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粗粒土的强度具有明显的非线性,本文在大型单剪仪的试验基础上分析了粗粒土非线性强度机理,认为强度非线性意味着强度参数的非线性,阐述了用切线参数描述强度非线性的原理,切线参数cσ、tanφσ都随法向应力σn变化。根据强度理论和数学原理提出了非线性强度的切线参数确定方法,针对某一法向应力的抗剪强度仍然可用线性库伦公式这一基本形式表达,而不用改变强度理论先前的运用原理。实例表明,切线参数的确定方法和非线性强度的计算不存在理论误差。虽然主要讨论粗粒土,但期望思路和方法可应用于具有强度非线性性质的其他土类。
The strength of coarse grained soil is obviously non-linear. Based on the test of large single shearer, the nonlinear strength mechanism of coarse grained soil is analyzed. It is considered that the nonlinearity of strength means the nonlinearity of strength parameter, and the intensity Nonlinear principle, tangential parameters cσ, tanφσ all change with the normal stress σn. According to the theory of strength and the principle of mathematics, the method of determining the tangent parameter of nonlinear strength is proposed. The shear strength against a normal stress can still be expressed in the basic form of linear Coulomb’s formula without changing the previous theory of strength theory. The examples show that there is no theoretical error in the method of determining tangent parameters and the calculation of nonlinear strength. Although the main discussion of coarse grained soil, but the ideas and methods can be applied to the strength of other non-linear nature of soil.