scholarly journals Relationship between the Shear Strength and the Depth of Cone Penetration in Fall Cone Tests

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Xing Zeng ◽  
Yuheng Li ◽  
Xi Liu ◽  
Jing Yao ◽  
Zhi Lin
Keyword(s):  
Shear Strength ◽  
Limit Equilibrium ◽  
Cone Angle ◽  
Liquid Limit ◽  
Cone Penetration ◽  
Conservation Of Energy ◽  
Limit Index ◽  
The Relationship

The determination of liquid limit is of great significance in the engineering classification of soil and the selection of the control standard of highway subgrade packing and compactness. Based on the research achievements of many scholars on the relationship between the shear strength and the depth of cone penetration in fall cone tests in the liquid limit tests, the process of penetration was analyzed according to the Law of Conservation of Energy, and the expression of K was derived. Then, the expression was verified by the experimental data of different scholars and the existing data of various countries and institutions. And, the results were also compared with those obtained by the previous scholars using limit equilibrium theory. The results indicate that the new expression is in good agreement with the experimental results. K can be predicted well. And so, the shear strength can be calculated based on the depth of cone penetration, and then, the experimental value of the shear strength can be compared with the calculated value through laboratory tests. The influence of cone weight and cone angle on the shear strength calculation was analyzed. In addition, the liquid limit index of different standards was discussed based on the expression of K, and suggestions on how to achieve relative combination of different codes and standards were raised, which was very helpful for international communication.

Simulations of Fall Cone Test in Soil Mechanics Using the Material Point Method

2016 ◽  
Vol 846 ◽  
pp. 336-341 ◽  
Author(s):  
M.A. Llano-Serna ◽  
M.M. Farias ◽  
D.M. Pedroso ◽  
David J. Williams ◽  
D. Sheng
Keyword(s):  
Soil Mechanics ◽  
Material Point Method ◽  
Liquid Limit ◽  
Material Point ◽  
Point Method ◽  
Cone Penetration ◽  
The Relationship ◽  
Large Deformation Problems

The material point method is a particle-based method that uses a double Lagrangian-Eulerian discretisation. This approach has proved its functionality for the simulation of large deformation problems. Such problems are frequent in geotechnical engineering, more specifically those related to penetration during pile driving and conventional in situ tests such as the Cone Penetration Test. The shallow laboratory fall cone test is considered in this paper. This test is widely used for the determination of the liquid limit of clays, but it is also used to study the relationship between penetration (h) and the undrained shear strength of clays (su). Simulations are verified against laboratory vane shear tests and fall cone tests performed on samples of kaolin clay at different moisture contents. Calibrations using a simple penetration-strength (h-su) model are made based on a single coefficient named the cone factor (K). The numerical results closely match both the experimental data and analytical solutions available in the literature.

Estimation of some properties of Champlain clays with the Swedish fall cone

1977 ◽  
Vol 14 (4) ◽  
pp. 571-581 ◽  
Author(s):  
R. Garneau ◽  
J. P. LeBihan
Keyword(s):  
Void Ratio ◽  
Liquid Limit ◽  
Physical Characteristics ◽  
Unit Weight ◽  
Compression Index ◽  
Cone Penetration ◽  
Testing Procedures ◽  
Preconsolidation Pressure ◽  
Marine Clays

A large number of laboratory tests, carried out to determine index and physical characteristics of Champlain marine clays, using conventional testing procedures and the Swedish fall cone tests, have led to reliable relationships between the cone penetration and certain characteristics.The purpose of this study has been to establish a rapid method of estimating some index and physical characteristics of this clay. The method described in this paper allows the estimation of clay properties, such as liquid limit, compression index, preconsolidation pressure, undisturbed and remolded shear strength, sensitivity, water content, void ratio, and unit weight, within as little as half an hour and using a single undisturbed specimen. When testing according to conventional procedures, the determination of these characteristics takes several days or even weeks.This paper presents the method of estimation and the procedure used to establish the relationships between the results obtained by conventional methods and those derived using the Swedish fall cone.

