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为了建立粗粒料在颗粒破碎下级配曲线的预测模型,将粗粒料的颗粒破碎划分为3个阶段,并在模型建立过程中引入裂离比Rk的概念。结合石英砂岩、片麻岩、砂板岩、角砾岩、砂砾岩的颗粒破碎试验资料,在进行等比级数简化假设的基础上,分析裂离比与围压、干密度、粒径间的关系表明:当粒径为10~60 mm且围压为0.0~1.6MPa时,对于不同的颗粒材料,3-Rk均呈现出线性化关系,且该关系存在一个斜率折点。当颗粒粒径小于10 mm时,对磨圆后砂砾岩的试验资料进行分析发现,3-Rk的关系在围压为0.0~1.2 MPa范围内趋于整体线性。综合考虑围压、母岩强度与原始级配对裂离比的影响,当颗粒粒径为10~60 mm时,对于同粒组下的片麻岩、砂板岩、弱风化石英砂岩,其裂离比的变化规律具有归一性。由此提出裂离比Rk的预测计算公式,并初步给出参数取值范围,使基于裂离比概念的粗粒料级配曲线预测成为可能。
In order to establish the predictive model of coarse grained material under graded crushing, the particle crushing of coarse grained material is divided into three stages, and the concept of split ratio Rk is introduced in the model building process. Combined with the granule crushing test data of quartz sandstone, gneiss, gneiss, breccia and conglomerate, based on simplification of geometric series, the relationship between fission ratio and confining pressure, dry density and particle size Shows that when the particle size is 10-60 mm and the confining pressure is 0.0-1.6 MPa, 3-Rk shows a linear relationship with different granular materials, and the relationship has a slope turning point. When the particle size is less than 10 mm, the experimental data of the rounded conglomerate show that the relationship of 3-Rk tends to be linear in the confining pressure range of 0.0 ~ 1.2 MPa. Considering the influence of confining pressure, strength of parent rock and splitting ratio of original stage, when the grain size is 10-60 mm, the gneiss, sandstone, weakly weathered quartz sandstone under the same granulite group, The change rule of the ratio is normalized. Based on this, the prediction formula of the Rk ratio is proposed, and the range of parameters is given initially to make it possible to predict the grading curve of coarse aggregate based on the concept of split ratio.