In situ tests in Brasília porous clay

1996 ◽  
Vol 33 (1) ◽  
pp. 189-198 ◽  
Author(s):  
J A.R Ortigao ◽  
R P Cunha ◽  
L S Alves
Keyword(s):  
Low Cost ◽  
Laboratory Data ◽  
Design Parameters ◽  
Residual Soils ◽  
In Situ Testing ◽  
In Situ Tests ◽  
Deformation Parameters ◽  
Strength And Deformation ◽  
Plate Loading

An in situ testing programme was carried out in 1992 aimed at obtaining design parameters for the construction of the Brasília Underground line, Brazil. The top layer of soil consisted of an unsaturated and collapsible soft porous clay layer 5–30 m thick followed by residual soils from slate and interlayered metasiltsones and quartzites. A series of Marchetti dilatometer (DMT) logging tests results were comapred with Ménard pressuremeter (PMT) and horizontal plate loading (PLH) tests, as well as laboratory tests on block samples. In situ stresses, strength, and deformation parameters were obtained for the porous clay. The DMT yielded very good results: excellent repeatability, low cost, and results that agree with other in situ tests and laboratory data. Key words: porous clay, in situ testing, dilatometer, pressuremeter.

Laboratory Testing: Assessing BS 5930

1986 ◽  
Vol 2 (1) ◽  
pp. 43-52 ◽  
Author(s):  
D. W. Hight
Keyword(s):  
Effective Stress ◽  
Site Investigation ◽  
Triaxial Tests ◽  
Cohesive Soils ◽  
Deformation Parameters ◽  
Strength And Deformation ◽  
Soil Behaviour ◽  
Measured Strength ◽  
Linear Nature

AbstractEstablished patterns of soil behaviour are used to illustrate: the divergence between parameters from laboratory and in situ tests; the changes in effective stress caused by sampling; and the influence of initial effective stress, p′0 on the measured strength and deformation parameters for cohesive soils.Current practice in onshore site investigation continues to make use of the unconsolidated undrained triaxial test in which p′0 is not controlled. Variations in p′0 after sampling and subsequent handling are shown to contribute to the scatter in undrained compression strength data.A plea is made for BS 5930 to encourage the measurement of effective stress in all undrained triaxial tests; to recognise the non-linear nature of soils; and to urge integration of laboratory and in situ tests.

scholarly journals CPT Profiling and Laboratory Data Correlations for Deriving of Selected Geotechnical Parameter

2015 ◽  
Vol 11 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Roman Bulko ◽  
Marián Drusa ◽  
Jozef Vlček ◽  
Martin Mečár
Keyword(s):  
Laboratory Data ◽  
Cost Effective ◽  
Soil Samples ◽  
Geological Survey ◽  
Testing Time ◽  
In Situ Testing ◽  
Time Saving ◽  
Dynamic Penetration ◽  
Penetration Tests

Abstract Currently, can be seen a new trend in engineering geological survey, where laboratory analysis are replaced by in situ testing methods, which are more efficient and cost effective, and time saving too. A regular engineering geological survey cannot be provided by simple core drillings, macroscopic description (sometimes very subjective), and then geotechnical parameters are established based on indicative standardized values or archive values from previous geotechnical standards. The engineering geological survey is trustworthy if is composed of laboratory and in-situ testing supplemented by indirect methods of testing, [1]. The prevalence of rotary core drilling for obtaining laboratory soil samples from various depths (every 1 to 3 m), cannot be a more enhanced as continues evaluation of strata and properties e.g. by CPT Piezocone (every 1 cm). Core drillings survey generally uses small amounts of soil samples, but this is resulting to a lower representation of the subsoil and underestimation of parameters. Higher amounts of soil samples make laboratory testing time-consuming and results from this testing can be influenced by the storage and processing of the soil samples. Preference for geotechnical surveys with in situ testing is therefore a more suitable option. In situ testing using static and dynamic penetration tests can be used as a supplement or as a replacement for the (traditional) methods of surveying.

scholarly journals Development of a Low-Cost UV-Vis Spectrophotometer and Its Application for the Detection of Mercuric Ions Assisted by Chemosensors

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 906 ◽  
Author(s):  
David González-Morales ◽  
Asmilly Valencia ◽  
Astrid Díaz-Nuñez ◽  
Marcial Fuentes-Estrada ◽  
Oswaldo López-Santos ◽  
...  
Keyword(s):  
High Precision ◽  
Low Cost ◽  
Environmental Contaminant ◽  
Measurement Equipment ◽  
In Situ Tests ◽  
Time Duration ◽  
Design Specifications ◽  
Commercial Laboratory ◽  
Mercuric Ions

Detection of an environmental contaminant requires the use of expensive measurement equipment, which limits the realization of in situ tests because of their high cost, their limited portability, or the extended time duration of the tests. This paper presents in detail the development of a portable low-cost spectrophotometer which, by using a specialized chemosensor, allows detection of mercuric ions (Hg2+), providing effective and accurate results. Design specifications for all the stages assembling the spectrophotometer and the elements selected to build them are presented along with the process to synthesize the chemosensor and the tests developed to validate its performance in comparison with a high-precision commercial laboratory spectrophotometer.

