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  Challenges in Planning and Designing of New Railway Tunnel Parallel to Existing Tunnel between Laxmipur Road Station and Baiguda Station

  This paper discusses challenges in planning, designing of new railway track parallel to existing track between Laxmipur road Station and Baiguda Station in Odisha State of India. Numerical model of the existing tunnel, proposed tunnel and surrounding rockmass is prepared and analysed. The results of this analysis indicate that the stresses developed in the rock mass surrounding both the tunnels due to excavation of proposed tunnels are much smaller than the permissible stresses. However, during excavation of new tunnel the blasting vibrations developed will adversely affect the old unlined tunnel. The effect of blasting vibration velocity experienced by the existing tunnel will be more due to presence of hard rock with less jointed structure. It may cause widening of existing cracks, spalling, fissures etc. To mitigate this risk during construction of new tunnel the safe clear distance between the two tunnels is found to be 22 m.

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