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Effects of additional excavation on critical slip surface of stabilized walls with soil nailing

By A. Hajiannia, M. T. Dorobati, S. B. Baghbadorani and S. Kasaeian


In recent years, soil nailing has been increasingly used, due to its low cost, high safety, workability and remarkable performance, to stabilize slopes and support excavations. Much research has been done on parameters affecting safety factor, stress, settlement and displacement. However, studies on the effects of additional excavation on excavation walls or, in other words, methods and mechanisms to preserve additional depth without compromising the whole wall stability while maintaining and controlling the initial slip surface are not many. Therefore, this paper aims at investigating the effects of 7m additional excavation on the 23m-deep excavation walls (totally 30 m) of the Twin Towers project in Shahr-e kord, Iran, retained by soil nailing systems. To retain the additional depth, use has been made of the 2D-FEM and anchorage method with in-situ concrete piles, and the results have been validated through a comparison between the calculated and measured wall displacements. The effects of seven key design factors (pile diameter, horizontal spacing, embedded length, anchor angle, prestressing force, bonded/unbonded length of the piles or anchors) have been discussed based on the results of FEM which is quite an efficient method for settlement predictions. Finally, a number of design charts have been prepared for in-situ concrete pile anchorage used in additional excavations

Topics: 1111 Soil Science, 1908 Geophysics, 1909 Geotechnical Engineering and Engineering Geology
Publisher: Australian Geomechanics Society
Year: 2016
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