考虑炭质泥岩颗粒破碎的级配演化预测模型OA北大核心CSTPCD

In order to accurately predict the change of particle breakage and gradation curve of carbonaceous mud-stone during impact loading,a mathematical model of"impact energy and water content-crushing index-gradation distribution"of carbonaceous mudstone was established.Firstly,by introducing a single parameter grading equation that can describe the continuous grading curve,the mathematical relationship between the single parameter grading equation and the particle breakage rate Bw is established,and the conversion of"crushing index-gradation distribution"is realized.A series of impact tests with different water content and impact energy were car-ried out by setting the continuous gradation of two typical carbonaceous mudstone fillers of inverse S type and hyper-bolic type.The results show that the particle breakage rate of carbonaceous mudstone increases with the increase of initial water content when the impact energy is constant,regardless of whether the initial gradation of carbonaceous mudstone is hyperbolic distribution or inverse S-type distribution.When the water content is constant,the particle breakage rate of carbonaceous mudstone increases with the increase of impact energy.When the impact energy rea-ches 6.075 kJ,the particle breakage rate remains basically unchanged,and the particle content of each particle group tends to be a stable proportion relative to the initial content.According to the relationship between the particle breakage rate Bw of carbonaceous mudstone in the impact process and the initial moisture content and impact ener-gy,the mathematical relationship between the particle breakage rate and the moisture content and impact energy is established,and the conversion of"impact energy and moisture content-crushing index"is realized,A mathemat-ical model of"impact energy and water content-crushing index-gradation parameter"was established by using the crushing index as the medium,and it was found that the model can better reflect the evolution law of the gradation curve of carbonaceous mudstone under different impact energy and water content conditions.