钢管桩和预应力管桩的极限抗拔破坏试验研究

Experimental Study on Ultimate Uplift Failure of Steel Pipe Piles and Prestressed Pipe Piles

开展了钢管桩和预应力管桩的单桩竖向抗拔破坏试验,尝试得到抗拔极限承载力与承载力特征值的比值规律,从而更好的指导设计及施工。试验表明,钢管桩拔极限承载力介于其特征值的2.1倍~3.8倍,预应力管桩抗拔极限承载力介于其特征值的1.8倍~2.6倍,2倍的设计取值是合理的,且相对钢管桩来说偏保守。

The single pile vertical pull-out failure tests of steel pipe pile and prestressed pipe pile are carried out to try to obtain the ratio law between the ultimate pull-out bearing capacity and the characteristic value of bearing capacity,so as to better guide the design and construction.The test shows that the ultimate uplift bearing capacity of steel pipe pile is between 2.1 times and 3.8 times of its characteristic value,and the ultimate uplift bearing capacity of prestressed pipe pile is between 1.8 times and 2.6 times of its characteristic value.The design value of twice is reasonable and conservative compared with steel pipe pile.