Analysis of self-boring pressuremeter (SBPM) and Marchetti dilatometer (DMT) tests in granite saprolites

2000 ◽  
Vol 37 (4) ◽  
pp. 796-810 ◽  
Author(s):  
F Schnaid ◽  
J AR Ortigao ◽  
F M Mántaras ◽  
R P Cunha ◽  
I MacGregor
Keyword(s):  
Site Investigation ◽  
Friction Angle ◽  
Soil Parameters ◽  
Residual Soil ◽  
Residual Soils ◽  
In Situ Tests ◽  
Cemented Sand ◽  
Fundamental Parameters ◽  
Analysis Technique

This paper presents the analyses of the results of the site investigation programme carried out at the Kowloon Bay site in Hong Kong. The tests consisted of self-boring pressuremeter (SBPM), Marchetti dilatometer (DMT), and laboratory tests carried out in a granite saprolite, which can be described as a lightly cemented sand. The purpose of this research project is to stimulate the development of methods to interpret data obtained from tests in residual soils. In particular, the work aims to evaluate the analyses of the SBPM data through a curve-fitting technique. Both the loading and unloading portions of the SBPM curve were analysed and the results compared with those from other tests. The advantage of this analysis technique is the possibility of constructing a theoretical curve that reproduces a pressuremeter test from which a set of fundamental parameters can be derived, namely the friction angle, cohesion intercept, lateral stress, and shear modulus. The DMT proved to be a reliable tool that yielded good soil parameters at a small fraction of the cost of the other in situ tests.Key words: residual soil, in situ tests, pressuremeter, Marchetti dilatometer.

In Situ Testing of Waste Glass in Clay

1993 ◽  
Vol 333 ◽  
Author(s):  
Pierre Ph. Van Iseghem
Keyword(s):  
Waste Glass ◽  
International Expert ◽  
In Situ Testing ◽  
In Situ Tests ◽  
In Situ Test ◽  
Boom Clay ◽  
Mass Losses ◽  
Higher Temperature ◽  
Good Agreement

ABSTRACTThe actual status of an in-situ test programme exposing different waste glass samples directly to Boom clay is reviewed. Corrosion test tubes have been retrieved after residence for 5 years at 16° C, 2 years at 90° C, and 5 years at 170° C. The corrosion is interpreted in terms of mass loss, surface analysis by SEM and profiling by EPMA and SIMS. At 16° C, glasses dissolve about 0.02 – 0.08 µm per year. At higher temperature dissolution is more than two orders of magnitude larger. A good agreement is obtained between the mass losses and the surface analyses. The advantages and limitations of the Belgian in-situ tests are compared with the conclusions of an international expert group.

scholarly journals Evaluation of Stiffness Degradation Curves from in Situ Tests in Various Soil Types

2018 ◽  
Vol 64 (4) ◽  
pp. 285-307
Author(s):  
T. Godlewski
Keyword(s):  
Field Tests ◽  
Shear Stiffness ◽  
Test Methods ◽  
Soil Types ◽  
Design Parameters ◽  
Design Calculation ◽  
In Situ Tests ◽  
Nonlinearity Test ◽  
Strain Dependent

AbstractIncreasingly complex design systems require an individual approach when determining the necessary design parameters. As soils are characterized by strong strain-dependent nonlinearity, test methods used to characterize the subsoil should be carefully selected, in terms of their “sensitivity” as well as suitability for the analyzed type of problem. When direct measurements are not available, while design calculation models require specific parameters, indirect parameter estimation may be used. This approach requires calibration and validation of empirical correlations, based on well documented database of tests and case studies. One of the parameters often used, when analyzing soil-structure interaction problems, is the shear stiffness of the soil and its strain-dependent degradation. The aim of the article is to present the procedure for description and evaluation of soil stiffness based on field tests (CPTU, DMT and SDMT) and a large number of reference curves obtained from laboratory tests (TRX) for selected soil types. On the basis of the given algorithm, it is possible to obtain a stiffness module G0 value at any level of deformation, based on in-situ tests.

Comparison of in Situ and Laboratory Corrosion Experiments with Borosilicate Nuclear Waste Glass

1991 ◽  
Vol 257 ◽  
Author(s):  
Werner Lutze ◽  
Rodney C. Ewing
Keyword(s):  
Nuclear Waste ◽  
Laboratory Data ◽  
Waste Glass ◽  
Simulation Test ◽  
In Situ Tests ◽  
Nuclear Waste Glass ◽  
Systems Simulation ◽  
Long Term Behavior

ABSTRACTThe comparison of laboratory data from the corrosion of borosilicate nuclear waste glass (German SM513LW11 and French R7T7) with data from the Materials Interface Interactions Test (MIIT) and Repository Systems Simulation Test (RSST) illustrates the inherent limitations of in situ tests. Although in situ tests may confirm the short term behavior of waste forms and identify phenomena associated with the repository system, they do not provide the fundamental basis for the extrapolation of long-term behavior.

Design Parameters for Offshore Sands: Use of In Situ Tests

1985 ◽  
pp. 269-292
Author(s):  
T. Lunne ◽  
S. Lacasse ◽  
G. Aas ◽  
C. Madshus
Keyword(s):  
Design Parameters ◽  
In Situ Tests

scholarly journals A Low Cost Potentiostat Device For Monitoring Aqueous Solution

2018 ◽  
Vol 217 ◽  
pp. 04001
Author(s):  
S. N. H. Umar ◽  
E. A. Bakar ◽  
N. M. Kamaruddin ◽  
N. Uchiyama
Keyword(s):  
Metal Ion ◽  
Control Algorithm ◽  
Low Cost ◽  
Environmental Water ◽  
Design Parameters ◽  
Potential Control ◽  
And Performance ◽  
Main Component ◽  
The Cost

This study developed a new design of a low cost potentiostat circuit device. This device is an alternative electrochemical instrument applied for monitoring heavy metal ion in environmental water. It was developed to alleviate the cost burden of equipment procurement and due to the requirement for in-situ application since the existing commercialize devices are bulky and expensive. the main component of the device consist of electronics configuration of operational amplifier. the device was first modelled and simulated to acquire the design parameters and performance. the potential control algorithm was developed on open-source microcontroller platform. A dummy cell was used to validate the capabilities of the device.

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