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通过对湿陷性黄土大直径旋挖嵌岩灌注桩静载荷试验和桩身应力测试,对其桩身内力、荷载传递、侧阻力、端阻力及桩端阻力与桩侧阻力的相互关系等内容进行了试验研究。分析表明:1)良好的嵌岩桩桩岩胶结状况对嵌岩段和上覆土层桩侧阻力的发挥有较大影响;2)桩端承载性状对桩侧阻力强化效应发生的前提条件是桩端阻力承担一定的荷载,强化效应一般可使桩侧阻力提高20%～50%;3)桩端阻力对桩侧阻力的强化效应不仅表现在桩端附近,在桩身上部土层中也有强化效应现象。上述关系可以提高嵌岩桩桩侧阻力及单桩承载力,进一步进行桩基进行优化设计。
Through the static load test and the pile stress test of the large diameter rotary pored rock-socketed cast-in-situ piles with collapsible loess, the relations among the internal forces, load transfer, lateral resistance, end resistance, pile-end resistance and pile-side resistance Conducted a pilot study. The analysis shows that: 1) Good rock-socketed pile-rock cementation condition has a great influence on the lateral resistance of socketed section and overburden layer; 2) The prerequisite for pile-side resistance enhancement effect is pile End resistance to bear a certain load, strengthening the effect of the general side of the pile can increase the resistance of 20% to 50%; 3) pile end resistance on the pile side of the reinforcement effect not only in the pile near the end of the pile in the upper soil is also enhanced Effect phenomenon. The above relationship can improve the lateral resistance of rock-socketed pile and the bearing capacity of single pile, and further optimize the design of pile foundation.