【摘要】 利用RMR分级数据库 ,通过对其中有效的 95个实例的分析 ,建立了隧道特征指标与岩体站立时间的线性关系 ,证实了围岩的稳定程度主要受岩体质量的控制 ,隧道的跨度只起次要作用。结合我国铁路隧道中的围岩压力与站立时间的概率分布相互独立的特点 ,推出了初期支护和二次衬砌各自在承担围岩压力时的比例计算公式更多还原

【Abstract】 Based on the 95 cases extracted from the database of RMR , the linear regression formula between the index of tunnel character and its stand up time is built. The results confirm that the stability of a tunnel is dominated by the rock mass quality, while the effect of the width/span of the tunnel on the stability may be negligible. Considering the mutual statistical independence of ground pressure and stand up time in the railway tunnelling of China, the formulae of ratios in which primary support and permanent lining of a tunnel withstand ground pressure are given.更多还原