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Implementation of limit states and load resistance design of slopes.

File Language:
English


Details

  • Creators:
    Salgado, Rodrigo ; Woo, Sang Inn ; Tehrani, Faraz S. ; Zhang, Yanbei ; Prezzi, Monica 
  • Corporate Creators:
    Purdue University. Joint Transportation Research Program
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/IN/JTRP-2013/23 
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    United States
  • Corporate Publisher:
    Indiana. Dept. of Transportation
  • Abstract:
    A logical framework is developed for load and resistance factor design (LRFD) of slopes based on reliability analysis. LRFD of slopes with  ; resistance factors developed in this manner ensures that a target probability of slope failure is not exceeded. Three different target  ; probabilities of failure (0.0001, 0.001 and 0.01) are considered in this report. The ultimate limit state for slope stability (formation of a slip  ; surface and considerable movement along this slip surface) is defined using the Bishop simplified method with a factor of safety equal to  ; unity. Gaussian random field theory is used to generate random realizations of a slope with values of strength and unit weight at any  ; given point of the slope that differ from their mean by a random amount. A slope stability analysis is then performed for each slope  ; realization to find the most critical slip surface and the corresponding driving and resisting moments. The probability of slope failure is  ; calculated by counting the number of slope realizations for which the factor of safety did not exceed 1 and dividing that number by the  ; total number of realizations. The mean of the soil parameters is adjusted and this process repeated until the calculated probability of  ; failure reaches to the target probability of failure. Optimal resistance and load factors are obtained by dividing the resisting and driving  ; moments corresponding to the most probable ultimate limit state by the nominal values of resisting and driving moments.   ; The main goal of this study was to provide specific values of resistance and load factors to implement in limit states and load  ; resistance design of slopes in the context of transportation infrastructure. This report discusses the concepts of load and resistance  ; factors, target probability of failure and the ultimate limit state equation in the context of slope stability analysis. It then presents a  ; detailed algorithm for resistance factor calculation by using reliability analysis. Six cases of real slopes designed and constructed by INDOT  ; are examined by using undrained shear strengths in order to illustrate the LRFD procedure and validate the recommended resistance and  ; load factors. 
  • Format:
    PDF
  • Funding:
    SPR-3375
  • Download URL:
    https://rosap.ntl.bts.gov/view/dot/27772/dot_27772_DS1.pdf
  • File Type:
    Filetype[PDF - 1.57 MB]
  • Collection(s):
    US Transportation Collection
  • Main Document Checksum:
    urn:sha256:1387b63a4770ea277e3bc3144838183ee893b9f3c29c2842c9afef0637c089ea
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