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Clarke Lake Road Bypass

Introduction Challenge Solution Results Gallery The Nilex Advantage

Highway construction costs are reduced using biaxial geogrid.

The Clarke Lake Road bypass was constructed to divert truck traffic from residential areas and provide a shorter alternate route for industry traffic.

Location

Fort Nelson, British Columbia

Project Partners

Owner: BC Ministry of Transportation
Consultant: AMEC Americas Ltd. & Thurber Engineering
Completion Date: Winter 2004

Challenge

The new four kilometre, two-lane road was to be constructed over an undeveloped area of vegetation overlying soft clay. Complicating the project was a short, three month window for design and construction of the road due to weather constraints. The owner wanted to keep transport and material costs under control by using an alternative to aggregate-intensive construction methods.

Solution

With the assistance of Nilex and Tensar Earth Technologies, and using Tensar’s SpectraPave2 software (for subgrade improvement and cost benefit analysis), the owner and engineers were able to evaluate the benefits of incorporating Tensar® Biaxial (BX) Geogrid reinforcement into the road structure.

BX Geogrid’s unique grid structure holds and confines granular particles, effectively interlocking it into place. As the grid strengthens, the granular platform stiffens by keeping aggregate in position. This improves roadway performance and reinforces benefits generated at the onset of traffic loading.

Results

The initial analysis using SpectraPave2 software called for Tensar BX1100 geogrid. This design provided an 80 mm reduction in gravel thickness over the conventional, non-reinforced design. Further analysis demonstrated that applying BX1200 in place of BX1100 would shave an additional 100 mm from the gravel section.

BX1100 bears the same capacity and serviceability as a thicker, unreinforced fill but uses less reinforced aggregate material, saving the Ministry of Transportation 180 mm in aggregate, and $200,000 in material costs.

Gallery

The Nilex Advantage

Nilex is committed to unearthing better results. Whether it’s for a civil, resource or environmental project, we offer the latest engineered and technically superior materials and techniques to save our customers time and money, and minimize the need to move or remove earth, and reduce the need for granular materials.

With over 35 years experience, a long-standing commitment to the environment and highly qualified staff, Nilex delivers the products and technologies that give clients an economic advantage with environmental benefit.

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