Method for determining rockfill material filling standards and detecting on-site filling quality based on fractal theory

A fractal theory and rockfill technology, applied in the field of water conservancy and civil engineering, can solve problems such as incomplete theory and restrict the development of modern high dams, and achieve the effect of ensuring the safety of construction and operation.

Active Publication Date: 2018-01-05
HOHAI UNIV
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Problems solved by technology

It can be seen that the current filling standards for rockfill bodies are still incomplete in theory, and there are also

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  • Method for determining rockfill material filling standards and detecting on-site filling quality based on fractal theory
  • Method for determining rockfill material filling standards and detecting on-site filling quality based on fractal theory
  • Method for determining rockfill material filling standards and detecting on-site filling quality based on fractal theory

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example 1

[0061] This implementation case combines the on-site grading and scale grading of dam rockfill materials in a certain project, and conducts relative density tests and compression tests. According to the method suggested by this patent, the dual control indicators of porosity and relative density of rockfill materials are determined. The project The dam is located in a strong earthquake area, and the design index for the relative density of the rockfill material is 0.75. figure 1 There are 109 groups in total for the on-site rockfill filling gradation.

[0062] Step 1. Statistical analysis was carried out on the particle mass distribution of 109 groups of rockfill material gradations in the field, and the fractal distribution formula shown in formula (1) was tested. The average correlation coefficient was greater than 0.96, which conformed to the fractal distribution characteristics. The fractal dimensions of the upper envelope, average line and lower envelope are 2.615, 2.542 ...

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Abstract

The invention relates to a method for determining rockfill material filling standards and detecting on-site filling quality based on a fractal theory. The method comprises verifying a particle fractaldistribution model, building a relationship between grading parameters and dry density or porosity, building a relationship between grading parameters and a compressive modulus, determining rockfillmaterial filling grading or a grading envelope line satisfying compressive modulus requirements, acquiring a filling porosity index or an index range, carrying out a penetration test, detecting a permeability coefficient, if the permeability coefficient does not satisfy the permeability requirement, reducing and adjusting a grading range until the permeability coefficient satisfies the permeability requirement, and verifying whether the filling porosity under the condition of design relative density satisfies the filling porosity requirement. The method provides double control standards of porosity and relative density, controls rockfill body filling quality, comprehensively considers the influence produced by the grading of the rockfill material, the characteristics of the parent rock anda compaction degree on the deformability of the rockfill body, provides the reliable basis for the whole stability of the rockfill dam and effective deformation control and ensures the construction and operation safety of the dam.

Description

technical field [0001] The invention relates to a filling quality evaluation standard that can be widely used in water conservancy and hydropower, civil engineering and traffic engineering rockfill materials and implementation issues, and belongs to the technical field of water conservancy and civil engineering. Background technique [0002] The construction and operation safety of a high earth-rockfill dam requires strict deformation control of the dam body and coordinated deformation design of each filling area, which requires an accurate grasp of the engineering characteristics of the rockfill body. For rockfill materials or gravel materials, their engineering characteristics mainly depend on three aspects: first, the characteristics of the dam material itself, that is, the characteristics of the parent rock and the gradation characteristics, which are the basis for determining the quality of the particle filling relationship and the degree of particle crushing. Approxima...

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Application Information

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IPC IPC(8): G01N9/36G01N15/08G01N15/02
Inventor 朱晟
Owner HOHAI UNIV
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