DX桩承载特性的模型试验研究

Model test study on load-bearing mechanism of DX pile

DX桩是近年兴起的新型变截面桩型,其独有的承力盘很好地改善了沉降问题。通过室内小比尺模型试验,得出DX桩承载力及沉降特性的相关规律,为DX桩承载机理的研究提供进一步的试验支持。试验主要采用应变片测量桩身受力情况,桩顶设置百分表测量沉降情况,加载装置采用砝码以及杠杆分级加载。试验主要为与直孔桩对比试验以及DX桩平行试验。试验结果证明DX桩在承载力和沉降方面都优于直孔桩;上盘承载力大于下盘,随桩顶荷载增大,下盘承载所占比重有所提高。

DX pile is a new kind of variable cross-section pile invented recent years, its unique load-carry- ing bells will reduce the settlement. Through small scale model test to study the theory of the DX pile. This experi- ment uses strain gage for studying of axial force analysis, dial indicator for studying of settlement, lever instrument for grading loading It bases on the comparative tests with the straight pile and DX parallel experiment. The results show that the DX pile is superior to straight pile both on bearing than that of the below, but with the total load increasing, capacity and settlement; the upper bell bears more the below bell＇ s bearing capacity proportion increase.