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Theoretical and numerical studies of rock breaking mechanism by double disc cutters 被引量:2
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作者 Yiqiang Kang Renshu Yang +4 位作者 Liyun Yang Chengxiao Li Jun Chen Haonan Zhu Ning Liu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2023年第7期815-828,共14页
A plane mechanical model of rock breaking process by double disc cutter at the center of the cutterhead is established based on contact mechanics to analyze the stress evolution in the rock broken by cutters with diff... A plane mechanical model of rock breaking process by double disc cutter at the center of the cutterhead is established based on contact mechanics to analyze the stress evolution in the rock broken by cutters with different spacings. A continuous-discontinuous coupling numerical method based on zero-thickness cohesive elements is developed to simulate rock breaking using double cutters. The process, mechanism,and characteristics of rock breaking are comprehensively analyzed from five aspects: peak force, breaking form, breaking efficiency, crack mode, and breaking degree. The results show that under the penetrating action of cutters, dense cores are formed due to shear failure under respective cutters. The tensile cracks propagate in the rock, and then rock chips form with increasing penetration depth. When the cutter spacing is increased from 10 to 80 mm, the peak force gradually increases, the rock breaking range increases first and then decreases, the specific energy decreases first and then rises, and the breaking coefficient of intermediate rock decreases from 0.955 to 0.788. The area of rock breaking is positively correlated with the length of the tensile crack. Furthermore, the length of the tensile crack accounts for 14.4%–33.6% of the total crack length. 展开更多
关键词 disc cutter spacing Mechanical model Indentation experiment Continuous-discontinuous numerical method Fractal dimension
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