scholarly journals Application of Symbolic Regression in Modeling Soil Deformation Modulus

2019 ◽  
Vol 8 (12) ◽  
pp. 4802-4806
Keyword(s):  
Deformation Modulus ◽  
Symbolic Regression ◽  
Engineering Properties ◽  
Soil Deformation ◽  
Test Results ◽  
Pressuremeter Test ◽  
Geotechnical Parameters ◽  
Earth Pressures ◽  
And Behavior

It is not simple to determine in-situ horizontal stresses even though vertical stresses could be determined directly. Pressuremeter is not given high importance even though it is useful in illustrating various geotechnical parameters effectively. It is important to characterize geomaterials which in turn helps us to understand the properties and behavior of the materials. Symbolic Regression model has been prepared to relate pressuremeter test results with geotechnical engineering properties. Understandingthese properties help geotechnical engineers in design and analyses of foundations, earth pressures, etc.

A device for the in situ determination of soil deformation modulus

1995 ◽  
Vol 32 (4) ◽  
pp. 199-204 ◽  
Author(s):  
Ravi Godbole ◽  
Ralph Alcock
Keyword(s):  
Deformation Modulus ◽  
Soil Deformation

scholarly journals The elastic undrained modulus Eu50 for stiff consolidated clays related to the concept of stress history and normalized soil properties

2016 ◽  
Vol 38 (3) ◽  
pp. 67-72 ◽  
Author(s):  
Joanna Stróżyk ◽  
Matylda Tankiewicz
Keyword(s):  
Elastic Modulus ◽  
Soil Properties ◽  
Engineering Properties ◽  
Stress History ◽  
Overburden Pressure ◽  
Geotechnical Parameters ◽  
Confining Pressures ◽  
Isotropic Consolidation ◽  
Different Depths

Abstract The paper presents the results of a triaxial test conducted on stiff, consolidated clays. The standard TXCIU procedure (isotropic consolidation and undrained shearing) was applied in the laboratory soil tests. The undrained elastic modulus Eu50 was determined from each test. The Eu50 values were determined for soil samples cut out from different depths and tested under different confining pressures. There was a significant scatter of values with depth, and no relationships between Eu50 modules or other geotechnical parameters (e.g., cu) were observed. This work presents the concept of normalization of Eu50 modulus values using modified normalization SHANSEP (Stress History And Normalized Soil Engineering Properties). This method was first proposed for estimating the value of the undrained shear strength cu normalizing the parameter relative to the in situ effective vertical stress σ′vo and loading history (overconsolidation stress σ′p and overconsolidation ratio OCR) of the soil. The study demonstrated that the concept of normalization of soil properties can also be used for testing elastic modulus Eu50 of consolidated natural clays and normalized values of geotechnical parameters taking into account the state of stress and load history can be correlated with the value of the overburden pressure.

scholarly journals LOESSES NEAR KRAKÓW IN LIGHT OF GEOLOGICAL-ENGINEERING RESEARCH

2013 ◽  
Vol 35 (1) ◽  
pp. 41-57 ◽  
Author(s):  
Aleksandra Borecka ◽  
Bartłomiej Olek
Keyword(s):  
Laboratory Tests ◽  
Field Tests ◽  
Physical And Mechanical Properties ◽  
Engineering Properties ◽  
Geotechnical Parameters ◽  
Engineering Research ◽  
Loess Area ◽  
Geological Engineering ◽  
Analysis Laboratory

Abstract This work is only a preliminary study on the evaluation of geological engineering properties of loess area of Kraków. It has been expanded to include field tests (CPTU, DMT), which is an alternative to expensive and time-consuming laboratory tests. The field tests allow enough detail to track the variability of physical and mechanical properties of soils, but in many cases, provide too much information, because their interpretation is often based only on a qualitative analysis. Laboratory and field tests are complementary and should be continued in order to determine best the correlation between the measured values of the resistance probes (CPTU, DMT) and the results obtained from laboratory tests. This will provide new calculation formulas for the evaluation of geotechnical parameters of loess in situ.

Analytical Study of a Braced Excavation in Weak Clay

1972 ◽  
Vol 9 (2) ◽  
pp. 145-164 ◽  
Author(s):  
J. H. La Verne Palmer ◽  
T. Cameron Kenney
Keyword(s):  
Parametric Study ◽  
Computer Modelling ◽  
Deformation Modulus ◽  
In Situ Stress ◽  
Soil Conditions ◽  
Sufficient Detail ◽  
Braced Excavations ◽  
Support Conditions ◽  
And Behavior

Analysis of the problem of braced excavations is complicated by the large number of variables involved and by the complex interaction and behavior of the soil and the supporting materials. For this reason a parametric study was made using the finite-element method of analysis to evaluate the influences of the variables. A rather unique computer modelling technique has been used to accommodate both the large number of variables and the problem of interaction and dissimilar behavior. An example of a computer simulation of a well-instrumented braced cut in Norway is given in sufficient detail to illustrate the applicability of the program.For the parametric study a typical excavation with fully penetrating sheet-pile walls was chosen. Of the parameters concerning soil conditions, the soil deformation modulus was found to have the greatest influence. The relative influence of shear strength, of initial in situ stress, of direction of mobilization of shear stress, and of soil-to-pile adhesion is also shown. All of the parameters concerning support conditions are important but pile stiffness and effective strut stiffness are the most important. The influence of prestressing and strut spacing is also shown.

