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  Soil Mass Quality Rating System for Design of Tunnel SupportBased on Observations in Tehran Eastern Main Sewerage Tunnel

  The need to provide an index of subsurface soil behavior which would includeallowances for undisturbed soil strength, soil texture and its matrix properties, discontinuityfrequency, groundwater condition together with stress condition at the depths encountered has ledthis author to develop a soil mass classification system to isolate in a qualitative manner categories ofsoil which, under a particular set of engineering constraints, will behave in a similar way. For aparticular soil stratum, a numerical assessment is made within designated limits of the quality of thesoil as it relates to a particular parameter. These numbers are then summed to give an index numberwhich can be related to the behavior of soil mass culminating in the prediction of excavationprocedures and support system density for a 3.5m diameter hand excavated tunnel. The classificationprovided very good feed-back for the conventional tunnelling method, including stand-up time andsupport requirements.

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