软土地基人工挖孔桩承载力试验研究

Experimental research on bearing capacity of belled pile in weak soil

在人工挖孔桩试验中预埋测试元件，研究桩的荷载传递机理。通过统计、分析福州地区３００根人工挖孔桩静载试验资料，提出本地区人工挖孔桩承载力计算方法和桩端常用土层的极限端阻力标准值。通过模型桩试验，对比了有无扩大头及扩大头不同直径对人工挖孔桩承载力的影响。

Field tests of belled pile(hand dug) instrumented with strainometers and pressure transducers have been conducted in Fuzhou in order to study shaft load transfer mechanism. Based on the results and the analysis of 300 static axial load tests, the formulas for calculating bearing capacity of belled pile and ultimate end bearing value of soil layers in Fuzhou Region are obtained.The influence of different size of enlarged base on the bearing capacity of pile is discussed with the help of model tests.