scholarly journals BAYANAL code in geotechnical design based on Eurocode 7

2013 ◽  
Vol 45 (1) ◽  
pp. 17-26
Author(s):  
Simon Rabarijoely ◽  
Stanisław Jabłonowski ◽  
Kazimierz Garbulewski
Keyword(s):  
Numerical Code ◽  
Characteristic Parameters ◽  
Geotechnical Parameters ◽  
Promising Tool ◽  
Eurocode 7 ◽  
Geotechnical Design ◽  
Characteristic Values ◽  
High Degree ◽  
Geotechnical Characteristic

Abstract BAYANAL code in geotechnical design based on Eurocode 7. Geotechnical problems that are characterized by a high degree of complexity and uncertainty with respect to the input data are solved recently, using the Bayesian analysis (for instance the problem of a cautious estimation of the geotechnical characteristic parameters according to the Eurocode 7 requirements). The applicability of the Bayesian approach to geotechnics via a simple examples related to determination of characteristic values of geotechnical parameters for design structures is in the paper addressed. In order to select the characteristic parameters for the geotechnical design a new numerical code called BAYANAL was developed. Example of applying the BAYANAL code to analyse the DMT tests demonstrates that it is a powerful and promising tool in evaluation of ground properties and geotechnical parameters.

scholarly journals STABILIZATION AND SPECIFICATION OF CHARACTERISTIC VALUE OF GEOTECHNICAL PARAMETERS

2017 ◽  
Vol 10 ◽  
pp. 61
Author(s):  
Ivan Vaníček
Keyword(s):  
Laboratory Tests ◽  
Soil Stabilization ◽  
Logical Scheme ◽  
Geotechnical Parameters ◽  
Geotechnical Data ◽  
Earth Structures ◽  
Geotechnical Design ◽  
Characteristic Values ◽  
Different Soils

Soil stabilization, process, by which the soil properties are improved, is getting growing attention during last periods. Paper is focused on application for earth structures. Methods of soil stabilization together with their applicability for different soils are discussed firstly. The sensitivity of the process of the cautious estimation of the characteristic values of geotechnical parameters which are subsequently used for the design, is shown on the base of the logical scheme of the geotechnical design report for earth structures. Finally the need of the laboratory tests for the closer specification of the soil stabilization technology and also for the determination of the geotechnical data are discussed.

scholarly journals A Bayesian Approach in the Evaluation of Unit Weight of Mineral and Organic Soils Based on Dilatometer Tests (DMT)

2019 ◽  
Vol 9 (18) ◽  
pp. 3779
Author(s):  
Rabarijoely
Keyword(s):  
Bayesian Approach ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Field Research ◽  
Unit Weight ◽  
Organic Soils ◽  
Geotechnical Parameters ◽  
Statistical Measures ◽  
Characteristic Values ◽  
High Degree

Recently, geotechnical problems that are characterized by a high degree of complexity and uncertainty with respect to input data have been solved using Bayesian analysis. One example is the problem of cautious estimation of geotechnical parameters according to Eurocode 7 requirements. The research included various types of soil such as peat, gyttja, organic mud, and clays. These were studied in order to develop an empirical correlation for determining the unit weight of mineral and organic soils. The compiled database of documented field research sites for different types of soil was used to investigate and develop direct relationships between measured results and dilatometer (DMT) readings, i.e., po and p1 together with pore water pressure (uo) and pressure (Pa). The soil unit weights were determined for both mineral and organic soils. The paper addresses the applicability of the Bayesian approach in geotechnics via a simple example related to the determination of characteristic values of geotechnical parameters for design structures. The results show that it is possible to conduct a more reliable forecast with improved statistical measures compared to other available methods for multilayer subsoils.

