基于载荷分布和统计的TBM主轴承寿命计算

Life Calculation of TBM Main Bearing Based on Load Distribution and Statistics

以吉林中部引水工程总干线二标段全断面岩石掘进机(tunnel boring machine,TBM)主轴承为研究对象,在考虑联接结构刚度及边界条件影响的条件下,基于L-P理论并引入切片法计算了主轴承的额定寿命.对TBM的工作掘进推力记录进行统计分析,得到了基于Miner累积损伤理论的主轴承使用寿命.结果表明:主轴承内部载荷分布受连接结构刚度影响较大,采用切片法计算其额定寿命较为合理.适当调整连接结构的形式及尺寸可大幅改善主轴承滚道载荷分布均匀性并提高其额定寿命.推进力载荷统计近似为截断正态分布,可根据额定推力对主轴承的使用寿命进行预估.

With the stiffness characteristics and boundary conditions considered,L-P theory and slicing method were introduced to calculate the rated life of the main bearing in the tunnel boring machine（ TBM） used in the second section of the diversion project＇s main line for the central region of Jilin province. The statistical analysis of TBM thrust force record was carried out to calculate the life of the main bearing based on Miner＇s cumulative damage theory. The results showed that the internal load distribution of the main bearing is greatly affected by the stiffness characteristics of the connection structures,and the slicing method is suitable well for calculating the main bearing＇s rated life. With the modified size and form of the connection structure,the uniformity of raceway load distribution is improved greatly and the main bearing＇s rated life is extended. In statistics,the TBM thrust forces are truncated normal distribution approximately,and the service life of the main bearing could be calculated based on the rated thrust force.