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.

Traction-Soil Compaction Tradeoffs as a Function of Dynamic Soil-Tire Interation Due to Varying Soil and Loading Conditions

1995 ◽  
Author(s):  
Shrini Upadhyaya ◽  
Dan Wolf ◽  
William J. Chancellor ◽  
Itzhak Shmulevich ◽  
Amos Hadas
Keyword(s):  
Prediction Model ◽  
Soil Compaction ◽  
Field Tests ◽  
Prediction Equation ◽  
Engineering Properties ◽  
Solution Technique ◽  
Strain Rate Effects ◽  
Disturbed Soil ◽  
Properties Of Soil

The objectives of this study were to investigate soil-pneumatic tire interaction and develop traction-soil compaction prediction model. We have developed an inverse solution technique that employs a response surface methodology to determine engineering properties of soil in-situ. This technique is useful in obtaining actual properties of soil in-situ for use in traction and soil compaction studies rather than using the values obtained in the laboratory by employing remolded and/or disturbed soil samples. We have conducted extensive field tests i the U.S. to develop semi-empirical traction prediction equation for radial ply tires. A user friendly traction-soil compaction program was developed to predict tractive ability of radial ply tires using several different techniques and to estimate soil compaction induced by these tires. A traction prediction model that incorporates strain rate effects on the tractive ability of tires was developed in Israel. A mobile single wheel tester and an in-situ soil test device were developed i Israel to significantly enhance the ability of Israeli investigators to conduct traction-soil compaction research. This project has resulted in close cooperation between UCD, Technion, and ARO, which will be instrumental in future collaboration.

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.

Optimized Foundation Design in Geotechnical Engineering

2019 ◽  
pp. 222-234
Author(s):  
Mounir Bouassida ◽  
Souhir Ellouze ◽  
Wafy Bouassida
Keyword(s):  
Laboratory Tests ◽  
Cost Effective ◽  
Optimized Design ◽  
Effective Solution ◽  
Major Step ◽  
Foundation Design ◽  
Geotechnical Parameters ◽  
To Come ◽  
The Stability

The design of foundations constitutes a major step for each civil engineering structure. Indeed, the stability of those structures relies on cost-effective and adequately designed foundation solutions. To come up with an optimized design of a foundation, the geotechnical study passes several steps: the geotechnical survey including in situ and laboratory tests, the synthesis of geotechnical parameters to be considered for the design, and the suggestion of foundation solution avoiding over estimated cost and ensuring suitable method of execution. In this chapter, the three currently practiced categories of foundation are briefly introduced. Then, two illustrative Tunisian case histories are analyzed to explain, first, when the practiced foundation solution was inadequately chosen how a non-cost-effective solution can be avoided, and second, why an unsuitable foundation solution can lead to the stopping of the structure functioning and then how to proceed for the design of retrofit solution to be executed for restarting the functioning of the structure.

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.

Experimental Study on Road Properties of High Liquid Limit Soil in Yunfu Highway

2015 ◽  
Vol 9 (1) ◽  
pp. 46-51 ◽  
Author(s):  
Zhu Lei
Keyword(s):  
Unconfined Compressive Strength ◽  
Laboratory Tests ◽  
Southern China ◽  
Physical And Mechanical Properties ◽  
Liquid Limit ◽  
Engineering Properties ◽  
Filling Material ◽  
Test Results ◽  
Plastic Limit ◽  
Better Than

There are a large number of high liquid limit soil distributed in southern China. As one of the special soils commonly seen in highway construction, high liquid limit soil cannot be used in subgrade filling directly due to its special engineering properties. With the idea of saving engineering investment and protecting environment, high liquid limit soil must be improved to be qualified subgrade filling material. First, detailed laboratory tests are carried out to reveal the special properties of high liquid limit soil. Then, based on the characters of high liquid limit soil, the improving tests of liquid plastic limit, unconfined compressive strength, CBR and compaction are completed by adding different percentages of quicklime and white lime to the high liquid limit soil to study the change in the physical and mechanical properties and strength. The results show that, after being improved by lime, the high liquid limit soil can be used as subgrade filling of expressway as its liquid limit, plastic index being reduced, the strength increased and the value of CBR increased remarkably, and modified effectiveness of quicklime is better than that of white lime. Through comparison and analysis of the test results, it is found that high liquid limit soil with 5% quicklime can be used as subgrade filling material for highway since it is not only economical but also qualified to meet the requirement of improvement and strength.

Site investigations for unretained excavations in a soft peaty deposit

1984 ◽  
Vol 21 (1) ◽  
pp. 36-59 ◽  
Author(s):  
Sandro S. Sandroni ◽  
José Maria J. Silva ◽  
José Carlos Novello Pinheiro
Keyword(s):  
Laboratory Investigation ◽  
Laboratory Tests ◽  
Field Tests ◽  
Retaining Walls ◽  
Full Scale ◽  
Stability Problems ◽  
Site Investigations ◽  
Hydraulic Filling ◽  
Organic Deposit

As part of an urbanization scheme, artificial islands are being created on the swampy land around the Itaipu lagoon, close to Rio de Janeiro. The islands are being formed by hydraulic filling with sand and their periphery consists of retaining walls resting on sand cushions. The very soft local soils pose settlement and stability problems in execution and operation.A site and laboratory investigation program, involving several types of triaxial, consolidation, and in-situ vane tests, has been carried out and is described. A full-scale instrumented settlement fill has been built and is mentioned. An instrumented 5 m deep trial trench has been carried out and monitored during the excavation stage which took 5 days and during a 45 day long repose stage. In both these stages failure was avoided by keeping water inside the trench at its original level. Finally, failure was induced by pumping water out of the trench. The observations at the trial trench are presented and discussed in some detail. Keywords: soft organic deposit, unretained excavation, field tests, laboratory tests, displacements, pore pressures, failure.

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 Choice of Test Methods in Site Investigations

1986 ◽  
Vol 2 (1) ◽  
pp. 289-297 ◽  
Author(s):  
A. Marsland
Keyword(s):  
Laboratory Tests ◽  
Test Methods ◽  
Careful Consideration ◽  
Engineering Properties ◽  
Soil Parameters ◽  
Test Procedures ◽  
Site Investigations ◽  
Soil Fabric ◽  
Design Requirements

AbstractThe appropriate choice of sampling methods, laboratory tests and in situ tests depends upon the type of structure or earthwork being considered, the nature of the ground influenced by the construction and the required accuracy of the prediction. To obtain optimum results requires considerable experience of the design requirements and potential construction problems as well as the test methods and their range of application. Some methods are particularly useful for obtaining continuous profiles and giving a rough indication of the engineering properties while others are designed to provide more basic soil parameters. The results obtained may be sensitive to changes in equipment details, test procedures and methods of interpretation.When empirical relationships are invoked, care is necessary to ensure that identical equipment and procedures have been used and that the correlations have been obtained in similar soils. The degree to which the volumes of soil tested are representative of the soil in the mass is important. Factors such as the orientation of the maximum stresses applied during the tests relative to the directions of the macro fabric features, the degree of stress anisotropy, the directions of the stresses applied to the structure and the effects of disturbance during sampling and insertion of in situ devices need careful consideration.Test data from the most appropriate in situ and laboratory tests should be integrated with soil fabric studies in order to produce the best overall assessments.

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.

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