Determination of the Shear Strength of Unsaturated Loess Based on the Fractal Model Theory of Unsaturated Soils

2012 ◽  
Vol 170-173 ◽  
pp. 25-28
Author(s):  
Jing Yu Chen ◽  
Ying Hai
Keyword(s):  
Shear Strength ◽  
Model Theory ◽  
Unsaturated Soils ◽  
Characteristic Curve ◽  
Fractal Model ◽  
North West ◽  
The North ◽  
Unsaturated Loess ◽  
The Relationship

The shear strength value of unsaturated loess is required in the design in geotechnical engineering in the North and the North West of China. In 2004, a new method, that is the fractal model theory, was proposed for determining the shear strength of unsaturated soil. Based upon the fractal model theory, the surface fractal dimension DS and the air entry value of two unsaturated loess samples are obtained from their soil-water characteristic curve (SWCC), the shear strength contribution due to matric suction of the two loess samples is determined, a new approach for determination of the shear strength of unsaturated loess with its SWCC is presented. By comparing results of this paper with those of the laboratory tests, the relationship between the SWCC and the shear strength of unsaturated loess is discussed and the validity of the fractal model theory for unsaturated loess is explained.

scholarly journals Determination of factors and conditions of financial and economic security

KANT ◽  
2020 ◽  
Vol 37 (4) ◽  
pp. 195-201
Author(s):  
Tatyana Rogova
Keyword(s):  
Financial Economic ◽  
Economic Security ◽  
Federal State ◽  
Financial Autonomy ◽  
Interregional Inequality ◽  
Self Development ◽  
Ulyanovsk Region ◽  
The Relationship

The security of a Federal state depends on the level of financial-economic security of its subjects. Goal setting at the regional level is related to strengthening financial autonomy, sustainability, and self-development. Achieving these goals is seen as possible if a sufficient number of diverse resources are available. Therefore, resource availability is a guarantee of security. The classification of financial and economic security factors is given. It is concluded that the key to economic development is to reduce interregional inequality and self-development of the territory. The main budget indicators are calculated for the Ulyanovsk region. In conclusion, a scheme of the relationship between economic policy and financial-economic security.

DETERMINATION OF THE INFLUENCE OF STRUCTURAL ELEMENTS ON ACOUSTIC EFFICIENCY AND BACK PRESSURE IN EXHAUST AND SUCTION NOISE SILENCERS

Akustika ◽  
2021 ◽  
pp. 210-216
Author(s):  
Nickolay Ivanov ◽  
Aleksandr Shashurin ◽  
Aleksandr Burakov
Keyword(s):  
Structural Design ◽  
High Frequency ◽  
Experimental Studies ◽  
Low Frequency ◽  
Back Pressure ◽  
Noise Generation ◽  
Structural Elements ◽  
The Relationship

The features of noise generation processes in exhaust and suction noise silencers are shown. A method for testing silencers has been developed. The classification of the main structural elements of exhaust and suction noise silencers, depending on the purpose, is proposed. Experimental studies of the relationship between the acoustic efficiency and the back pressure of silencers from the structural design of the elements are performed. The factors influencing the efficiency in the low-frequency and high-frequency regions of the spectrum are determined: the volume of silencers, the number of chambers, perforation, sound absorption, flow ejection, etc. Recommendations for the design of noise silencers are proposed.

Maturity and Molt Status of Crustacea: Determining Classification without Prior Criteria

1994 ◽  
Vol 51 (2) ◽  
pp. 408-416 ◽  
Author(s):  
William G. Warren
Keyword(s):  
Iterative Procedure ◽  
A Priori ◽  
Carapace Width ◽  
Snow Crab ◽  
Data Sets ◽  
Chionoecetes Opilio ◽  
Relationship Of ◽  
The Relationship

Existing methodology for estimation is reviewed for the situation where, a priori, the existence of two or more groups can be postulated but, in contrast with discriminant analysis, there is no sample in which the correct categories are known. Such mixture models are applied to two data sets related to the maturity and molt status of snow crab, Chionoecetes opilio, namely (1) the classification of crab as morphometrically mature or immature on the basis of the chela height – carapace width relationship and (2) the determination of the number of molts of crab, during a known period at liberty, from the relationship of size at release and size at recapture of tagged animals, in the latter example, a theoretical constraint is imposed that links the relationships at the different stages. The solution is obtained by "nesting" an iterative procedure within an EM algorithm. The method permits hypotheses concerning the number of groups to be tested, including the hypothesis that the data come from a single homogenous group, and each individual is assigned a probability of belonging to a group.

