用统一强度理论求解岩土材料的动力强度参数

基于俞茂宏的统一强度理论，研究了岩土材料在复杂应力状态下的强度理论及确定其动力强度参数的新方法。根据循环荷载作用的特点，把循环过程中的动态应变变化和极限平衡理论耦合起来，提出了基于统一强度理论考虑中间主应力的动态极限平衡概念，探讨了它在岩土材料中的应用，并推导出了确定有效动强度参数C′d，φ′d的方程。进一步研究了统一强度理论下的偏应力、有效固结压力和动态平衡状态线的概念，提出了确定有效动强度参数C′d，φ′d的简便方法。该方法不仅可以适用于砂土、粉土，而且还适用于沉积软岩材料。

DETERMINATION OF DYNAMIC STRENGTH PARAMETERS OF GEOMATERIALS BASED ON UNIFIED STRENGTH THEORY

Based on the Yu Maohong's unified strength theory,a new method is proposed to study dynamic strength parameters of geomaterials and strength theory under the complex stress state. Considering the property of repeated loads and the effect of intermediate principal stress,the concept of dynamic limit equilibrium under unified strength is put forward by coupling the dynamic strain with the theory of limit equilibrium,and then the equations that can determine the effective strength index dc and df are obtained. A simple method is also advanced to determine the effective strength index dc and df which takes account of the concept of deviator stress,effective consolidation pressure and the dynamic equilibrium line of unified strength theory. This method can be applied to sandy soils,silty soils and deposit soft rock.