灰土挤密桩复合地基桩土应力比试验研究

结合灰土挤密桩处理湿陷性黄土地基工程实际进行了单桩、三桩复合地基静载荷现场试验。试验结果表明：桩顶应力、桩间土应力随板底应力的增大而增大，并且应力逐渐向桩顶集中；距离桩边不同位置处的桩间土应力沿桩径方向呈非线性分布；相同的板底应力条件下，单桩复合地基桩土应力比大于三桩复合地基桩土应力比，该结论可为类似复合地基设计提供参考。

Field Testing Study on Pile-soil Stress Ratio of Lime-soil Compacted Pile Compound Ground

The field loading test of single pile and three piles composite ground are studied combining the construction of lime-soil compacted pile in collapsible loess foundation. The stress of pile top and soil between piles increases with the stress of plate bottom, and the stress gradually concentrates to the pile top. The stress distribution of soil between piles along the radial shows non-linearity. When the stress of plate bottom is uniform, the pile-siol stress ratio of single pile composite ground is bigger than the value of three piles composite ground. The conclusion may provide reference for similar composite ground design.