scholarly journals An improved method of Newmark analysis for mapping hazards of coseismic landslides

2019 ◽  
Author(s):  
Mingdong Zang ◽  
Shengwen Qi ◽  
Zhuping Sheng ◽  
Blanca S. Zamora ◽  
Yu Zou
Keyword(s):  
Permanent Deformation ◽  
Regional Analysis ◽  
Deformation Analysis ◽  
Data Sets ◽  
Infrastructure Development ◽  
Permanent Displacement ◽  
Ground Shaking ◽  
Coseismic Landslides ◽  
Stability Of Slopes ◽  
Inexact Reasoning

Abstract. Coseismic landslides have been responsible for destroyed buildings and structures, dislocated roads and bridges, cut off of pipelines and lifelines, and tens of thousands of deaths. Newmark's method is widely applied to assess the permanent displacement along a potential slide surface to determine the coseismic responses of the slope. The Mw 6.1 (USGS) earthquake in Ludian, Yunnan Province, China in 2014 has caused widespread landslides and provided the ideal data sets to conduct a regional analysis of coseismic stability of slopes. The data sets include the topography, shear strength, and ground shaking of the study area. All of these data sets are digitized and rasterized at 30 m grid spacing using ArcGIS and combined in a dynamic slope model based on Newmark permanent-deformation analysis. The application of Barton model was then applied in the permanent-deformation analysis. According to a method of inexact reasoning, comparisons are made between the predicted displacements and a comprehensive inventory of landslides triggered by the Ludian earthquake to map the spatial variability in certainty factors. A coseismic landslide hazard map is then produced based on the spatial distribution of the values of certainty factors. Such map can be applied to predict the hazard zone of the region and provide guidelines for making decisions regarding infrastructure development and post-earthquake reconstruction.

scholarly journals An improved method of Newmark analysis for mapping hazards of coseismic landslides

2019 ◽  
Author(s):  
Mingdong Zang ◽  
Shengwen Qi ◽  
Yu Zou ◽  
Zhuping Sheng ◽  
Blanca S. Zamora
Keyword(s):  
Factor Model ◽  
Area Under The Curve ◽  
Infrastructure Development ◽  
Improved Method ◽  
Permanent Displacement ◽  
Coseismic Landslides ◽  
Ludian Earthquake ◽  
Slide Surface ◽  
Improved Performance ◽  
Using Data

Abstract. Coseismic landslides have been responsible for destroyed buildings and structures, dislocated roads and bridges, cut off of pipelines and lifelines, and tens of thousands of deaths. Accurately mapping the hazards of coseismic landslides is an important and challenge work. Newmark's method is widely applied to assess the permanent displacement along a potential slide surface to determine the coseismic responses of the slope. This paper considers the roughness and size effect of the potential slide surface-unloading joint, and then presents an improved method of Newmark analysis for mapping hazard of coseismic landslides. The improved method is verified using data from a case study of the 2014 Mw 6.1 (USGS) Ludian earthquake in Yunnan Province, China. The permanent displacement yielded from this method range from 0 to 122 cm. Comparisons are made between the predicted displacements and a comprehensive inventory of landslides triggered by the Ludian earthquake to map the spatial variability using certainty factor model (CFM). Confidence levels of coseismic landslides indicated by certainty factors range from −1 to 0.95. A coseismic landslide hazard map is then produced based on the spatial distribution of the values of certainty factors. Area under the curve analysis is used to draw a comparison between the improved and conventional method of Newmark analysis, revealing the improved performance of the method presented in this paper. Such method can be applied to predict the hazard zone of the region and provide guidelines for making decisions regarding infrastructure development and post-earthquake reconstruction.

Permanent deformation analysis of asphalt mixtures using soft computing techniques

2011 ◽  
Vol 38 (5) ◽  
pp. 6081-6100 ◽  
Author(s):  
Mohammad Reza Mirzahosseini ◽  
Alireza Aghaeifar ◽  
Amir Hossein Alavi ◽  
Amir Hossein Gandomi ◽  
Reza Seyednour
Keyword(s):  
Soft Computing ◽  
Permanent Deformation ◽  
Asphalt Mixtures ◽  
Deformation Analysis ◽  
Soft Computing Techniques

scholarly journals Use of mechanistic-empirical method of pavement design for performance sensitivity analysis to asphalt pavement fatigue

2021 ◽  
Vol 26 (3) ◽  
Author(s):  
Natalia Assunção Brasil Silva ◽  
Taciano Oliveira da Silva ◽  
Heraldo Nunes Pitanga ◽  
Geraldo Luciano de Oliveira Marques
Keyword(s):  
Design Method ◽  
Permanent Deformation ◽  
Empirical Method ◽  
Material Behavior ◽  
Experimental Program ◽  
Data Sets ◽  
Statistical Regression ◽  
Wide Range ◽  
Number Of Cycles

