Method for determining relative breakage rate of calcareous sand under different stress paths

Abstract

The invention relates to a method for determining the relative breakage rate of calcareous sand under different stress paths. The method comprises the following steps: taking a calcareous sand sample; carrying out isotropic compression test on the calcareous sand sample under different confining pressures to obtain experimental parameters of the isotropic compression test and crushing parameters when the average effective principal stress value is 1 under the isotropic compression test; calcareous sand samples with the same grading and initial void ratio are taken to be subjected to an equal average effective principal stress test, and equal average effective principal stress test parameters and crushing parameters under the equal average effective principal stress test when the maximum deviatoric stress value is 1 are obtained; and drawing a relative crushing rate surface of calcareous sand and the like. According to the invention, each parameter can be reliably obtained in an indoor test, the result is accurate, and the parameters have universality; the experiment difficulty is greatly reduced, the determination time is greatly shortened, the application conditions and application scenes are widened, and the method has universality and is more suitable for the actual situation of the calcareous sand; the influence of the stress path on particle crushing is solved, and the influence of the stress path on particle crushing better conforms to actual influence factors of particle crushing.

Description

technical field [0001] The invention relates to the technical field of determining the relative crushing rate of granular soil, in particular to a method for determining the relative crushing rate of calcareous sand under different stress paths. Background technique [0002] Calcareous sand is a granular soil with high void ratio, low grain strength, irregular grain shape, and abundant internal voids. This kind of rock and soil material is prone to particle breakage under load, and particle breakage has an important impact on the strength, compressibility and critical state of calcareous sand. With the rapid development of marine economy, the continuous improvement of marine resource development capabilities and the improvement of marine ecological environment protection awareness, the number and scale of marine projects built on islands and reefs with calcareous sand as the main sediment are increasing, and calcareous sand particles are broken. This phenomenon has graduall...

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Problems solved by technology

[0009] 1. Since the stress path will also affect the particle breakage characteristics of calcareous sand, the current research results on the relationship between the influence of shear strain on particle breakage and the effect of stress path on the particle breakage characteristics of calcareous sand are still incomplete. Very limited, so that it is impossible to establish a functional relationship that can reflect the relationship between stress, strain, stress path and particle breakage;

[0010] 2. Since the determination of the relative crushing rate of calcareous sand in the prior art depends on specific acquisition methods, in marine engineering, calcareous sand is often in a complex marine environment and harsh loading conditions, and the use of multiple acquisition paths is It will greatly increase the difficulty of the experiment and the measurement time of the relative breakage rate, thus limiting the application conditions and application scenarios, and is not universal;

[0011] 3. Since the acquisition of parameters of calcareous sand in the prior art depends on specific acquisition methods, the acquired parameters are not universal and cannot provide reference value for re-application;

[0012] 4. Since the determination of various parameters of calcareous sand in the existing technology still relies on on-site sampling and personnel operating experience, it cannot be standardized, so that the accuracy of the final parameters is not high

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