Method for estimating plastic strain of graded broken stone mixture under action of repeated load

Abstract

The method for estimating the plastic strain of the graded broken stone mixture under the action of the repeated load comprises: the step 1, carrying out a repeated load test on single-particle-size broken stones with different particle sizes to obtain the plastic strain of the single particle size; the step 2, carrying out repeated load tests on the single-particle-size gravels under different working conditions, analyzing the influence of different factors on the plastic strain of the single-particle-size gravels, and determining main influence factors and correction influence factors of a plastic strain model of the single-particle-size gravels; establishing a single-particle-size gravel plastic strain model under the action of repeated loads; the step 3, establishing a plastic strain estimation model of the graded broken stone mixture on the basis of the plastic strain model of the single-particle-size broken stone according to the influence of the particle size composition of thecoarse aggregate particles, the skeleton structure and gaps thereof and the grading composition of the fine aggregate on the plastic deformation of the graded broken stone; and calculating the plasticstrain of the graded broken stone mixture under different working conditions. According to the method, the plastic strain of the graded broken stone mixture composed of broken stones with different particle sizes under different working conditions under the action of repeated loads can be determined.

Description

technical field [0001] The invention belongs to the field of road engineering, and relates to a plastic strain estimation method of a graded crushed stone mixture under repeated loads. Background technique [0002] Graded crushed stone is a flexible pavement structural base or subbase material commonly used in road engineering at home and abroad. It can effectively avoid reflective cracks on the pavement, reduce water damage, improve durability, and achieve complete regeneration. It is widely used. However, in the actual application process, the graded crushed stone will produce excessive plastic deformation under repeated loads, which will cause problems such as rutting, wave deformation, and uneven surface on the flexible base asphalt pavement, which will seriously affect the service level of the pavement. Therefore, it is very important to accurately grasp the plastic deformation behavior of graded crushed stone and scientifically predict the plastic deformation of the gr...

AI Technical Summary

Problems solved by technology

However, in the actual application process, the graded crushed stone will produce excessive plastic deformation under repeated loads, which will cause problems such as rutting, wave deformation, and uneven surface on the flexible base asphalt pavement, which will seriously affect the service level of the pavement.

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