ABSTRACT In the new Brazilian mechanistic-empirical design method of asphalt pavements, MeDiNa, the characterization of permanent deformation (PD) for the selection of soils and gravel is based on tests performed with at least 150,000 loading cycles for each of the nine specimens indicated in the DNIT standard. Despite providing information about the material behavior under a wide range of testing conditions, the experimental program related to these PD characterizations is time consuming and it is believed that it can be optimized. This paper evaluates the influence of the number of loading cycle applications on the characterization of the materials. For this purpose, seven materials were analyzed at their optimum moisture content (OMC) and one of them was also compacted in a condition above the OMC, in a total of eight data sets. Statistical regression analyzes were performed to identify the parameters of the predictive model for different numbers of cycles and the PD predictions for the different materials were compared. From these results, simulations were performed in the MeDiNa software to predict the performance of the materials. Four different N values were evaluated, considering 150,000 cycles as reference: discarding the 500 first cycles, but considering the PD accumulated in that interval; discarding the 500 first cycles and considering the PD accumulated in that interval; final N of 80,000; and final N of 100,000. For the analyzed materials, no significant differences were observed in the PD prediction, even considering tests with 50,000 or 70,000 cycles less than the 150,000 cycles required in the standard. This indicates that, although characterization is recommended following standardized procedures, the experimental program of the current PD standard can possibly be significantly optimized by reducing the number of cycles applied to materials in laboratory tests. This possibility must be analyzed for each material.

Determination of Elastic and Plastic Subgrade Soil Parameters for Asphalt Cracking and Rutting Prediction

1996 ◽  
Vol 1540 (1) ◽  
pp. 97-104 ◽  
Author(s):  
G. Behzadi ◽  
W. O. Yandell
Keyword(s):  
Moisture Content ◽  
Constitutive Model ◽  
Permanent Deformation ◽  
Triaxial Tests ◽  
Deformation Analysis ◽  
Soil Parameters ◽  
Dry Density ◽  
Silty Clay ◽  
Exponential Relationship ◽  
Deviator Stress

A preliminary step in the prediction of rutting and cracking in a number of accelerated loading facility trials in Australia is presented. The results of laboratory repeated load triaxial tests were used to characterize the residual and resilient deformation of a silty clay subgrade material. The analysis of permanent deformation indicated that the well-known model ∈p = INS can be used to estimate the accumulated strain at any number of loading cycles. The parameter S (the slope of the line in a plot of log ∈p –log N) was found to be independent of stress and density, but very small increases were observed as moisture content increased. The parameter I (the intercept in a plot of log ∈p –log N) was found to be most sensitive to deviator stress. The test results also indicated that I increased with increasing moisture content and decreased as dry density increased. The analysis revealed that an exponential relationship existed between I and deviator stress. This relationship was used to develop a constitutive model for silty clay based on the previously mentioned well-known model. The constitutive model obtained would be able to predict the plastic strain under any number of loads at any specified stress level. Resilient deformation analysis has shown that resilient modulus initially decreased rapidly with increasing deviator stress and then increased slightly or was nearly constant. The elastic and plastic parameters will be used as input for performance predictors such as VESYS and Mechano-Lattice.

scholarly journals STUDY ON PERMANENT DEFORMATION ANALYSIS OF BASE COURSE SURFACE UNDER CONCRERTE PAVEMENT

2001 ◽  
Vol 6 ◽  
pp. 155-166
Author(s):  
Yasushi TAKEUCHI ◽  
Masashi KOYANAGAWA ◽  
Tatsuo NISHIZAWA ◽  
Katsura ENDO ◽  
Kazuyuki KUBO
Keyword(s):  
Permanent Deformation ◽  
Deformation Analysis ◽  
Base Course

The Foundation Liquefaction and Permanent Deformation Analysis of Diversion Dike for Nuclear Power Plant

2011 ◽  
Vol 90-93 ◽  
pp. 1865-1869 ◽  
Author(s):  
Jie Zhao ◽  
Yang Zheng ◽  
Gui Xuan Wang
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Dynamic Analysis ◽  
Effective Stress ◽  
Nuclear Power ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Permanent Deformation ◽  
Deformation Analysis ◽  
Response Analysis

In seismic response analysis, total stress method is adopted mostly, but variation of the pore water pressure and the development process of the liquefaction are not considered in this method. Based on the dynamic analysis of two-dimensional effective stress proposed by Zhu-jiang Shen, combined with dynamic consolidation theory of Biot, the foundation liquefaction analysis of the diversion dike for nuclear power plant is performed by using effective stress dynamic analysis program, the liquefied range is given, as well as the permanent deformation. The obtained law can provide theoretical guidance for the similar project.

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