International Research Journal of Engineering and Technology (IRJET) Volume: 11 Issue: 05 | May 2024
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e-ISSN:2395-0056 p-ISSN:2395-0072
BEARING CAPACITY IMPROVEMENT OF SAND USING COIR GEOGRID TUBES INFILLED WITH COCONUT SHELL CHIPS Karthika Satheesh G1, Magi N S2 1M. Tech Student, Department of Civil Engineering, Marian Engineering College, Trivandrum, India
2Assistant Professor, Department of Civil Engineering, Marian Engineering College, Trivandrum, India
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resistance, making it suitable for construction materials. However, it lacks economic value, and its disposal process is costly, leading to potential environmental problems. Shear strength characteristics of coir mat in sand was studied by Sridhar et al. [6] in 2014. Direct shear tests were done on coir mat reinforced sand. Size opening of coir mat was varied and it was found that, the maximum value of angle of internal friction was observed corresponding to smaller size of opening. The study also showed that, with increase in size of opening, value of angle of internal friction decreased due to reduction in interlocking effect. Lal et al. [4] in 2017 conducted a study to determine the effect of reinforcement form on behavior of coir geotextile reinforced sand. Coir in the form of geotextile and geocell was used and plate load tests [2] were conducted. Results showed that the use of coir in geocell form enhanced the performance of sand more. For the same amount of reinforcement used, coir geocell offers higher performance characteristics compared to planar forms. Al-Subari et al. [1] in 2020 performed a study to understand the effect of reinforcement of different material on the bearing capacity of sand. It was observed that inclusion of coir showed higher bearing capacity and it also improved friction angle by 2˚ compared to steel and polypropylene reinforcement. In a series of CBR tests, Jelani et al. [3] (2023) looked in the effect of varying percentage of crushed coconut shell in silty sand. According to the study, the soil sample with 10% of crushed coconut shell recorded considerable increase in CBR of 2.3 times compared to unreinforced sample. Comparison study between the bearing capacities of strip footing on soil slope reinforced by planar and tubular form of braid and geogrid elements was conducted by Satvati et al. [5] in the year 2016. From the study, it was observed that the increase in bearing capacity ratio (BCR) of soil slope with braid reinforcement from planar to tubular was 39% and the BCR increase for reinforcement with geogrid from planar to tubular was 53%. The present research focuses on the behavior of soil with and without reinforcement. Coir geogrid was fabricated into tubes, Coir Geogrid Tubes (CGT) and Coconut Shell Chips (CSC) was used as the infill material. Effect of CSC infilled CGT by varying u/B ratios on the bearing capacity of sand is studied in this paper.
Abstract - The growing prevalence of problematic soils
presents significant challenges in construction. Geosynthetics play a pivotal role in improving soil properties, particularly in enhancing the bearing capacity of structures built on sandy terrain. This research looks into the bearing characteristics of sand when reinforced with Geogrid tubes filled with Coconut Shell Chips (CSC). Experimental analyses were conducted to evaluate the enhancement in bearing capacity achieved by sand installed with Coir Geogrid Tubes (CGT) filled with Coconut Shell Chips (CSC). Laboratory plate load tests were carried out to study bearing capacity behavior and settlement reduction in the soil. The study investigates how varying the vertical distance between the surface and the first layer of geosynthetic of geogrid tubes, impacts sand behavior through experimentation. It examines the bearing capacity effect of CSC-filled CGT with diameter 2cm at different u/B ratios of 0.5, 0.75 and 1, where B is the footing width. The potential of using coir geogrid in reinforcement form is studied. Key Words: Bearing capacity, Plate load test, Coir, Geogrid tubes, Coconut shell chips. 1. INTRODUCTION Civil engineers face daunting tasks when constructing over weak soils, as these soils are prone to problems like differential settlements, low shear strengths, and high compressibility. Coir, a 100% organic fiber derived naturally from coconut husks, is a renewable resource sourced from the coconut tree. When employed in grids or mats, various factors such as the grid's aperture size, the thickness and shape of rib cross-sections, as well as the strength of knots, become significant. Numerous studies have explored the modification and enhancement of soil reinforcement properties and their shapes. The form of reinforcement plays a crucial role in design, as the same quantity of reinforcement can yield different beneficial effects. Geosynthetics can be transformed into tubular elements for reinforcement purposes. Crushed coconut shells are well-suited as soil stabilizers due to their durability, high toughness, and abrasion resistance. This suitability arises from the coconut shell's excellent weather
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