Provide a cost-effective solution to stabilize soft soils below a highway lane widening area.
The widening of State highway 105 at the FM1774 crossing in Plantersville, TX presented construction and long-term performance challenges. The project consisted of widening the east-west, one-by-one lane, to a two-by-two lane roadway. During the earthwork cuts into the natural hillside, several springs were encountered in the westbound portion of the project which made working the already less than idea subgrade conditions more challenging, by increasing the moisture content to a near saturated state.
This portion of the highway, was historically known to have significant longitudinal cracking, interfering with both driver comfort and cutting into the DOTs repair and maintenance budget. The cracking was likely caused by construction of the roadway over moisture sensitive soils (expansive clays) and the presence of fluctuating groundwater levels and capillary action.
The original project pavement design consisted of cement stabilized subgrade to treat the existing subgrade with CBR=1.5%. In addition, the section included 7 inches of flexbase and 8 inches of asphalt. The project team wanted to consider alternate stabilization for the project since the constructability of the cement stabilized base during saturated conditions would be problematic.
The project team was able to eliminate the need to cement stabilize the subgrade and installed a geosynthetic reinforced pavement with Mirafi H2Ri, a high strength, moisture-management geotextile, without adding any additional thickness to the original section which included 7” of flex base and 8” of asphalt. The DOT had used Mirafi H2Ri in the past on a test installation and was able to implement the same solution for this project using the H2Ri to provide both mechanical and hydraulic stabilization.
Moisture Management / Enhanced Lateral Drainage
Wicking nylons are incorporated into the geotextile during the manufacturing process, which adds the unique ability to laterally remove water from both saturated and unsaturated subgrades.
To maintain integrity of the existing soils and the crushed aggregate fill which will be used above the geosynthetic to prevent migration of fines from the subgrade soils into the fill section. A small percent migration of fines can have an enormous negative impact on overall strength.
To allow movement of water through the geosynthetic while retaining soil on upstream side. The unique double layer construction provides a wide range of pore sizes for an excellent separation factor, superior filtration, and flow characteristics of a fine to coarse sand layer.
To prevent lateral movement (spread) of the aggregate fill. RSi-Series has excellent soil and base course confine- ment resulting in greater load distribution.
To include a tensile element to improve bearing capacity of the section. RSi-Series has higher tensile modulus properties than the leading stabilization products.
Robust damage resistance for moderate to severe stress installations. The stabilized section using Mirafi H2Ri passed the 95% compaction requirement in all areas.
As an engineer or contractor, completing your sitework projects on time and with budget is critical for maintaining a positive reputation and securing future business.
Unfortunately, too often due to soft soils, you are forced to extend your projects timeline or worse increase your budget. Putting you and your team at risk for penalties or fees, and leaving you feeling stressed over the success of your project.
You deserve a team of registered professionals, industry-leading innovators, and access to proven solutions to provide you and your clients the clarity and confidence you deserve.
Stop stressing over completing your projects on time and within budget. Instead, cut costs, save time, increase performance and capitalize on a full-service solution from your project's start to finish.
Don’t let soft soils slow down your sitework projects any longer. Take control and Submit a Free Project Evaluation now to identify how using Tensar InterAx geogrid can help you reduce cost, install time and improve your design’s life and performance for your subgrade stabilization, pavement, and working platforms project. Submit a Free Project Evaluation now.
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