Rock Fragmentation Mechanism and Efficiency Under Inserted-tooth Roller Cutter by Rotary Cutting Test

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China Journal of Highway and Transport ›› 2018, Vol. 31 ›› Issue (10) : 150-159.

WU Fan¹, YIN Li-jun¹, ZHANG Hao^1,2, GONG Qiu-ming¹

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With the development of tunnel construction, the inserted-tooth roller cutter has been widely used for many types of excavation machines, including tunnel boring machines, raised drills, roadheaders, etc. Thus, it is significant to study the rock fragmentation mechanism and efficiency under the inserted-tooth roller cutter for improving mechanical excavation efficiency. For this issue, rotary cutting tests for the inserted-tooth roller cutter with diameter of 12 inches were conducted using the mechanical rock fragmentation platform of Beijing University of Technology. The rock sample used in the rotary cutting test was Beishan granite with dimensions 1000 mm×1000 mm×600 mm. A series of rotary cutting tests for the different rows of teeth and the whole cutter were conducted under different penetration depths. During the rotary cutting tests, the cutting force, rock chips, and rock fragmentation efficiency were measured collected and analyzed. Moreover, the distribution characteristics of cracks induced by the cutters were explored by fluorescence experiment to verify the rock fragmentation mechanism. The main conclusions can be summarized as follows. ① The mode of rock fragmentation by inserted-tooth roller cutter in a "progressive" way, in which rock breakage propagated from the adjacent single spherical tooth with small spacing to adjacent rows of teeth with large spacing; ② For the tests on different rows of teeth, the rock fragmentation efficiency of the third row is the highest. For the test of the whole cutter, the rock fragmentation is highest with penetration depth of 1.5 mm; ③ Based on the results of the fluorescence experiment, the distribution characteristics of the cracks induced by the cutter were identified, and there are obvious differences in the propagation direction and range of cracks under each row of teeth. The rock fragmentation efficiency obtained from crack distribution coincided with the analysis of cutter force and rock chips. The conclusions of this study can offer some guidance for the optimization of cutter layout, cutter type, and operating parameters of excavation machines.

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tunnel engineering / rock fragmentation efficiency / rotary cutting test / fluorescence experiment / inserted-tooth roller cutter / rock fragmentation mechanism

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WU Fan, YIN Li-jun, ZHANG Hao, GONG Qiu-ming. Rock Fragmentation Mechanism and Efficiency Under Inserted-tooth Roller Cutter by Rotary Cutting Test[J]. China Journal of Highway and Transport, 2018, 31(10): 150-159

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2018-03-08	2018-10-20
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2018-11-07

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