Prestressed high-strength concrete (PHC) pipe pile with static press-in method is widely used in recent years. The earth pressure at the pile-soil interface caused by the process of pile jacking has an important influence on the jacked pile construction and even the bearing characteristics. Based on a construction project in Dongying, the change law of earth pressure at pile-soil interface caused by the penetration of PHC pipe pile is analyzed by monitoring the earth pressure at pile-soil interface during pile jacking, and the evolution characteristics of earth pressure at pile-soil interface in viscous soil foundation are revealed. The results show that the earth pressure at the pile-soil interface at different positions (h/B) caused by the penetration of PHC pipe pile gradually increases with time. In the process of pile jacking, the influence of pile jacking on the earth pressure at the pile-soil interface on the pile body and part that exceeds the relative distance of effective pile end (h/B) is weak. In the process of pile jacking, the earth pressure at the pile-soil interface is greatly affected by the relative height of the pile end (h/B), so it is necessary to consider the effect of the pile length to calculate the earth pressure at the pile-soil interface. The phenomenon of "lateral pressure degradation" exists with the increase of h/B in the earth pressure at the pile-soil interface. The research results have certain engineering guiding significance for construction and bearing capacity determination of jacked pile in viscous soil foundation.

近年来，采用静压法的预应力高强混凝土管桩被广泛使用。顶桩过程引起的桩土界面土压力对顶桩施工乃至承载特性都有重要影响。以东营市的一个建设项目为例，通过监测顶桩过程中桩-土界面处的土压力，分析了PHC管桩渗透引起的桩-土界面土压力的变化规律，并分析了土压力的演变特征。揭示了粘性土基础中桩-土界面的情况。结果表明，PHC管桩穿入引起的桩土界面不同位置（h / B）处的土压力随时间逐渐增大。在顶桩过程中，顶桩对桩体和桩体上超过有效桩端相对距离（h / B）的部分处土-土界面处土压力的影响很小。在顶桩过程中，桩-土界面处的土压力受桩端相对高度（h / B）的影响很大，因此有必要考虑桩长的影响来计算土压力。在桩-土界面处。随着桩-土界面处土压力的h / B增加，存在“侧向压力下降”现象。研究结果对黏性地基中顶桩的施工及承载力的确定具有一定的工程指导意义。