻力取值和m值计算问题，依托福州可门港铁路大桥桩基工程，采用慢速维持荷载法对单桩进行竖向和水平静载原位试验。研究结果表明：钻孔灌注桩的竖向荷载主要由风化岩层的桩侧摩阻力承担，上覆淤泥土层的桩侧摩阻力标准值分布在建筑桩基规范推荐值的下限附近，在设计中其侧阻力标准值可按规范推荐值的下限取值；在桩顶水平加载条件下，钻孔灌注桩不同深度的地基水平抗力系数的比例系数m值与水平位移呈良好的指数关系，桩顶位移为10mm时，m值宜取3.6MN/m~4。研究结果可为类似滨海软土-风化岩浆岩二元结构地层的桩基础设计提供参考与借鉴。更多还原

【Abstract】 In the southeast coastal area of China, there is a widespread distribution of a dual-layered geological formation where the upper part comprises deep soft soil with high water content, while the lower part consists of highly weathered rock. To explore the frictional resistance value and m value calculation of pile foundation in this typical stratum, based on the pile foundation project of Kemen Port Railway Bridge in Fuzhou, the vertical and horizontal static load in-situ tests of a single pile are carried out by the slow load method. The results show that the vertical load of the poured pile is mainly borne by the pile-side frictional resistance of the weathered rock layer. The standard value of the pile-side frictional resistance of the overlying silt soil layer is distributed near the lower limit of the recommended value of the building pile foundation code. In the design, the standard value of the side resistance can be taken according to the lower limit of the recommended value of the specification. Under horizontal loading on the pile top, the proportional coefficient m value of the horizontal resistance coefficient of the foundation at different depths of poured piles has a good exponential relationship with the horizontal displacement. When the displacement of the pile top is 10mm, the m value should be 3.6 MN/m~4. The research conclusions can provide references for the design of pile foundations similar to the binary structure stratum of coastal soft soil and weathered magmatic rock.更多还原