Coarse particle contraction rule method based on fractal theory

Abstract

The invention discloses a coarse particle contraction rule method based on fractal theory. The coarse particle contraction rule method based on fractal theory is suitable for particle grade contraction of water conservation and civil engineering coarse particle, can effectively weaken coarse particle contraction effete. As for naturally formed sand-gravel material and generated blasting heap rockfill material through parameter design, the particle grading basically conform to Talbot grading curve, the particle size accord with fractal distribution, and good compacting performance is possessed. The coarse particle contraction rule method is based on the fractal theory, by introducing a grading parameter and a fractal dimension, and puts forward a contraction grading formula that physical mechanics condition is basically uniform on condition that original grading coarse particle appoints maximum control particle diameter dmax. The coarse particle contraction rule method based on the fractal theory specifically comprises the following steps: (1) calculating fractal dimension DO of the original grading; (2), through a relative density ratio test of corresponding ingredient of maximum control particle diameter, and determining a critical fractal dimension DL; (3) calculating grading parameter A according to relationship between the DO and the DL; (4) substituting the grading parameter A and the DO into the grading formula, and obtaining contracted target grading.

Description

1 technical field [0001] The invention aims at the scaling problem of coarse grain materials with fractal characteristics in water conservancy and civil engineering, and in particular relates to a method for scaling coarse grain materials based on fractal theory, which belongs to the fields of water conservancy and civil engineering. 2 background technology [0002] With the widespread use of large vibratory rolling machines, the gradation range of coarse aggregates used in engineering has become wider. For example, the maximum control particle size of rockfill dam materials has reached 0.8-1.0m, far exceeding the laboratory test equipment. The allowable size (at present, a large triaxial instrument with a diameter of 30cm is commonly used in China, and the maximum control particle size is 5-6cm), which cannot be directly used for indoor testing. It is necessary to scale down the original gradation of coarse aggregates to reduce it to indoor testing equipment. within the car...

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