大直径挖孔扩底桩承载特性试验研究

Test Investigation on Characteristic of Bearing Capacity of Large Diameter Manually Excavated Belled Piles

通过对三根人工挖孔扩底桩进行静载试验,从埋于桩中不同层面的钢筋应力传感器和桩端压力传感器所获得的实测数据,分析研究了人工挖孔扩底桩的承载特性和荷载传递机理,探讨了桩端阻力、桩侧摩阻力发挥规律和桩沉降变形规律,得到了砾砂层的承载力最大值达到了3.65 MPa,而且还有富余,为今后此类桩在该地区的理论研究和设计应用提供了重要的参考作用.

Based on data from reinforcing steel bar stress transducer and pressure transducer embedded in the different layers of piles through field static loading test of three piles, the paper analyzes the characteristic of bearing capacity and load transfer mechanism of the manually excavated belled piles ,problems about the action laws of pile end resistance and lateral fricrtion resistance and shaft compression are also discussed. The load - bearing capacity of gravel sands reaches 3.65 MPa. And some important references for the theoretical research and technical application of manually excavated belled Piles in the region are provided.