(1 同济大学地下建筑与工程系，上海 200092；2 同济大学岩土及地下工程教育部重点实验室 上海 200092)

［提要］以上海某工程超长偏位PHC管桩竖向承载力分析为背景，采用有限元数值分析方法，同时考虑桩身结构强度和土的强度，对该工程超长PHC管桩由于水平偏位而对竖向承载力产生的影响进行了计算分析。计算结果表明，存在一个临界偏位值，当桩顶偏位值大于该值时，该区域为按桩身极限弯矩控制的计算区域；当桩顶偏位值小于该值时，该区域为按土体强度控制的计算区域。桩基载荷试验结果证明，所采用的分析方法和计算结果是有效的，根据该计算方法可方便地绘制PHC管桩的竖向极限承载力和桩顶水平偏位的关系曲线。

［关键词］超长PHC管桩；偏位；极限弯矩；竖向承载力

Study on Vertical Bearing Capacity of Sloping Superlong PHC Pile Subjected to Lateral Soil Movements/Zhou Jian1，2, Zhang Zha1, Wang Lei1(1 Department of Geotechnical Engineering, 2 Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China)

Abstract:Based on the study of vertical bearing capacity of sloping super-long PHC pile, considering the strength of pile body and soil at the same time, the FEM was adopted to calculate the vertical bearing capacity of sloping super-long PHC pile subjected to lateral soil movements. The calculation results indicate that there is a critical sloping displacement. When the sloping displacement of pile head is greater than the critical value, the calculation area is controlled by the strength of soil, and when the sloping displacement of pile head is less than the critical value, the calculation area is controlled by the strength of pile body. The test results prove that the analytical method adopted is effective. Based on the analytical method, the relation curve of the vertical bearing capacity and sloping displacement of pile head can be drawn conveniently.

Keywords:super-long PHC pile; sloping displacement; critical moment; vertical bearing capacity

*国家自然科学基金资助项目(50578122)；河南省杰出青年基金资助项目。