Optimization method of particle gradation of blasting rockfill materials based on fractal theory

A technology of fractal theory and optimization method, applied in the field of earth-rockfill dam construction, can solve problems such as quantitative evaluation of the compaction characteristics of rockfill materials

Inactive Publication Date: 2011-12-14
HOHAI UNIV
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Problems solved by technology

[0005] In order to avoid the disadvantage that the compaction characteristics of the rockfill material cannot be quantitatively evaluated by using the two indexes of the unevenness coefficient Cu and the curvature coefficient Cv in the particle gradation design of the blasting rockfill material, the purpose of the present invention is to provide a more The method of determining the gradation of blasting rockfill materials with the characteristics of easy comp...

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  • Optimization method of particle gradation of blasting rockfill materials based on fractal theory
  • Optimization method of particle gradation of blasting rockfill materials based on fractal theory
  • Optimization method of particle gradation of blasting rockfill materials based on fractal theory

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Embodiment

[0067] This implementation case is a certain project that has been built. The blasting test adopts the deep hole step blasting method. The rockfill material in the on-site rolling test is compacted with a YZT16 vibrating roller. The number of rolling times is 8 times, and the thickness of the rolling layer is 80cm.

[0068] 1. The relationship between compacted dry density and particle size fractal dimension

[0069] During the on-site vibration rolling test, the dry density value and the particle size distribution of the particle gradation of the rockfill material detected by the pit method are shown in Table 1. According to the particle size distribution of each group of rolling test rockfill materials, according to formula (I) The corresponding particle size fractal dimension D is also listed in Table 1.

[0070]

[0071] Table 1

[0072] The fractal dimensions of particle size before and after rolling and the measured values ​​of dry density of rockfill materials obtai...

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Abstract

The invention provides a method for optimizing grain composition of a blasting rockfill material based on a fractal theory. The method is characterized by comprising the following steps of: establishing a function relation among the grain fractal dimension, compacted dry density and average particle size of the rockfill material, and further establishing a relation between a blasting scheme or parameter and the compacted dry density of a field rockfill material according to a correction Kuz-Ram model for forcasting the blasting fragment size distribution of a rock mass; and obtaining an optimal grain composition of a dam construction rockfill material which is easier to compact by adjusting the blasting scheme or parameter. The method can be applied to optimized design of the grain composition of the blasting rockfill material.

Description

technical field [0001] The invention belongs to the technical field of earth-rockfill dam construction in the water conservancy and hydropower industry, and relates to the blasting and mining of dam-building rockfill materials and on-site compaction quality control, in particular to the reasonable determination of particle gradation of dam-fill rockfill materials. Background technique [0002] Earth-rock dams are the oldest dam type in the world. In the history of various ancient civilizations in the world, there are records of people using local earth and rocks to build dams to store water and resist floods. With the rapid development of soil mechanics and geoengineering, earth-rock dams have become the most widely used dam type so far due to their low cost and good adaptability to geological conditions since the 1940s. The development of modern industry requires the construction of taller earth-rock dams. The Quoich dam built in 1958, the Brownlee dam built in 1959 and the...

Claims

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Application Information

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IPC IPC(8): E02B7/06
Inventor 朱晟冯燕明冯树荣余廷张志伟宁永升
Owner HOHAI UNIV
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