Standard penetration test procedures and the effects in sands of overburden pressure, relative density, particle size, ageing and overconsolidation

1987 ◽  
Vol 24 (1) ◽  
pp. A5
Keyword(s):  
Particle Size ◽  
Relative Density ◽  
Standard Penetration Test ◽  
Penetration Test ◽  
Test Procedures ◽  
Overburden Pressure

Field Testing: The Standard Penetration Test

1986 ◽  
Vol 2 (1) ◽  
pp. 21-26 ◽  
Author(s):  
S. Thorburn
Keyword(s):  
Field Testing ◽  
Standard Penetration Test ◽  
Cohesive Soils ◽  
Test Results ◽  
Penetration Test ◽  
Test Procedures ◽  
Weak Rocks ◽  
Fine Grained ◽  
Introductory Lecture ◽  
Strength And Stiffness

AbstractThis introductory lecture discusses the international use of the standard penetration test (SPT) and presents the proposals for International Reference Test Procedures. The application of the SPT as a means of assessing the strength and stiffness of weak rocks is mentioned together with the reliance upon the test at the present time for estimating the liquefaction potential of saturated fine grained non-cohesive soils. The various aspects of the execution of the SPT are discussed which can provide variable and unrepresentative values of resistance (N values).The principle of measuring energy losses and making adjustments to the N values is introduced as a basis for ensuring comparability of test results.Reference is made to the general descriptions of the SPT given in BS 5930:1981 and to the lack of clear guidance in this British Standard.

Correlation between standard penetration test values and overburden pressure for desert sands

1988 ◽  
Vol 25 (3) ◽  
pp. 590-594 ◽  
Author(s):  
Nabil F. Ismael ◽  
A. M. Jeragh ◽  
O. A. Khalidi ◽  
M. A. Mollah
Keyword(s):  
Calcareous Soils ◽  
Field Tests ◽  
Field Testing ◽  
Standard Penetration Test ◽  
Testing Procedure ◽  
Silica Sand ◽  
Correction Factors ◽  
Penetration Test ◽  
Overburden Pressure ◽  
Pressure Standard

The influence of the effective overburden pressure on the standard penetration test (SPT) values in calcareous desert sands is examined by field tests. A simple field testing procedure is proposed and employed in Kuwait at five sites having different relative densities for the surface soils. The correction factors for the SPT are determined from test results and compared with the most reliable correlations for clean silica sand. Key words: field tests, plate bearing tests, overburden pressure, standard penetration test, correction factors, relative density, calcareous soils, shear strength, compressibility.

The Use of Rheology for Sludge Characterization

1982 ◽  
Vol 14 (6-7) ◽  
pp. 475-489 ◽  
Author(s):  
H W Campbell ◽  
P J Crescuolo
Keyword(s):  
Particle Size ◽  
Sewage Sludge ◽  
Test Procedures ◽  
Particle Size Reduction ◽  
Rotational Viscometer ◽  
Polymer Addition ◽  
Rheological Measurements ◽  
Acceleration Rate ◽  
Sludge Characterization ◽  
Potential Use

Rheological measurements were conducted on a variety of anaerobically digested sewage sludges to evaluate the potential use of rheology in describing the effects of chemical conditioning on the physical characteristics of sludges. The objectives of the study were to evaluate the influence of the method of chemical conditioning on rheological measurements; to determine the response of the viscometer system to changes in the instrument variables; and to evaluate interrelationships between rheology and other physical properties. All rheological measurements were made using a coaxial rotational viscometer. Evaluation of a variety of test procedures identified that both the method of adding chemical conditioners, and the acceleration rate of the rotational viscometer, could significantly alter the shape of the rheograms. A suggested methodology was identified and selected samples were analyzed in triplicate to test the reproducibility of the procedures. Existing mathematical models do not adequately describe the variety of flow behaviour patterns observed with sewage sludge. The concepts of yield stress and apparent viscosity also have limited value due to problems of definition and calculation. A parameter termed the “instantaneous viscosity”, defined as the derivative of the flow curve, is suggested as being more suitable for describing sludge behaviour. The relationships between chemical conditioning, particle size distribution and applied shear were explored. As polymer addition increased, the sludge particles became more susceptible to shear breakup. The extent of particle size reduction was a function of the rate of shear and the time during which the shear was maintained.

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