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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    • 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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