DISRIBUTION OF STRESSES AROUND ADJACENT TUNNELS USING REFLECTED POLARISCOPE (PART 2)

 

BY

Sabry A. Abdo*, Mohamed A.Y.**, Hassan A.A.El-Sageer***1, Mamdouh Y.H.***

ABSTRACT:

The deformation and support load of the first tunnel can be changed due to the excavation of the

second tunnel, when it is in the vicinity of an existing tunnel. Severe interaction effect between

adjacent tunnels can happen, especially in poorly cemented or heavily fractured rock condition.

Severe interaction may endanger the stability of tunnel. Therefore, the traditional method of

tunnel alignment and support design based on topography in the portal area, available right of

way, simple stress analysis by elastic method and empirical rock classification method can not

properly determine the spacing between tunnels and the support required in order to avoid the

interaction effect.In this work, theoretical studies by numerical method coupled with tunnel

models were carried out to establish the criterion for judging the severeness of interaction effect

between tunnels specially when the shape of the excavated tunnels is considered.

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