基于标准贯入度试验的桩基轴向承载力估算

Estimation on axial bearing capacity of pile foundation based on standard penetration test

桩基轴向承载力的确定是高桩码头设计的核心内容之一。海外项目前期设计时,地勘资料常常过于简单,缺少设计所需的必要参数,因此标准贯入度试验(SPT)成果显得至关重要。结合英标BS8004规范中的有关通过SPT计算桩基轴向承载力的条款,分析国内外学者的相关研究成果,将BS规范系数与之对比。探讨单位面积桩侧和桩端摩阻力经验系数的取值,给出桩基轴向承载力计算时经验系数的合理建议值。最后结合现场试验数据,验证该参数的合理性,可为类似海外工程提供一定的参考。

The determination of the axial bearing capacity of the pile foundation is one of the essential contents of the design for high-piled wharves.However,in the preliminary design of overseas projects,the geological survey data is usually too simple and lacks the necessary parameters required for the design.Therefore,the data of standard penetration test(SPT)is very important.In this paper,combining the provisions of the British standard BS8004 on calculating the axial bearing capacity of pile foundations based on SPT,and by analyzing relevant research results of several scholars,we compare coefficients of unit skin friction resistance and unit end bearing resistance between the BS standard and relative research.The value of the empirical coefficient of pile side and pile tip friction resistance per unit area is discussed,and a reasonable recommended value of the empirical coefficient in the calculation of the axial bearing capacity of the pile foundation is given.Finally,combined with static pile loading test data and pile dynamic load test,the rationality of the empirical is verified,which can provide a reference for similar overseas projects.