m法下的双曲线型p-y曲线

工程中基桩大多处于复杂的成层地基中,鲜有位于单一土层中,从宏观角度出发,引入初始地基比例系数,提出了基于m法的双曲线型p-y曲线。某现场7根试桩地基土非线性显著,实测和理论计算的地面处桩身水平位移水平荷载关系曲线均呈良好的二次抛物线关系,且理论与实测曲线吻合良好,验证了本文p-y曲线模型。地基土非线性对桩身最大弯矩、桩侧地基土压力影响显著,不容忽略。工程实际中采用m法计算基桩最大弯矩值偏小,建议乘以1.05~1.25的系数,以计入地基土非线性影响。

Analysis of pileby p-y curve method based on m-method

Most piles are set in layered soils.The initial foundation coefficient,a hyperbolic p-y curve containing a parameter,is derived to generally simulate the nonlinear soil around the pile.The soil around the tested pile is nonlinear,and both the tested and the calculated lateral displacement of the tested pile at the ground have a parabolic relation with the horizontal loads.The calculated lateral displacements of the tested pile at the ground fit the tested lateral displacements very well,and the hyperbolic p-y curve is proved good.The nonlinear soil will greatly increase both the maximum moment of the pile and the soil pressure.Thus it is suggested that the designed moment of the pile which is calculated by m-method,should magnified 1.05～1.25 times in order to consider the nonlinearity of the soil around the pile.