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桩按其将桩顶荷载传递给土的方式,即按荷载传递机理可分为四种类型:摩擦桩(桩顶垂直荷载几乎只由桩侧摩阻力 Qs 承受,即极限荷载 P_u≈Q_(Su),而桩端极限阻力Q_(Pu)≈0);端承摩擦桩(桩顶垂直荷载主要由桩侧摩阻力承受,即在极限荷载下,Q_(Su)>Q_(Pu));摩擦端承桩(桩顶垂直荷载主要由桩端阻力承受,即在极限荷载下,Q_(Pu)>
The pile is divided into four types according to the method of transferring the pile top load to the soil, that is, according to the load transfer mechanism: friction pile (vertical load at pile top is almost only subjected to the pile side frictional resistance Qs, that is, the ultimate load P_u≈Q_(Su ), And the end of the limit resistance Q_ (Pu) ≈ 0); end bearing friction pile (vertical load pile top is mainly by the pile side friction resistance, that is, under the ultimate load, Q_ (Su)> Q_ (Pu)); friction End-bearing piles (vertical load at pile top is mainly subjected to end-resistance of the pile, that is, under the limit load, Q_(Pu)>