深厚软土地基钢管桩静载试验研究

通过对软土地基中1根桩长52.5 m、桩径1 m的钢管桩的压桩试验、拔桩试验和水平静载试验,探讨软土地基中钢管桩工程性状和分布规律。结果表明:软土地基钢管桩水平静载试验的最大弯矩值在泥面以下2倍桩径处,且不随着荷载的增加而改变;软土地基的水平静载试验,按照按泥面位移10 mm进行位移控制时,其m值可取3 500 kN/m~4;软土地基由于侧阻力较小,压桩试验时,传递至桩底的轴力值与桩顶荷载的比例可达30%,而拔桩时,该值为12%左右。

Static load experimental study on steel tube piles in deep soft soil foundation

A 52.5 m-length and 1.0 m-diameter steel tube pile is driven into soft soil foundation.According to the pile pressing experiment,pile pulling experiment and pile horizontal static load experiment,we discuss the engineering properties and distribution law of steel tube pile in soft soil foundation.The results show that the maximum bending moment of the horizontal static load experiment of the steel tube pile in the soft soil foundation is at 2 times the pile diameter below the mud surface,and does not change with the increase of the load.According to the horizontal static load experiment result,the m value should be 3 500 kN/m4 considering the displacement of mud level to be 10 mm.The side resistance of soft soil foundation is small,so the ratio of the axial force to the pile top is 30% in the pressing pile experiment,and it is about 12% in the pulling pile experiment.