Mass Gravity Retaining Walls
2020
SATARA-KOLHAPUR - MAHARASHTRA - India
Maharashtra State Road Development Corp (MSRDC)
GABION WALLS AT SATARA-KOLHAPUR ROAD
GABION WALLS AT SATARA-KOLHAPUR ROAD_0
GABION WALLS AT SATARA-KOLHAPUR ROAD_1
GABION WALLS AT SATARA-KOLHAPUR ROAD_2
GABION WALLS AT SATARA-KOLHAPUR ROAD_3
Drawing 1: Typical cross sectional drawing
Problem
National Highway 4, running between Mumbai,Pune-Satara-Kolhapur to Kagal Maharashtra State Border is an important highway in western Maharashtra. To improve the National Highways network throughout the country, the Govt of India announced the Golden Quadrilateral project and entrusted its implementation to NHAI. The four laning of Satara-Kolhapur to Maharashtra state border section was awarded to MSRDC by NHAI. MSRDC approached Maccaferri for retention of the sides of approach embankments as well as wing walls from Kolhapur to Kanegaon which was designated as Package 3 of this Project. The original soil present at the site was clay. It was feared that the hydraulic forces existing in the site may cause instability for the retaining structures. There was also the probability of immediate settlement and consolidation settlement. The major work was the construction of wing walls for the bridges across river Warana and Ghunki which was existing in the stretch between Satara and Kolhapur. The properties of the existing foundation soil were Y= 17 KN/m3, phi= 0 degrees, c= 40 KN/m2. The maximum height of wall was approximately 13m.
Solution
Conventional Structures like concrete walls were ruled out since it may require deep foundation because of the existence of the clay. So, gabion walls were adopted as the best alternative as they are flexible, permeable and would make the structure more stable. As Gabions are free draining by nature, the excess pore water pressure gets dissipated. Since the existing soil is found to have poor shear parameters, a foundation improvement scheme was carried out to a depth of 2m below ground level to get good factor of safety in sliding, bearing and overall stability. The properties of the replaced soil were Y =20 kN/ m3, phi= 34 degrees & c= 0 KN/m2. The structure was designed with consideration of seismic coefficients of a(h) = 0.04 & a(v) =0.02 assuming an importance factor of 1.5. The walls were built at a very good speed. This area occasionally experiences flash floods which is the most critical condition for any retaining structure. The gabion walls has successfully withstood such adverse conditions.
Used Products
Gabions
Maccaferri Gabion is a Double-Twisted “DT” wire mesh container of variable sizes uniformly partitioned into internal cells, interconnected with othView