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A platform for research: civil engineering, architecture and urbanism
Design Method for Slide-Stabilizing Micropile Walls
A design method is presented for slope stabilization involving the use of micropiles extending through the sliding mass into more stable material. This type of wall typically consists of a line of micropiles placed into the soil mass at alternating batter angles. The micropiles are fixed at the ground surface by means of a concrete cap beam running the length of the wall, effectively creating a structural `A-frame' to resist landslide forces. Wall design parameters include size and location of the cap beam, micropile spacing, batter angles, lengths, diameters, and structural design. Current design methods presented in the literature and in the FHWA Reference Manual for Micropiles are reviewed briefly and found to have several shortcomings. In particular, the treatment of individual micropiles as free-standing structural elements subjected to lateral loading at the slide plane and concentrated load at the pile head does not adequately account for the structural interaction that occurs due to the micropiles being connected at the cap beam. In addition, studies of instrumented micropile walls described in the literature indicate that the resistance to sliding contributed by micropiles depends more upon mobilization of axial resistance of the micropiles than it does upon their bending resistance. These observations suggest a simple design method in which the micropile wall is modeled and analyzed as a structural frame, and in which axial force mobilized in the micropiles controls the design of the structure and provides a more realistic representation of wall performance.
Design Method for Slide-Stabilizing Micropile Walls
A design method is presented for slope stabilization involving the use of micropiles extending through the sliding mass into more stable material. This type of wall typically consists of a line of micropiles placed into the soil mass at alternating batter angles. The micropiles are fixed at the ground surface by means of a concrete cap beam running the length of the wall, effectively creating a structural `A-frame' to resist landslide forces. Wall design parameters include size and location of the cap beam, micropile spacing, batter angles, lengths, diameters, and structural design. Current design methods presented in the literature and in the FHWA Reference Manual for Micropiles are reviewed briefly and found to have several shortcomings. In particular, the treatment of individual micropiles as free-standing structural elements subjected to lateral loading at the slide plane and concentrated load at the pile head does not adequately account for the structural interaction that occurs due to the micropiles being connected at the cap beam. In addition, studies of instrumented micropile walls described in the literature indicate that the resistance to sliding contributed by micropiles depends more upon mobilization of axial resistance of the micropiles than it does upon their bending resistance. These observations suggest a simple design method in which the micropile wall is modeled and analyzed as a structural frame, and in which axial force mobilized in the micropiles controls the design of the structure and provides a more realistic representation of wall performance.
Design Method for Slide-Stabilizing Micropile Walls
Turner, John P. (author) / Halvorson, Martin (author)
Geo-Congress 2013 ; 2013 ; San Diego, California, United States
Geo-Congress 2013 ; 1964-1976
2013-02-25
Conference paper
Electronic Resource
English
Design Method for Slide-Stabilizing Micropile Walls
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