Stabilisation of Deep Soil Cut Using Micropiles and Soil Nailing

Abstract

The Railway route through south-west part of India (Konkan Railway) is passing through a hilly terrain. The route is developed by cutting the mountains in slopes and construction of tunnels. Many slopes along this route are very deep and steep. The region is characterized by lateritic soil. A heavy monsoon initiates some of the deep slope failures resulting in large magnitude of loss – both in money and life. The initial failure of one of the slope at Chainage 344/900 Km was stabilized by Gabion walls. West side of the Soil cutting was about 100 m long and a lateritic hilly slope steeply rises to 20 m above the track level at the collapse location. Initially the cutting line was 15m away from external track edge. However, after the heavy monsoon in June 2000, the soil slope collapses causing the lateral movement of the gabion wall and lateral shifting of the nearby railway track. The investigation was carried out to study the failure. The scheme of combination of conventional Soil Nails and Micropiles in addition to Gabion wall was proposed. The scheme was executed in Jan 2001 to May 2001. Load Tests were performed on Micropiles and Nails to verify the design. The slope is successfully stable for last 10 years

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