Reinforced Soil Walls and Slope Reinforcement
2020
KHORFAKKAN - SHARJAH - U.A.E.
Government of Sharjah, Roads & Transport Authority.
General Mechanic Co. & Gulf Rock Engg. Co.
Jacobs, Halcrow International Partnership
NEW SHARJAH-KHORFAKKAN ROAD
Sectional detail of tunnel entrance stabilization with Terramesh MSE wall
During construction: Initial layer of Terramesh and Paralink geogrid placed
Close view of completed Terramesh wall at 1 location (out of total 10 locations)
Completed Terramesh wall at Al Saha Tunnel
Completed Terramesh at Al Raugh Tunnel
Problem
In order to reduce the travel distance between the cities Sharjah and Khorfakkan, a new road project was planned by the Government of Sharjah. This new road targets to reduce the travel time from 2 hrs to 1 hr, between these two cities. However, to accomplish this, the path of this new road must be aligned through the Hajar mountains and this foresees many engineering challenges during construction. Once completed, this 89 km long new road will consist of two sections. The first one is a two-lane road 65 km long. The second section lasts 24 km and here the road lies through the mountains, in which 5 tunnels are required (refer plan view). Due to the presence of weathered rock at the entrance and exit of the tunnels, it is required a robust, durable and aesthetically appealing stabilization solution.
Solution
From the previous successful experience of Terramesh system walls, the consultant approached Maccaferri Middle East to propose Terramesh MSE walls as a protection system for the tunnel entrance and exit locations. Terramesh will stabilize the weathered rock at tunnel mouth and additionally will create a bench to contain the probable falling rock from high overlying cutting. The gabion faced Terramesh MSE wall solution will allow the use of locally blasted stone from Tunnel excavation which is expected to give an immediate integration with the mountain surrounding. The project was awarded in two contracts with two different contractors. In order to achieve the consistency of the 5 tunnels done in parts by the two contractors, the client and consultant instructed them to approach Maccaferri to design the Terramesh MSE wall for their project scopes. Accordingly, considering two sides for the 5 tunnels, a total of 10 number small Terramesh walls had to be constructed. Maccaferri was involved in design, supply and site assistance of the project.
Used Products
TerraMesh
Maccaferri Terramesh® Family includes different facing options to build a Mechanically Stabilized Earth (MSE) structures and Reinforced Soil SlopesView
Nonwoven Geotextiles
Nonwoven geotextiles are flat textile structures consisting of synthetic fibres casually assembled by needle punching and/or thermal processes; theView