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Mumbai-Pune, India’s first expressway, which crosses the mountainous and rugged Deccan Trap Province, suffered from a large amount of rockfall and major landslides in 2003 and 2004. A significant number of accidents and fatalities have occurred on the expressway as a result of such events. On the basis of frequency and magnitude of the recorded incidences of rockfall, seventeen critical areas of the road have been deemed in need of investigations and mitigation. One of the problematic areas that suffered from rockfall and subsidence is at km 41 on the expressway, adjacent to a tunnel (Adoshi). This location has been chosen for detailed study. This area extends for 500 m along the expressway, and the embankment has subsided by 2 to 3 m along the entire length. Based on the geological, geomorphologic and geotechnical investigations, causative factors for rockfall and subsidence at this location have been established. This paper presents the field investigations, probable causes, stability analysis and remedial measures for controlling the subsidence and rock fall.

International Journal of Geoengineering Case Histories ©, Vol. 2, Issue 1, p. 24
Geotechnical Engineering Division, Central Road Research Institute, New Delhi, India
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