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Bayesian Inference of empirical coefficient for Foundation Settlement

Journal of Southwest Jiaotong University(English Edition) 2009年第4期17卷 314-318页

作者：李珍玉王永和杨果林 School of Civil Engineering and Mechanics Central South University of Technology School of Civil Architectural Engineering Central South University

A new approach based on Bayesian theory is proposed to determine the empirical coefficient in soil settlement calculation. Prior distribution is assumed to he uniform in [ 0.2,1.4 ]. Posterior density function is developed in the condition of prior distribution combined with the information of observed samples at four locations on a passenger dedicated fine. The results show that the posterior distribution of the empirical coefficient obeys Gaussian distribution. The mean value of the empirical coefficient decreases gradually with the increasing of the load on ground, and variance variation shows no regularity.

关键词： Bayesian theory empirical coefficient Prior knowledge Posterior distribution

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Study on hydraulic characteristics of sabo dam with a flap structure for debris flow

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International Journal of Sediment Research 2017年第3期32卷 452-464页

作者： Yeonjoong Kim Hajime Nakagawa Kenji Kawaike Hao Zhang Department of Civil and Earth Resources Engineering Disaster Prevention Research InstituteKyoto University Department of Civil and Earth Resources Engineering Director of Ujigawa Hydraulics Laboratory

The front part of the flow is very important and complex in the case of debris flow where there is an accumulation of large boulders. It is important to control or dampen the energy of the frontal part of a debris flow for the safety of the downstream area because the impact pressure of debris flow is much greater than that of clear fluid. The main objective of this study is to analyze the hydraulic characteristics of the proposed dam(i.e. closed-type dam with flap). The vertical pressure distribution of this type is compared with conventional dam types. In the experiments, the total pressure associated with major debris flows was recorded in real time by a system consisting of four dynamic pressure sensors installed on different types of dam. The results from experimental data clearly show that the dam with the flap has advantages of capturing the debris flow with large boulders and controls the total pressure by flow circulation due to presence of the flap structure compared to a closed-type dam without flap. Furthermore, the empirical coefficients of hydrodynamic and solid collision models were proposed and compared with available coefficients.

关键词： Debris flow Flap structure empirical coefficient Total pressure

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