滚刀不同滚压速度对含节理特征的岩石适应性研究

Study on the Adaptation of Different Rolling Velocities of Disc Cutters to Rocks with Joint Characteristics

为揭示岩石节理特征下滚刀滚压速度变化对破岩效率的影响,明确滚刀滚压速度与岩石节理特征共同变化下的岩石比能变化规律,采用ABAQUS有限元软件,选择花岗岩为研究对象,建立破岩模型,模拟滚刀滚压速度变化下的破岩过程,分析不同滚压速度与节理特征下滚动力的大小,以及比能变化趋势和破碎效果。试验结果表明:岩石节理间距一定时,滚压速度越大,滚刀所受平均滚动力越大,破岩比能越大;在滚压速度一定时,节理间距从120 mm增至200 mm时,破岩比能增大;岩石节理间距为120 mm时,比能变化平稳;固定岩石节理间距下,节理倾角变大,破岩比能呈现先增大后减小的趋势;当岩石节理间距与节理倾角一定时,滚压速度增大,滚刀平均滚动力增大,比能增大,破岩效率降低。滚刀滚压速度对节理岩石破碎效率有重要影响;节理特征对破碎效率有较大影响。

This paper is to demonstrate the impact of rolling velocity variation of the disc cutter on the efficiency of breaking rock with joint characteristics,and to verify the changing pattern of rock specific energy under the combined variation of the rolling velocity of the disc cutter and the joint characteristics of the rock.The ABAQUS finite element software is used to establish the rock-breaking model based on granite,simulate the rock-breaking process under rolling velocity variation,and analyze the magnitude of the cutter rolling force under different rolling velocities and joint characteristics,as well as the trend of specific energy change and breaking effect.The test results show that:when the spacing of the rock joints is of a fixed value,the greater the rolling velocity is,the greater the average rolling force the cutter will bear,and the greater the specific energy of rock-breaking it will have;At a constant rolling velocity,the rock-breaking ratio increases when the spacing of the joints increases from 120 mm to 200 mm;The variation of specific energy is stable when the spacing of the rock joints is 120 mm;Under a fixed spacing value of the rock joints,the dip angle of the joints becomes larger,and the rock-breaking ratio shows a trend of rising before dropping;When the spacing and dip angle of the rock joints are fixed,the rolling velocity and the average rolling force both increase,as well as the specific energy,while the rock-breaking efficiency decreases.The rolling velocity of the disc cutter has a significant impact on the breaking efficiency of rocks with joint development,while the characteristics of the joints also have a large impact on the breaking efficiency.