本文系用排队论的方法来计算应付故障的合理备用工作面数目.在计算中,采用有限输入,随到随服务的概型,输入流和输出流各按泊松和负指数分布. 此外,文中将新工作面的掘成和旧工作面采完日期之差,看成是一个正态分布的随机变量,从而计算出最有利的预期超前掘进量. 在数字分析的基础上,所导出的计算采掘平衡的方法,实际应用时也很简便. In this paper, we use the method of queuing theory to calculate the number of reasonable spare working face to deal with the fault.In the calculation, the finite input is used, and the input flow and the output flow are distributed according to the Poisson and negative exponential, In this paper, the difference between the digging of a new working face and the closing of the old working face is regarded as a normally distributed random variable, so as to calculate the most favorable expected heading amount.Based on the numerical analysis, The method of calculating the mining balance is also very simple in practical application.