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Experimental and numerical investigation of roadheader for breaking rock containing predrill holes
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-03-31 , DOI: 10.1002/ese3.682 Zenghui Liu 1, 2 , Fusheng Ni 1, 2 , Changyun Wei 1, 2 , Hongbin Li 1, 2
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-03-31 , DOI: 10.1002/ese3.682 Zenghui Liu 1, 2 , Fusheng Ni 1, 2 , Changyun Wei 1, 2 , Hongbin Li 1, 2
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The purpose of this study is to investigate the dynamic characteristics of a roadheader for breaking rocks containing different numbers and sizes of predrill holes. A series of experiments was performed to quantitatively measure the cutting torque, thrust force, and specific energy during the cutting of a cutterhead. Experimental results show that the cutting torque, thrust force, and specific energy decrease as the number of predrill holes increases. When the number of predrill holes is nine, type 9‐2 exhibits the minimum cutting load and specific energy. In addition, three‐dimensional numerical simulations were conducted using LS‐DYNA software, and the results were further validated with experimental data. Numerical results reveal that the confining pressure has significantly affected the rock‐breaking process, and under the confining pressure of 10 MPa, values of the cutting torque and thrust force are 8.9% and 8.6% higher than those without confining pressure. The optimal diameter of the predrill holes is set as 12.5% of the maximum diameter of the cutterhead. Furthermore, the number of the holes is set as six, that is, one central hole and five circumferential holes, with a diameter of 45 mm according to the arrangement of type 6‐1.
中文翻译：
掘进机破碎含预钻孔岩石的试验与数值研究
这项研究的目的是研究掘进机破碎包含不同数量和尺寸的预钻孔的岩石的动力特性。进行了一系列实验，以定量测量切割刀头时的切割扭矩，推力和比能。实验结果表明，随着预钻孔数量的增加，切削扭矩，推力和比能量降低。当预钻孔的数量为9个时，9-2型具有最小的切削负荷和比能。此外，使用LS‐DYNA软件进行了三维数值模拟，并用实验数据进一步验证了结果。数值结果表明，围压对破岩过程有显着影响，在限制压力为10 MPa的情况下，切削扭矩和推力的值分别比没有限制压力的情况高8.9％和8.6％。预钻孔的最佳直径设置为刀盘最大直径的12.5％。此外，根据类型6-1的布置，孔的数量设置为六个，即一个中心孔和五个圆周孔，直径为45 mm。
更新日期：2020-03-31
中文翻译：
掘进机破碎含预钻孔岩石的试验与数值研究
这项研究的目的是研究掘进机破碎包含不同数量和尺寸的预钻孔的岩石的动力特性。进行了一系列实验，以定量测量切割刀头时的切割扭矩，推力和比能。实验结果表明，随着预钻孔数量的增加，切削扭矩，推力和比能量降低。当预钻孔的数量为9个时，9-2型具有最小的切削负荷和比能。此外，使用LS‐DYNA软件进行了三维数值模拟，并用实验数据进一步验证了结果。数值结果表明，围压对破岩过程有显着影响，在限制压力为10 MPa的情况下，切削扭矩和推力的值分别比没有限制压力的情况高8.9％和8.6％。预钻孔的最佳直径设置为刀盘最大直径的12.5％。此外，根据类型6-1的布置，孔的数量设置为六个，即一个中心孔和五个圆周孔，直径为45 mm。
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