路基端承CFG桩完整性及单桩(复合地基)承载力研究

Research on Integrity of Cement-flyash-gravel Pile and Bearing Capacity of Its Single Pile(Composite Foundation) of Subgrade

武广客运专线路基CFG桩部分地段由于施工工艺及孔底有水原因,导致桩端一定厚度的混凝土产生离析,采用桩端反射波曲线特征分析法确定桩端离析混凝土厚度及性质,从而判定桩身混凝土施工质量;采用单桩和单桩复合地基静载试验,确定单桩承载力和单桩复合地基承载力。

Certain thickness of concrete in the bottom of cement-flyash-gravel pile of subgrade of Wuhan-Guangzhou passenger dedicated line is disintegrate because of the construction technology and water at the bottom of hole. The thickness of disintegrated concrete is detected by the reflected wave method and its properties are analyzed,in which the construction quality of concrete of pile is decided. By static load test,the bearing capacity of single pile and the bearing capacity of single pile composite foundation...