Abstract When the shield machine drives in the soil-rock composite strata, the cutters will be subjected to im?
pact loads at the soil-rock interface due to the uneven properties of ground, causing the strong vibration of the cutterhead, threatening the stability of the shield machine and surrounding environment. Based on the actual construction situation of a running tunnel of the Jinan metro line R2, three-dimensional dynamic numerical method is used to build the finite element model of single disc cutter cutting composite strata under different conditions. Then the impact load response of single disc cutter and the relationship between the impact load and influencing factors are analyzed under different conditions of penetration, cutting speed and rock hardness. The frequency distribution characteristics of the impact load response of single disc cutter are obtained by Fourier transform of time-history curve of load response under typical working conditions. The results shows that the vertical force on a single disc cutter is positive correlated with the penetration, cutting speed and rock hardness; the frequencies of loads on the disc cutter are mainly distributed in the range of 0-20 Hz, with increase of the penetration, cutting speed and rock hardness, the
amplitude of low-frequency load increases while a small amount of load frequency being distributed around 50 Hz.
Abstract：
When the shield machine drives in the soil-rock composite strata, the cutters will be subjected to im?
pact loads at the soil-rock interface due to the uneven properties of ground, causing the strong vibration of the cutterhead, threatening the stability of the shield machine and surrounding environment. Based on the actual construction situation of a running tunnel of the Jinan metro line R2, three-dimensional dynamic numerical method is used to build the finite element model of single disc cutter cutting composite strata under different conditions. Then the impact load response of single disc cutter and the relationship between the impact load and influencing factors are analyzed under different conditions of penetration, cutting speed and rock hardness. The frequency distribution characteristics of the impact load response of single disc cutter are obtained by Fourier transform of time-history curve of load response under typical working conditions. The results shows that the vertical force on a single disc cutter is positive correlated with the penetration, cutting speed and rock hardness; the frequencies of loads on the disc cutter are mainly distributed in the range of 0-20 Hz, with increase of the penetration, cutting speed and rock hardness, the
amplitude of low-frequency load increases while a small amount of load frequency being distributed around 50 Hz.
SUN Jiacheng1 LIAO Shaoming1 SUN Lianyong2 MEN Yanqing2 LIU Mengbo1
.Analysis of Impact Load and Vibration Response of Shield Disc Cutters in Soil-rock Composite Strata[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(5): 167-176
2020, Vol. 57 