Strata Geosystems (India) Pvt. Ltd. is one of the market leader in the geosynthetic segment for soil reinforcement solutions in India and across the globe. It was established in 2004, in partnership with Strata Systems Inc., USA – a two-decade veteran in geosynthetics.
Strata provide end-to-end solutions for soil reinforcement challenges including supply, design, and construction with our world-renowned StrataGrid™ (geogrid) and StrataWeb® (geocells). Their vision is to continue leading the industry with superior quality products and technically creative solutions that are cost-effective, time-saving, a and long-lasting.
The group’s manufacturing plants are ISO certified and our products have the CE mark. In addition, all testing is conducted in GAI-LAP accredited labs across the U.S., U.K., and India. We are also a proud member of the International Geotechnical Society (IGS) promoting advancements in geosynthetics.
Their continued growth is based on long-held values of innovation, integrity, super quality, and commitment to the environment.
Discussed below is a project in focus.
Case In Focus: Construction of container storage yard with StrataWeb® geocells at Kolkata port
In any project, constructing on weak subgrade is always a challenge. In this case, our client, ALLCARGO LOGISTICS Ltd., was confronted with a similar problem at their proposed container terminal in Kolkata (a major city in India). The container yard, located at Kidderpore Dock is used for transit storage of heavy containers which would be stacked five-high. The subsoil in this area includes 7-8 metres of riverine deposits comprising of soft clay topped by about 3m of heterogeneous fill.
Container yards typically have two major issues, which have an impact on construction and maintenance:
- Heavy pressures from container stacks
- Non-uniform settlements of the ground
- The Conventional Approach
By the conventional method, the subsoil is consolidated by installing prefabricated vertical drains (PVDs) and preloaded by placing surcharge. This is a slow process that requires close monitoring of settlements as the surcharge is placed in stages. Surcharging usually involves large quantity of earthwork to progressively achieve the final load, often equivalent to the load to be transferred from the loading system.
However, container stack loads are quite heavy, requiring heavy surcharge. Besides, time to retain each surcharging stage to develop adequate bearing capacity for the next stage needs to be carefully determined by monitoring settlement trends during each loading stage. The cost of earthworks to achieve the final loading and its redundancy after surcharging can be overwhelming.
Strata’s Innovative Approach
Strata geotechnical specialists designed an innovative solution that is cost-effective, technically-sound, and long-lasting.
The Strata solution eliminates the concrete layer altogether. The system incorporates StrataWeb® within the paving to reduce the bearing pressures onto the subsoil. This provides a leaner pavement design. StrataWeb® along with infilling also addresses the differential settlement issues, providing an even working ground.
The analysis demonstrated that imposed pressures with a section reinforced with StrataWeb® SW 356-150 (Weld spacing 356 mm; cell depth 150mm) are well within the safe bearing capacity of the subgrade. The design included two layers of StrataWeb® to bear the load spread. The StrataWeb® was infilled and topped with 10mm of down-graded gravel. StrataBase was included to further strengthen the section and improve the performance.
Strata’s value addition
- Saved up to 15% of the cost compared to conventional methods
- Rapid installation due to ease of StrataWeb® transportation and use of locally available and cheaper material
- Increased life span with lower maintenance
- Load spread ensured that bearing pressures were within safe limits
- Uniform settlements and even working ground
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