Statistical determination of multivariate characteristic values for Eurocode 7

2020 ◽  
Vol 82 ◽  
pp. 101893 ◽  
Author(s):  
Jianye Ching ◽  
Kok-Kwang Phoon ◽  
Kai-Fu Chen ◽  
Trevor L.L. Orr ◽  
Hans R. Schneider
Keyword(s):  
Eurocode 7 ◽  
Statistical Determination ◽  
Characteristic Values

scholarly journals Evaluation of the mechanical properties of fluvial coarsegrained soils from dynamic penetration test

2021 ◽  
Vol 1209 (1) ◽  
pp. 012081
Author(s):  
E Kučová ◽  
M Kuvik
Keyword(s):  
Coarse Grained ◽  
Rock Properties ◽  
Penetration Test ◽  
Large Space ◽  
Geotechnical Parameters ◽  
Geotechnical Structures ◽  
Dynamic Penetration ◽  
Statistical Determination ◽  
Characteristic Values

Abstract Soil and rock properties are essential inputs for the design of geotechnical structures. But unlike man-made materials, the determination of the characteristic value is not simple, mostly because of the large space variability of the soils and rocks. In many cases, the large spatial variability makes it difficult to collect sufficient ground samples for further laboratory testing so that many tests are performed directly in the field. In Slovakia, the dynamic penetration test (DP) is, among others, a quite popular field test for soil investigation. From the measured data, it is possible to derive relative density (ID) shear (φ ef) and deformation (E def) parameters of coarse-grained soils. There are many available correlations between the DP results and geotechnical parameters. Therefore, it is necessary to choose the most appropriate one as it considerably affects the final evaluation. This paper shows the assessment of geotechnical parameters of coarse-grained fluvial soil from the DP results and presents the statistical determination of its characteristic values, which are furthermore compared with the nominal values used in Slovakia.

Fuzzy-based approach for determination of characteristic values of measured geotechnical parameters

2000 ◽  
Vol 37 (5) ◽  
pp. 1131-1140 ◽  
Author(s):  
N O Nawari ◽  
R Liang
Keyword(s):  
Fuzzy Variable ◽  
Fuzzy Model ◽  
Mean Value ◽  
Geotechnical Properties ◽  
Distribution Functions ◽  
Safety Level ◽  
Geotechnical Parameters ◽  
Fuzzy Variables ◽  
Characteristic Values

Determination of the nominal (characteristic) values of geotechnical properties plays a crucial role within the limits states design (LSD or LRFD) concepts. The interrelationship between the process of the selection of the nominal value and the safety level is not clearly addressed in most of the new limits states design codes of practice for geotechnical engineering. Estimation of the characteristic values (p% fractile or the mean value) using the stochastic models is often linked up with some assumptions regarding the probability distribution functions. Probability theory has been perceived as a unique methodology to handle uncertainty in these geotechnical parameters despite the fact that some of the uncertainties associated with these geotechnical properties may be nonstochastic in nature. In this paper, the uncertainty connected with measured geotechnical properties is modeled using the fuzzy-reliability techniques. The measured parameters are rendered into fuzzy variables and the nominal values are characterized by fuzziness. The procedure presented is proposed as an alternative or complementary method to the estimate of the nominal values of geomaterials. The approach is illustrated with computational algorithms and a numerical example.Key words: characteristic value, nominal value, fuzzy model, fuzzy variable, resistance factor, probability.

Feasibility of Molecular Structure Determination With a High Resolution Electron Microscope

1968 ◽  
Vol 26 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Electron Microscope ◽  
Substrate Surface ◽  
Helical Axis ◽  
Base Plane ◽  
Resolution Electron ◽  
High Resolution Electron Microscope ◽  
High Degree ◽  
Degree Of Order ◽  
Purine Pyrimidine

An ultimate design goal for an improved electron microscope, aimed at biological applications, is the determination of the structure of complex bio-molecules. As a prototype of this class of problems, we propose to examine the possibility of reading DNA sequence by an imaginable instrument design. This problem ideally combines absolute importance and relative simplicity, in as much as the problem of enzyme structure seems to be a much more difficult one.The proposed technique involves the deposition on a thin graphite lamina of intact double helical DNA rods. If the structure can be maintained under vacuum conditions, we can then make use of the high degree of order to greatly reduce the work involved in discriminating between the four possible purine-pyrimidine arrangements in each base plane. The phosphorus atoms of the back bone form in projection (the helical axis being necessarily parallel to the substrate surface) two intertwined sinusoids. If these phosphorus atoms have been located up to a certain point on the molecule, we have available excellent information on the orientation of the base plane at that point, and can then locate in projection the key atoms for discrimination of the four alternatives.

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