Graded broken stone compressive strength value test method

Abstract

The invention discloses a graded broken stone compressive strength value test method. According to the method, the simulation of the graded broken stone compressive strength value test is carried out through building a physical model. The method comprises the steps that basic parameters are tested, simulation generation of compressive strength test molds, virtual test specimens, compressive strength loading plates and the like is carried out, physical models are endowed with micro mechanical parameters, the compressive strength test loading process is simulated, the simulation results are sorted, a relationship curve of simulated press plate contact force and compression displacement is obtained, and the graded broken stone compressive strength is obtained through obtaining the peak value of the curve and carrying out the calculation. The method can be used for fast and accurately predicting the graded broken stone compressive strength value and reproducing the mechanical variation rule of graded broken stones during the compression load bearing.

Description

technical field [0001] The invention belongs to the field of traffic civil engineering, and relates to a numerical test method for compressive strength of graded crushed stone. The present invention is based on PFC 2D The software platform can conveniently reproduce the whole process of the change of mechanical properties of graded crushed stone under compressive load, and predict the law of compressive strength of graded crushed stone. Background technique [0002] Graded crushed stone is a typical road base material. It has no binder inside and is only made of aggregates of different specifications. Since the compressive strength can directly reflect the degree of aggregate embedding, it can be used for evaluation. Match crushed stone embedding ability and assist material optimization design. The basic principles and steps of the indoor test method for the compressive strength of graded crushed stone are as follows: (1) prepare the specimen according to the maximum dry d...

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Problems solved by technology

[0003] The applicant analyzed the above-mentioned laboratory test method for the compressive strength of graded crushed stones, and found the following defects: (1) Only through a large number of compressive strength laboratory tests can the relationship between the proportion of aggregates of various specifications and the compressive strength be revealed in depth, and the graded gravel can be realized. Optimum design of graded crushed stone materials results in a long design period for graded crushed stone materials; (2) It is difficult to observe the mesoscopic physical and mechanical properties of graded crushed stone materials under compressive loads

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