桩侧阻力与抗剪强度的关系及其随深度的变化

Relationship Between Pile Lateral Friction and Shear Strength and Its Variation with Depth

该文在库伦定律的基础上,建立起土体的抗剪强度指标与桩侧阻力的数学模型,并运用该数学模型对土的抗剪强度和桩侧阻力的关系以及桩侧阻力随深度的变化特点进行了分析,分析认为:除特定条件,桩的极限侧阻力与桩周土的抗剪强度不一定相等,桩土接触面不一定是剪切破裂面;不同类型的土中,桩的极限侧阻力随深度的变化规律不同,部分类型的土因内摩擦角和侧压力系数之间的特定关系而使桩的侧阻力表现出了"深度效应"。

On the basis of the coulomb＇s law,the mathematical model about shear strength indexes of soil and lateral friction of pile is established,and through this model,the relationship between shear strength of soil and lateral friction of pile and the changing characteristic of pile lateral friction with depth are analyzed. The analysis shows： Except for the specific conditions,the ultimate lateral friction of the pile is not necessarily equal to the shear strength of the soil around the pile,and the contact surface between the pile and soil is not necessarily the shear fracture surface; In different types of soil,the changing rule of ultimate lateral friction of pile with depth is different,and because of specific relationship between the angle of internal friction and lateral pressure coefficient,the lateral friction of pile shows the phenomenon of＂deep effect＂.