Details:

Creators:
Liang, Robert Y. ; Li, Lin
Liang, Robert Y. ; Li, Lin Less -
Corporate Creators:
University of Akron. Dept. of Civil Engineering
Corporate Contributors:
United States. Federal Highway Administration
Subject/TRT Terms:
[+]
Algorithms Computer Programs Monte Carlo Method Probability Slopes Software
Publication/ Report Number:
FHWA/OH-2013/14
Resource Type:
Tech Report
Geographical Coverage:
Ohio
Corporate Publisher:
Ohio. Dept. of Transportation. Office of Statewide Planning and Research
Abstract:
A reliability-based computational algorithm for using a single row and equally spaced drilled shafts to

stabilize an unstable slope has been developed in this research. The Monte-Carlo simulation (MCS)

technique was used in the previously developed deterministic computational program, in which the

limiting equilibrium method of slices was modified to incorporate the arching effects of the drilled shafts

in a slope. Uncertainties of soil parameters in the slope were considered by statistical descriptors,

including mean, coefficient of variance (c.o.v.), and distribution function. Model errors of the semiempirical predictive equation for the load transfer factor for characterizing the soil arching effects were

considered by statistics of bias. A PC-based research grade program, UA Slope 3.0, was coded to allow

for analysis of probability of failure and reliability index of a shaft/slope system. The illustrative example

demonstrated that a single value of factor of safety chosen in the deterministic approach may not yield

the desired level of reliability as uncertainties of soil parameters and model errors cannot be accounted

for systematically. As an extension of this research, importance sampling technique (IST) on drilled

shaft/slope system has been proposed to demonstrate its high efficiency, in which the importance

function and design point are determined for the ordinary method of slices (OMS) with the accompanying

load transfer factor. In addition, the design method of using multiple rows of drilled shaft was developed

to stabilize a large slope, in which the design and optimization criteria were proposed to reach the target

safety and the constructability while meeting the service limit requirement.


Format:
PDF
Funding:
SJN 134710
Collection(s):
US Transportation Collection
Main Document Checksum:
[+]
urn:sha256:2101e6b912733983ef40fc20a1462c3dd106258fd8acb18eafca28b42a3eec7a
Download URL:
https://rosap.ntl.bts.gov/view/dot/26798/dot_26798_DS1.pdf
File Type:

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