首次将岩土体荷载与位移特征曲线划分为3种类型,并定义高地应力的判别标准。提出一种新的本构理论,可以描述在不同正压力(或不同围压)下应力(或荷载)与应变(或位移)的全过程特征,只有3个描述材料结构和状态的力学参数。该理论不仅可以描述单个材料,也可以描述多种材料组成的复合材料和两种不同材料界面等力学特性,变形可达任意值。对于长沙湾特大桥基桩,在不同静载荷作用下不同土体与桩之间的力学特性采用新本构理论进行数值模拟,结果表明该本构理论可以描述不同岩土体和岩土体与基桩之间的力学特性。 For the first time, the load-displacement curves of rock and soil are classified into three types, and the criteria for determining the geostress of the ground are defined. A new constitutive theory is proposed to describe the whole process of stress (or load) and strain (or displacement) at different positive pressures (or different confining pressures). Only three mechanical parameters describing the structure and state of the material are presented. The theory can not only describe a single material, but also can describe the mechanical properties of the composites composed of a variety of materials and the interfaces of two different materials, and the deformation can reach any value. For the foundation of Changsha Bay Bridge, the mechanical behavior of different soil and piles under different static loads is numerically simulated by the new constitutive theory. The results show that this constitutive theory can describe the interaction between different soil and rock mass, Mechanical properties of pile foundation.