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Finite Difference Model of Subgrade Reinforcement Using Geosynthetics
Several civil, geotechnical, and geoenvironmental applications have benefited from the inclusion of geosynthetic reinforcement to control subgrade deformation and differential settlement. The inclusion of this reinforcement can greatly enhance the durability and longevity of constructed facilities. However, engineers' ability to quantify effect of reinforcement on deformation under load is limited due to the complicated nature of the geosynthetic-soil interaction mechanism. This paper presents a finite-difference-based analysis method to model the effects of geosynthetic subgrade reinforcement on cross-plane deformation. This method was developed specifically for use in performance assessments of landfill final covers, where larger areas need to be modeled with computationally-efficient algorithms. Accordingly, the methods presented in this paper could be integrated into design analyses of large areas. The method draws from previous analytical studies as well as experimental models of landfill covers, road subgrade and sinkhole bridging reinforcement. Example results are presented to show how the method can be implemented for a representative design scenario. In the present study, a simplified model has been proposed to predict the behavior of geosynthetically-reinforced soil resting on top of subgrade susceptible to depressions or cavities. The solution of the governing differential equation of the TSS model was set up using spreadsheets in Microsoft Excel 2010. The FD methodology was successfully employed to analyze example problems from published case histories and compare the proposed model against experimental results. In general, the TSS model results show good agreement with published experimental results, exhibiting minimal bias and less error than in predictions of subgrade compressibility. Therefore, the TSS model can be used to analyze the settlement profile of cross-sections of geosynthetically-reinforced soil, especially shallow fill applications such as landfill final covers. An example problem was also presented to demonstrate how the TSS model can be used for the design of geosynthetically-reinforced soil.
Finite Difference Model of Subgrade Reinforcement Using Geosynthetics
Several civil, geotechnical, and geoenvironmental applications have benefited from the inclusion of geosynthetic reinforcement to control subgrade deformation and differential settlement. The inclusion of this reinforcement can greatly enhance the durability and longevity of constructed facilities. However, engineers' ability to quantify effect of reinforcement on deformation under load is limited due to the complicated nature of the geosynthetic-soil interaction mechanism. This paper presents a finite-difference-based analysis method to model the effects of geosynthetic subgrade reinforcement on cross-plane deformation. This method was developed specifically for use in performance assessments of landfill final covers, where larger areas need to be modeled with computationally-efficient algorithms. Accordingly, the methods presented in this paper could be integrated into design analyses of large areas. The method draws from previous analytical studies as well as experimental models of landfill covers, road subgrade and sinkhole bridging reinforcement. Example results are presented to show how the method can be implemented for a representative design scenario. In the present study, a simplified model has been proposed to predict the behavior of geosynthetically-reinforced soil resting on top of subgrade susceptible to depressions or cavities. The solution of the governing differential equation of the TSS model was set up using spreadsheets in Microsoft Excel 2010. The FD methodology was successfully employed to analyze example problems from published case histories and compare the proposed model against experimental results. In general, the TSS model results show good agreement with published experimental results, exhibiting minimal bias and less error than in predictions of subgrade compressibility. Therefore, the TSS model can be used to analyze the settlement profile of cross-sections of geosynthetically-reinforced soil, especially shallow fill applications such as landfill final covers. An example problem was also presented to demonstrate how the TSS model can be used for the design of geosynthetically-reinforced soil.
Finite Difference Model of Subgrade Reinforcement Using Geosynthetics
Ramya, Rajan (author) / Foye, Kevin C. (author) / Kabalan, Mohammad (author) / Song, Te-Yang (author)
Geosynthetics, Geosynthetics Conference, 2015 ; 1009-1018
2015
10 Seiten, Bilder, Tabellen, Quellen
Conference paper
Storage medium
English
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