Abstract
One of the reasons rock mass classifications is popular over the years because they are easy to use and provide vital information about rock mass characteristics. Classification also leads in making fast decisions during tunneling. Thus, rock mass classification is an amazingly successful approach. There are several correlations that are based on measured support pressures and other related parameters from several Indian tunnels that have steel rib support. Detailed field studies have been carried out for eight tunneling projects located in the Himalayas and peninsular India. Two sets of empirical correlations for estimating support pressure for tunnel sections under non-squeezing and squeezing ground conditions have been developed using N and the measured values of support pressures, the tunnel depth (H), the tunnel radius (a), and the expected tunnel closure (ua) from 25 tunnel sections. In addition, prediction of support pressures in tunnels and the effect of tunnel size on support pressure are the two most important problems in tunnel mechanics and have attracted the attention of many researchers.
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