Field instrumentation, monitoring of drilled shafts for landslide stabilization and development of pertinent design method.
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Field instrumentation, monitoring of drilled shafts for landslide stabilization and development of pertinent design method.

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  • Creators:
    Liang, Robert Y.
  • Corporate Creators:
    University of Akron. Department of Civil Engineering
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/OH-2010/15
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Ohio
  • Corporate Publisher:
    Ohio. Dept. of Transportation
  • Abstract:
    The design method for using a single row, spaced drilled shafts, socketed into a firm rock strata, to stabilize

    an unstable slope has been developed in this research. The soil arching due to the presence of spaced

    drilled shafts in a slope was observed in 3-dimensioanl finite element simulations and field monitoring data.

    A comprehensive 3-D finite element parametric study was used to derive an empirical equation to quantify

    the arching induced load transfer. A limiting equilibrium based slope stability analysis method, incorporating

    the arching effect, was developed and coded into a PC based program UA SLOPE 2.1, to allow for analysis

    of the factor of safety of the shaft/slope system and the earth thrust on the drilled shaft. The developed

    analysis and design method was validated based on more than 40 cases of 3-dimensional finite element

    simulations, covering a wide range of slope geometry, soil strength parameters, and the drilled shaft

    diameter, spacing, and location conditions. Three slope stabilization projects in Ohio involving the use of

    drilled shafts were monitored with instrumentations to obtain a 3-year performance data of the stabilized

    slope and to validate the design based on the developed method. In addition, a field testing program at the

    ATH-124 Project site was conducted to quantify arching during several stages of surcharge load induced

    slope movements. The developed UA SLOPE 2.1 program was verified by comparisons with the calibrated

    finite element simulation results of this field surcharge loading condition. The UA SLOPE 2.1 program is

    recommended for use in finding an optimized design (i.e., location, diameter, and spacing) of the drilled

    shafts to stabilize an unstable slope.

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