刚体和土体的相互作用原理

Principle of interaction between rigid body and soil

在荷载作用下，刚体与其周围土体之间会产生相对于刚体表面的法向位移和切向位移。由于刚体不可变形，这些相对位移只能通过土体的法向和切向变位来实现。但这两种相对位移不是孤立的，它们通过刚体绕某一特定点（ｘ０，ｙ０）转动一个微小角度φ０被统一起来。文中从刚性抗滑桩空间受力状态的静力平衡条件出发，推导了若干组静力平衡方程式。将这些方程组简化后，用于刚性明挖基础的计算，结果基底竖向应力和目前通行的计算方法完全相同。

The following idea about the interaction between rigid body and soil are put forward in this paper.Under loads,a rigid body and the surrounding soil will change relatively their positions normal to or tangent to the faces of the rigid body.Since the rigid body can not be deformed,these positions changes can only be done by the deformations of normal compression or tangential bending of the surrounding soil .These two relative changes of position are not separated mutually,and can be interconnected by that the rigid body turns a little angle φ 0 round a special point (x 0,y 0). The paper deduces several groups of static equations depending upon the space static balance conditions of the rigid piles against sliding.Simplifing the equations and using them to the calculations of rigid foundations,the results of vertical pressure stresses are same completely with the traditional theory.