The service life of the main bearing cannot be
calculated resulting from the difficulty in load spectrum prediction during the
operation of the fullsection hard rock tunnel boring
machine(TBM). Therefore, a method to predict the load spectrum of the TBM main
bearing based on the disc cuttermain bearing force
flow model is studied. Based on tunnel engineering geological conditions, a
prediction model of disc cutter rock breaking load is established based on code
security module model and Akisanto Saburo model. Based on TBM operating
conditions and disc cutter distribution on cutterhead, a cutterheadmain bearing force flow model under multiple working conditions is
established based on theoretical calculation model and finite element analysis
model to obtain the original load. Considering the influence of the strong
impact working environment on the load spectrum of TBM, the impact load
coefficient is introduced and the calculation model is established to obtain
the load spectrum of the main bearing. The results show the following: (1) The
working time of TBM under the full thrust accounts for 65%. (2) The axial force
and overturning moment vary greatly under the four working conditions, whereas
the radial force is stable. (3) Under the full thrust, the main bearing mainly
bears the axial force, up to 14 374 kN, which is 5% different from the result
of finite element analysis. The calculation results are compared with the
actual construction data of TBM to verify the accuracy of the model and provide
a reference for the design and life prediction of the TBM main bearing.
ZHOU Jianjun, LI Shuaiyuan, JIANG Yihui, YANG Yandong, CHENG Yonglong
. Force Analysis and Application of Main Drive Bearing
of Tunnel Boring Machine[J]. Tunnel Construction, 2023
, 43(S1)
: 522
-529
.
DOI: 10.3973/j.issn.2096-4498.2023.S1.062
