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Influence of Excavation Phase on the Performance of Soil Nail System
Soil nailing is one of the most recommended methods for stabilizing and strengthening the existing steep slopes and excavations, as the construction proceeds from top to bottom. In such a scenario, it is important to decide the depth of excavation at each stage for soil nail installation and to observe the behavior of the system at each phase of excavation. In this paper, efforts have been made to study the mechanism of soil nail system at each phase (during construction) and after the construction. A numerical model was simulated using PLAXIS-2D considering the total depth of excavation ‘H’ and a number of soil nails (grouted) of desired length with a suitable vertical spacing. The nails and facing were modeled as plates. The depth of excavation for each phase was studied under different cases. The changes in axial force, bending moment and shear force of the nails and facing, and change in total horizontal displacement of the soil system were observed. The last nail at each excavation experienced the maximum tensile force and the immediate nail of the next phase experienced a considerable reduction in force. It was also observed that the maximum tensile forces developed in the nails were much lesser compared to those in which excavation depth was bigger and when the nails were installed with smaller depth of excavation in a stage. Horizontal displacement of the soil nail system was comparatively high when depth of excavation in a stage was smaller. It was inferred from the above observations and study that construction phase indeed affects the mechanism of the soil nail system. Stage-wise excavation and construction of the soil nail system with smaller depth of excavation in a stage was most preferred.
Influence of Excavation Phase on the Performance of Soil Nail System
Soil nailing is one of the most recommended methods for stabilizing and strengthening the existing steep slopes and excavations, as the construction proceeds from top to bottom. In such a scenario, it is important to decide the depth of excavation at each stage for soil nail installation and to observe the behavior of the system at each phase of excavation. In this paper, efforts have been made to study the mechanism of soil nail system at each phase (during construction) and after the construction. A numerical model was simulated using PLAXIS-2D considering the total depth of excavation ‘H’ and a number of soil nails (grouted) of desired length with a suitable vertical spacing. The nails and facing were modeled as plates. The depth of excavation for each phase was studied under different cases. The changes in axial force, bending moment and shear force of the nails and facing, and change in total horizontal displacement of the soil system were observed. The last nail at each excavation experienced the maximum tensile force and the immediate nail of the next phase experienced a considerable reduction in force. It was also observed that the maximum tensile forces developed in the nails were much lesser compared to those in which excavation depth was bigger and when the nails were installed with smaller depth of excavation in a stage. Horizontal displacement of the soil nail system was comparatively high when depth of excavation in a stage was smaller. It was inferred from the above observations and study that construction phase indeed affects the mechanism of the soil nail system. Stage-wise excavation and construction of the soil nail system with smaller depth of excavation in a stage was most preferred.
Influence of Excavation Phase on the Performance of Soil Nail System
Lecture Notes in Civil Engineering
Satyanarayana Reddy, C. N. V. (editor) / Saride, Sireesh (editor) / Krishna, A. Murali (editor) / Krupa, H. R. (author) / Prasad, S. K. (author)
2021-07-28
13 pages
Article/Chapter (Book)
Electronic Resource
English
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