Uncertainty analysis on remoulded undrained shear strength of marine clay
Remoulded undrained shear strength su-r is a soil property associated with disturbed soil. This parameter is used to indicate the evolution of the post-failure behaviour of seafloor soil, estimate the rheological properties of debris flows and the drag forces on seafloor structures exerted by a submarine slide, and calculate the penetration resistance of skirt walls. This work discusses the influence of uncertainty on the estimate of empirical relationships between su-r and liquidity index IL as a potential predictor of the remoulded soil strength. Special emphasis is made on assessing the uncertainty inherent to su-r, when the definition of the empirical models is updated from a global to a regional data set. For this purpose two approaches are followed: a parameterisation in the ‘log space (log-Linear Model, LLM) by transforming least square exponential fitting to log-linear expression, and a parameterisation in the ‘physical space using Bayesian Non-Linear Regression (BNLR). The updating of the trend models conditioned on the two available data sets is performed using simple Bayesian principles. Results show contrasting trends obtained by the two approaches. A thorough discussion is included based on the different hypothesis considered for the estimate of each model.
S.L.Yang, Z.Medina-Cetina, F.Nadim Z.Medina-Cetina F.Nadim
International Centre for Geohazards, Norwegian Geotechnical Institute, Oslo, Norway
国际会议
上海
英文
2007-10-18（万方平台首次上网日期，不代表论文的发表时间）