路堤荷载下水泥搅拌桩复合地基桩土应力比的现场试验

FIELD TESTS ON PILE-SOIL STRESS RATIO OF CEMENT-SOIL MIXED PILE COMPOSITE GROUND UNDER EMBANKMENT

通过对填砂路堤下水泥搅拌桩复合地基桩土应力比的现场试验,获得路堤荷载下水泥搅拌桩复合地基桩、土应力,并对复合地基中桩土应力比随荷载和时间的变化规律进行探讨。试验结果表明,路堤荷载下水泥搅拌桩复合地基桩土应力比的变化规律与刚性基础下复合地基桩土应力比的规律有较大差别,它随荷载的增加呈先减小后增大的规律,桩土应力比不超过2.0,且随时间基本不变。

Field tests on pile-soil stress ratio of composite ground with cement-soil mixed pile under embankment filled with sand are carried out, the stresses on pile and surrounding soil are measured. Variations of pile-soil stress ratio of the composite ground with cement-soil mixed pile under embankment with flexible load and time are investigated. The measured results show that the variation of pile-soil stress ratio under embankment is quite different from that under rigid foundation, the measured pile-soil stress ratio is much more less than that under rigid foundation, it varies with embankment load from decrease to increase,its values are less than 2.0,and changes hardly with time.