Abstract Based on the 95 cases ext racted f rom the database of RMR , the linear regression formula between the
index of tunnel character and it s stand2up time is built . The result s confirm that the stability of a tunnel is domi2
nated 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 stand2up 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.
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Received: 09 November 1999
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