Sehneela Sara Aurpa Publishes Two Papers at Geo-Congress 2024

Sehneela Sara Aurpa, PhD published not one, but two papers with ASCE during the 2024 Geo-Congress.

Collectively, her research revolves around the innovative use of Recycled Plastic Pins (RPP) as a sustainable solution to address challenges in geotechnical engineering, notably:

Strengthening the lateral resistance of geotechnical structures, with a special emphasis on MSE walls built on unstable soil.
Improving the bearing capacity of soft foundation soils in various geotechnical applications.

Vertical Load Capacity of Recycled Plastic Pin in Clay Subjected to Field Load Test

ABSTRACT
Construction of geotechnical structures over soft foundation soils is an incredibly challenging task due to the risk of bearing failure and excessive settlement of foundation soil. Recycled plastic pin (RPP) has been used as a noble approach to improve the problematic foundation soil by increasing the bearing capacity of the foundation. The objective of the study was to evaluate the vertical load bearing capacity of individual RPPs by conducting field load tests using plate load tester. In this study, vertical pile load tests were conducted on individual RPPs of two different sizes (10 cm by 10 cm and 15.24 cm by 15.24 cm), and six empirical methods were used to investigate the ultimate load bearing capacity of RPPs. Based on the load settlement behavior obtained by the field load test results, the vertical load bearing capacity of 10 cm RPP ranged from 30 to 45 kN (settlement of 1 to 1.6 cm). On the other hand, 15.24 cm RPP had vertical load bearing capacity of 89 to116 kN with corresponding settlement of 1.2 cm.

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Lateral Load Deflection Behavior of Recycled Plastic Pin Subjected to Field Load Test.

ABSTRACT
Geo-structures, like MSE wall constructed over weak soil, are prone to base sliding failure, which causes failure in the long run. Recycled plastic pins (RPPs) can be a viable and sustainable solution for increasing the lateral resistance of the foundation system. The objective of the present study is to evaluate the lateral resistance of RPPs in terms of load deflection behavior by conducting field load tests. In this study, RPPs of two different sizes were driven into high plastic clay at three different embedment depths and were laterally loaded to failure or until excessive deflection occurred. Based on the load deflection behavior obtained by the field load test results, the 10 cm-by-10 cm RPPs had lateral load bearing capacity ranging from 16 to 28 kN. On the other hand, lateral load bearing capacity of 15.24 cm-by-15.24 cm RPPs was found to be in the range of 29 to 40 kN. It was observed that lateral load capacity increased 40% to 80% as RPP size increased, and deflection increased from 20% to 50% as embedment depth decreased.

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