YANG Cheng1,LAI Yuanming1,2,WANG Xu1,GAO Jianqiang2,WEI Zhoubin3
JOURNAL OF VIBRATION AND SHOCK. 2018, 37(8): 28-33.
Aiming at the Yellowstone sandpebble formation under the first shield of Lanzhou Subway, this paper selected a linear elastic model and extended the linear DruckerPrager plasticity model to simulate the constitutive relationship of pebble material and established the numerical calculation model of shield rock breaking in rockpebble formation. The rock breaking effect on the Yellow River pebble stratum in several different situations was analyzed when Blade cutting speed was 0.6 m / s, 0.8 m / s, 1.0 m / s, 1.2 m / s; cutting depth was 6 mm, 9 mm, 12 mm, 15 mm, 18 mm; cutter spacing was 12 cm, 16 cm, 20 cm, 24 cm; The rake angle was 10 °, 15 °, 20 °, 25 °. According to the calculation results, when the blade rake angle is 20 °, the pebble equivalent stress suddenly increases to provide rock breaking stress, and the rock breaking effect is the best. In addition, the rock breaking effect was analyzed when the hob pitch is 8 cm, 12 cm, 16 cm, 20 cm, 25 cm, 30 cm and 36 cm respectively. The rock breaking effect was the best when the hob pitch was between 12 cm and 16 cm.