scholarly journals COMPARISON OF THE SOIL DEFORMATION MODULUS VALUES RECEIVED BY THE LABORATORY AND IN SITU TESTS RESULTS

2017 ◽  
Vol 2 (49) ◽  
pp. 144-151
Author(s):  
S. V. Poklonskyi ◽  
M. V. Korniyenko
Keyword(s):  
Deformation Modulus ◽  
Soil Deformation ◽  
In Situ Tests ◽  
Laboratory Methods ◽  
Factors Affecting ◽  
Plate Deformation ◽  
Number Of Factors ◽  
Long Time ◽  
Deformation Test

The soil deformation modulus largely depends on the obtaining method. There are various methods of determining E. In compression soil test a ring of small size is used. It causes a number of factors affecting the test results. The comparison of deformation modulus values obtained by in situ and laboratory methods is shown in article. It was believed for a long time that the oedometer deformation modulus of sands practically does not differ from the plate deformation test modulus, and therefore no transitional coefficients for this soil are given. However, it has been experimentally established that the results of oedometer tests of sands need to be corrected.

scholarly journals Evaluation of sample quality from different sampling methods in Finnish soft sensitive clays

2019 ◽  
Vol 56 (8) ◽  
pp. 1154-1168 ◽  
Author(s):  
Bruno Di Buò ◽  
Juha Selänpää ◽  
Tim Tapani Länsivaara ◽  
Marco D’Ignazio
Keyword(s):  
Storage Time ◽  
Soft Clay ◽  
Test Results ◽  
Geotechnical Parameters ◽  
Sample Quality ◽  
Constant Rate ◽  
And Performance

The determination of reliable geotechnical parameters from laboratory testing is highly dependent on sample quality. Over the past decades, undisturbed sampling of soft sensitive clays has been performed using various apparatuses and procedures. This paper outlines details of the design and performance of a new Laval-type tube sampler employed for the investigation of five soft clay sites located in Finland. The investigation was conducted using the new tube sampler and two different piston samplers. The sample quality was evaluated based on the recompression volume during reconsolidation to the in situ effective stress in constant-rate-of-strain oedometer tests. Test results show that tube samples are generally characterized by higher quality, especially in low-plasticity clays. In particular, the quality of piston samples is highly affected by the apparatus condition and sampling operations. Furthermore, the influence of storage time on tube samples was investigated. To guarantee a proper confinement, and thus reduce swelling, a pressurized system was applied to the tube samples obtained in two soft clay sites. Results demonstrate that the sample quality is not significantly affected by storage time as long as the soil is properly stored in the tube.

scholarly journals Study of mining tailings geotechnical parameters obtained from SCPTu tests carried on dry and saturated layers

2021 ◽  
Vol 337 ◽  
pp. 04010
Author(s):  
Helena P. Nierwinski ◽  
Marcelo Heidemann ◽  
Laura A. Lavalle ◽  
Bruna Sell
Keyword(s):  
Laboratory Tests ◽  
Cone Penetration Test ◽  
Test Results ◽  
Penetration Test ◽  
Soil Behavior ◽  
Cone Penetration ◽  
Geotechnical Parameters ◽  
Saturated Layer ◽  
Laboratory Test Results

The correct interpretation of in situ and laboratory test results is an important step in the design of mining tailing containment structures. This study aims to analyze the Seismic Cone Penetration Test (SCPTu) results obtained into a mining tailing reservoir composed of two material layers: a thick-dry and a tick-saturated. It is possible to observe that in a same tailing reservoir, the CPTu test interpretation can lead to a classification of each layer as a different soil with specific behavior and properties. This condition demonstrates that tailings with intermediate permeability (10-5 m/s < k < 10-8 m/s) may present partial drainage conditions during a standard cone penetration test (CPTu) (v=20 mm/s), if saturated conditions are verified. The effects of partial drainage can affect test results, and can induce to errors in the prediction of soil behavior and geotechnical parameters. To evaluate the possible effects of partial drainage, in situ test results were compared to laboratory tests results. It was possible to verify that estimated behavior of dry layers, obtained from in situ tests results, present more similarity to the results from laboratory tests. Probably, the partial drainage effects verified through the interpretation of dissipation tests, distorted the estimated behavior of the saturated layer material.

The importance of multidisciplinary geoscience investigations for engineering projects in the Oseberg, Brage and Troll Fields

1991 ◽  
Vol 7 (1) ◽  
pp. 195-202 ◽  
Author(s):  
G. Butenko ◽  
S. R. Østmo
Keyword(s):  
Seismic Reflection ◽  
Site Investigation ◽  
Engineering Properties ◽  
Quaternary Sediments ◽  
Geotechnical Parameters ◽  
Soil Layers ◽  
History Of ◽  
Seismic Reflection Profiles ◽  
Engineering Projects

AbstractThe purpose of this paper is to discuss the importance and advantages of coordinating and integrating the different phases and expertise involved in an offshore site investigation. Modern, multi-Channel, high-resolution, seismic reflection profiles improve significantly the ability to predict the continuity of soil layers several kilometres away from the nearest geotechnical boring. The geological history of the sediments is reflected in the geotechnical parameters obtained from in situ and laboratory tests.The Integration of in situ and laboratory soil tests, seismic stratigraphy and geology gives a comprehensive understanding of the Engineering properties of the Quaternary sediments in the Oseberg, Brage and Troll fields.

Sign in / Sign up

Export Citation Format

Share Document