Abstract
Design and analysis of tunnels and underground structures are challenging areas of Geotechnical Engineering. The soil/rock in tunnelling areas is often strengthened by grouting. This improves the properties of soil/rock and enhances the stability. In the present study, a two-dimensional analysis that explains the properties of soil/rock strengthened by grouting is carried out. Initially, the settlement behaviour of grouted soil mass with different curing periods of 7, 14 and 28 days was studied by the plate load laboratory model test, and the settlement behaviour of grouted soil mass was compared with ungrouted soil mass. The experimental results reveal that the settlement of the grouted soil mass is comparatively reduced with respect to increase in curing period. The analysis was carried out using PLAXIS 2D software, a two-dimensional indirect finite element programme which facilitates elastic/elasto-plastic analysis of underground excavations. The distribution of stress and deformation under different loading conditions is visualized from the analysis. Based on the results, critical locations for failure were identified. Then, the grouting was applied to the soil mass. Comparison of the mechanical properties of the grouted and ungrouted soil mass brings out the effectiveness of the grouting in improving the stability of the tunnel.
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Vinothkumar, M., Malathy, R. (2019). Elasto-Plastic Analysis of a Tunnel Strengthened by Grouting. In: Sundaram, R., Shahu, J., Havanagi, V. (eds) Geotechnics for Transportation Infrastructure. Lecture Notes in Civil Engineering , vol 29. Springer, Singapore. https://doi.org/10.1007/978-981-13-6713-7_35
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DOI: https://doi.org/10.1007/978-981-13-6713-7_35
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