Calculation method of three-dimensional strain failure criterion model of asphalt mixture

Abstract

The invention discloses a calculation method of a three-dimensional strain failure criterion model of an asphalt mixture. The calculation method comprises the following steps: carrying out strength and rigidity tests in a complex stress state, obtaining failure principal stress of the material, and establishing a stress failure criterion model in an octahedral space and a static resilience moduluscalculation model in the complex stress state; and on this basis, based on the generalized Hooke theorem, establishing an asphalt mixture three-dimensional strain failure criterion model consideringthe rigidity influence through a conversion method. According to the model, the influence of the complex stress state on the strength and rigidity of the asphalt mixture is considered, and synergisticdestructive effect among all strain components is also considered, so that compared with a traditional failure criterion model which does not consider rigidity changes, the nonlinear strength and deformation characteristics of the asphalt mixture can be reflected more accurately, and support is provided for reasonable selection of asphalt mixture material parameters and refined design of a road surface in the complex stress state.

Description

technical field [0001] The invention belongs to the field of road engineering, in particular to a calculation method for a three-dimensional strain failure criterion model of an asphalt mixture considering stiffness change. Background technique [0002] In expressway construction, more than 90% of domestic high-grade highways use asphalt pavement structure due to its good driving comfort and excellent performance, fast construction speed, and easy maintenance and repair. However, due to the increase of vehicle load and other reasons, many asphalt pavements were seriously damaged shortly after they were opened to traffic, which affected the service life of the pavement and the safety of driving. Economic losses. [0003] When analyzing the damage of asphalt pavement, the strength and deformation characteristics of asphalt mixture are one of the key research points. However, in the design of asphalt pavement, the compressive rebound modulus under uniaxial compression is ofte...

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Problems solved by technology

[0005] However, due to the lack of three-dimensional loading test equipment for asphalt mixtures, less research has been carried out on stiffness characteristics under complex stress states and strain failure criteria considering the influence of stiffness, resulting in the inability of the current calculation model of elastic modulus and one-dimensional failure criteria to be true. Reflect the strength, deformation and failure characteristics of the pavement

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