Details:

Creators:
Liang, Robert Y.
Corporate Creators:
University of Akron. Department of Civil Engineering
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Landslides Landslides--Ohio--Prevention Rock Drilling Shafts (Excavations) Slopes (Soil Mechanics)--Ohio--Stability Slope Stability
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.


Format:
PDF
Funding:
134238
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:86ca58aa88a3493e9065bc162cb167da3f118898acfd7ac32b78bd003402ae3f
Download URL:
https://rosap.ntl.bts.gov/view/dot/20531/dot_20531_DS1.pdf
File Type:

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