Abstract 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.
Abstract：
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.
ZHOU Peng1 YAN Feng1 SUN Jian1 HE Enguang1,
2 TIAN Junxing1
.Study on the Adaptation of Different Rolling Velocities of Disc Cutters to Rocks with Joint Characteristics[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(3): 190-200
2022, Vol. 59 