低强度混凝土桩处理桥头软基的试验研究

Test and Research on Reinforcing Soft Foundation of Bridge-Ends by Low Intensity Concrete Piles

在软土地基修建高等级公路中 ,“桥头跳车问题”是一个技术难题。低强度混凝土桩是一种新型的处理桥头深厚软基的工法。某大桥桥头段深厚软基采用该工法处理 ,对桩顶及桩间土沉降、土工格栅上沉降、深层土体水平位移、孔隙水压力变化、土压力变化等进行了现场监测 ,进行了静载荷试验 ,对测试结果进行了分析。结果表明 ,该工法方法能大幅度减小沉降 ,减小对桥台基础的水平推力 。

In the highway construction on soft foundation, 'bump at bridge-ends' is a difficult technical problem. The low intensity concrete piles is a new method which can improve the soft foundation of bridge approaches. The soft foundation of a certain bridge approaches is improved by this method and soil settlements on and between piles, geogrid settlement, sub-surface soil movement, pore water pressure, and earth pressure are monitored and static load tests conducted. The results indicate that this method can minish settlement largely and decrease level thrusts on bridge abutments, its economic benefits are notable.