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一、前言 桩基负摩阻力计算又称桩基负表面摩擦力计算。 在桩基中,一般桩受荷载作用后,桩周表面通常作用向上的摩擦力R_f(参看图1,a)。然而,桩侧软弱土层有超载作用(例如,土层压密未完进行填土和新的冲填土;打桩后进行填土或筑堤;土层中地下水位下降等。)此时桩身周围土固结,桩侧土体对桩身出现相对的向下位移,於是在桩周表面产生了向下作用的摩擦力(图1,b),即负摩擦阻力。
I. Introduction Pile negative friction resistance calculation, also called pile negative surface friction calculation. In the pile foundation, after the general pile is subjected to the load, the peripheral surface of the pile usually exerts an upward friction force R_f (see FIG. 1, a). However, there is an overloading effect on the weak sides of the pile (for example, soil compaction has not yet been completed and new fill has been filled; filling or embankment has been carried out after piling; and groundwater levels have dropped in the soil. The consolidation of the surrounding soil results in a relative downward displacement of the pile body on the side of the pile, resulting in a downward frictional force on the surface of the pile (Figure 1, b), that is, negative frictional resistance.