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A platform for research: civil engineering, architecture and urbanism
Stabilizing Walls Retained by Nailing under Additional Excavations
To stabilize slopes and support excavations, soil nailing is known for its low cost, high safety, workability and remarkable performance. Combinatorial anchorages are more effective, and where high safety factors are required, prestressed cables are used with concrete blocks, in-situ concrete piles or double steel profile. Researches on parameters affecting safety factor, stress, settlement and displacement many; however, studies on the effects of additional excavation on excavation walls or methods and mechanisms that preserve the additional depth without compromising the whole wall stability are few. This paper investigates the effects of 7m additional excavation on 23m-deep excavation walls of the twin towers project in Shahr-e kord, Iran, retained by soil nailing. To do this, use was made of 2D-FEM and anchorage method with in-situ concrete piles, and the results were validated through comparing the calculated and measured wall displacements. Effects of seven key design factors (pile diameter, horizontal spacing, embedded depth, and 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.
Stabilizing Walls Retained by Nailing under Additional Excavations
To stabilize slopes and support excavations, soil nailing is known for its low cost, high safety, workability and remarkable performance. Combinatorial anchorages are more effective, and where high safety factors are required, prestressed cables are used with concrete blocks, in-situ concrete piles or double steel profile. Researches on parameters affecting safety factor, stress, settlement and displacement many; however, studies on the effects of additional excavation on excavation walls or methods and mechanisms that preserve the additional depth without compromising the whole wall stability are few. This paper investigates the effects of 7m additional excavation on 23m-deep excavation walls of the twin towers project in Shahr-e kord, Iran, retained by soil nailing. To do this, use was made of 2D-FEM and anchorage method with in-situ concrete piles, and the results were validated through comparing the calculated and measured wall displacements. Effects of seven key design factors (pile diameter, horizontal spacing, embedded depth, and 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.
Stabilizing Walls Retained by Nailing under Additional Excavations
Dorobati, Majid Taherzadeh (author) / Hajiannia, Alborz (author) / Kasaeian, Shahrzad (author)
Geo-Chicago 2016 ; 2016 ; Chicago, Illinois
Geo-Chicago 2016 ; 574-583
2016-08-08
Conference paper
Electronic Resource
English
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