A Method for Determination of Duncan-Tension Model Parameters for Sandy Soils from Direct Shear and Uniaxial Compression Tests

Abstract

The invention discloses a method for determining sandy soil Duncan-Chang model parameter through straight shearing and single-shaft compression tests. The method comprises the following steps of (1) obtaining the sandy soil inner friction angle phi tr through direct shearing tests; (2) obtaining a plurality of values of sandy soil lateral confinement compression modulus Es through single-shaft compression tests; (3) calculating a plurality of values of the volume modulus B; obtaining the value of a parameter kb and the valve of a parameter m; (4) obtaining a value of a parameter k according to the expression of the volume modulus B or the value of any one volume modulus B so as to finally obtain the values of the parameter k, the parameter n, the parameter m, the parameter phi tr and the parameter kb of a sandy soil Duncan-Chang model. Through the improvement on the types of the critical intermediate parameters, the parameter test obtaining modes and the like, compared with the prior art, the method can effectively solve the problem of obtaining difficulty of the sandy soil Duncan-Chang model parameter through tests.

Description

technical field [0001] The invention belongs to the field of constitutive models of soil, and more specifically, relates to a method for determining sandy soil Duncan-Zhang model parameters by direct shear and uniaxial compression tests. A method for obtaining key constitutive parameters of the Duncan-Zhang model for sandy soil materials. Background technique [0002] The Duncan-Zhang constitutive model fully considers the characteristics of soil stiffness changing with the stress level, reflects the compaction of soil, and can better simulate the characteristics of soil. The model parameters are few and the physical meaning is clear, so it is widely used in engineering practice. It has become one of the most commonly used soil constitutive models in various analysis. [0003] In the Duncan-Zhang model, the hyperbola is used to fit the stress-strain relationship of the soil under the triaxial compression test, and the tangent modulus E of the soil under the triaxial compres...

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Problems solved by technology

[0015] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for determining sandy soil Duncan-Zhang model parameters by direct shear and uniaxial compression tests, wherein by the type of key intermediate parameters and their tests Compared with the existing technology, it can effectively solve the problem of difficult acquisition of sandy soil Duncan-Zhang model parameters, and this method combines elastic theory with nonlinear elastic Duncan-Zhang model, and can adopt two A simple test method can quickly determine the constitutive parameters of Duncan-Zhang model for sandy soil materials

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