Method for determining the grain size distribution of coarse-grained soil with very large particles

By combining close-range measurement photography and image processing technology with particle analysis experiments, the accuracy and safety issues of particle size distribution of ultra-large coarse-grained soil were solved, achieving the effects of simplified operation and improved work efficiency.

CN116481958BActive Publication Date: 2026-03-24TIBET DATANG ZHALA HYDROPOWER DEV CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-14
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately, safely, and effectively determine the particle size distribution of ultra-large coarse-grained soils. Conventional sieve analysis tests cannot determine its particle size distribution, and excavating deep pits poses safety hazards and low work efficiency.

Method used

By combining close-range measurement photography and image processing techniques with particle analysis experiments, the particle size distribution of ultra-large coarse-grained soil was determined through the equivalent substitution method. This included close-range measurement and image processing to calculate the mass of large particles within a large square frame, sampling and weighing of small particles within a small square frame, and calculating the overall gradation through equivalent substitution using a magnification factor.

Benefits of technology

It achieves accuracy and safety in the particle size distribution of ultra-large coarse soil, simplifies the operation process, improves work efficiency, and avoids the safety hazards of deep and large pit excavation.

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Abstract

The application discloses a method for determining the particle size distribution of super-large-diameter coarse-grained soil. The method comprises the following steps: step one, respectively circumscribing a large square frame and a small square frame on the ground surface; step two, using close-range surveying photography and image processing technology to calculate the mass of each particle size group with a particle size greater than 100 mm in the large square frame; step three, performing a test pit sampling and particle analysis test, and weighing the mass of each particle size group with a particle size less than 200 mm in the small square frame; and step four, calculating and determining the mass percentage of each particle size group of the full-size super-large-diameter coarse-grained soil through equivalent replacement. The method has the advantages of accurate results, simple operation, improved work efficiency and safety guarantee.
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Citation Information

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