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

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...

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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 compaction is based on the fractal theory, taking the fractal dimension D of the particle size of the dam rockfill as an index, and establishing the relationship between the blasting plan of the rock mass in the stockyard and the rolling quality of the rockfill materials on site. Relational expression, by adjusting the rock mass blasting parameters to improve the rockfill compaction quality, so as to optimize the particle size distribution of blasting rockfill materials

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