Impact of Geogrid Layers on Soil-Pipe Interaction: Bearing Capacity, Settlement, and Stress

What is it about?

This study explores the influence of single and multiple layers of geogrids on bearing capacity and stress behavior through laboratory experiments. It evaluates parameters such as the depth of the first geogrid, vertical spacing between geogrid layers, and the number of geogrid layers on bearing capacity, settlement behavior, and stress distribution using strain gauges. The results are presented in terms of bearing capacity ratio (BCR), settlement reduction factor (SRF), and stress capacity ratio (SCR). Key findings indicate that the optimal depth for the first geogrid is at half the strip footing width (u=0.50B), enhancing bearing capacity by 1.50 times and reducing settlement by 41%. Additionally, the vertical spacing and number of geogrid layers significantly affect performance, with optimal spacing at h=0.50B and no significant improvement beyond two layers of geogrid. The study underscores the importance of proper geogrid placement and configuration for maximizing soil reinforcement benefits.

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Photo by Luca Onniboni on Unsplash

Photo by Luca Onniboni on Unsplash

Why is it important?

This research is crucial as it explores the enhancement of soil bearing capacity and stress behavior using geogrids, which are vital for the stability and durability of civil engineering structures such as buildings, roads, and pipelines. Understanding the optimal configuration of geogrids can lead to more effective and efficient soil reinforcement strategies, reducing settlement and stress on buried structures, thus ensuring longevity and safety. Key Takeaways: • The optimum depth for the first geogrid layer is half the strip footing width (u = 0.50B), which increases bearing capacity by 1.50 times and reduces settlement by 41% and pipe stress by 24% compared to unreinforced soil. • The vertical spacing between geogrid layers significantly impacts bearing capacity, with the maximum benefit observed at a spacing of h = 0.50B. The upper geogrid layer experiences notably higher stress than the lower layer, indicating a critical role in soil reinforcement. • Using more than two geogrid layers does not significantly improve bearing capacity or stress distribution, suggesting that the optimal number of geogrid layers for effective soil reinforcement is two.