scholarly journals METHODS OF DETERMINATION OF LIQUID LIMIT IN SOIL MECHANICS AND THE INTERRELATIONSHIP AMONG THESE METHODS

2009 ◽  
Vol 12 (5) ◽  
pp. 68-79
Author(s):  
Ha Thi San Phan ◽  
Son Minh Le
Keyword(s):  
Soil Mechanics ◽  
Liquid Limit ◽  
Soil Samples ◽  
Cohesive Soils ◽  
Methods Of Determination ◽  
Definition Of

"Liquid limit" is one of the most important properties used for classification of soil samples. However, up to now, the definition of this property along with their relevant methods of determination have not been unified yet. This paper attemps to introduce the evolution of methods of determination of liquid limit together with the interrelationship of liquid limits for cohesive soils obtained from these methods. The relationships of liquid limits from different methods are summarized from the researchs of authors since 1957 to 2001.

scholarly journals Determination of undrained shear strength and constrained modulus from DMT for stiff overconsolidated clays

2017 ◽  
Vol 49 (2) ◽  
pp. 107-116 ◽  
Author(s):  
Zbigniew Lechowicz ◽  
Simon Rabarijoely ◽  
Tetiana Kutia
Keyword(s):  
Shear Strength ◽  
Horizontal Stress ◽  
Undrained Shear Strength ◽  
Stress Index ◽  
Constrained Modulus ◽  
Empirical Coefficients ◽  
Horizontal Stress Index ◽  
The Relationship ◽  
Undrained Shear

Abstract The paper presents the results of dilatometer and laboratory tests performed on heavily preconsolidated boulder clays and Pliocene clays prevailing in the Warsaw region. Several different correlations available for evaluating undrained shear strength and constrained modulus from dilatometer tests are discussed. Empirical coefficients for multi-factor correlation to obtain undrained shear strength from dilatometer tests for boulder clays and Pliocene clays were determined. The relationship between factor RM and horizontal stress index (KD) for boulder clays was proposed for the evaluation of constrained modulus from dilatometer tests.

scholarly journals Use of Fall Cone Test for the determination of undrained shear strength of cohesive soils

2018 ◽  
Vol 251 ◽  
pp. 04067
Author(s):  
Diogo Canelas ◽  
Isabel Fernandes ◽  
Maria da Graça Lopes
Keyword(s):  
Shear Strength ◽  
Direct Shear Test ◽  
Shear Test ◽  
Undrained Shear Strength ◽  
Test Methods ◽  
Liquid Limit ◽  
Test Method ◽  
Cohesive Soils ◽  
Undrained Shear

CT156, Geotechnics and civil engineering, has been developing efforts to create standards with the generic designation EN ISO 17892, Geotechnical investigation and testing - Laboratory testing of soil. The recent publication of EN ISO 17892-part 6, Fall Cone Test which describes in detail the use of this test method to estimate the undrained shear strength of cohesive soils leads to the necessity for the laboratories to get familiar with this test method and to acquire the required sensibility to analyse the results obtained. Originally designed to determine the liquid limit of fine soils, for which purpose it is considered as an accurate substitute of the Casagrande method, the method may constitute an alternative to the direct shear test, which takes certainly longer time to be carried out and is more complex. The present work aims to compare the values for liquid limit obtained with the Casagrande's method and the cone method and as well as the use of this test to estimate undrained shear strength, correlating with results from other laboratory tests such as the Direct Shear Test and the Laboratory Vane Test on remoulded samples. The results obtained show that there is a good correlation between the applied test methods for determination of the liquid limit and that, for some water contents, the results obtained by the three test methods are comparable.

Laboratory investigations on the lime stabilization of sensitive clays: shear strength development

1990 ◽  
Vol 27 (3) ◽  
pp. 294-304 ◽  
Author(s):  
Jacques Locat ◽  
Marc-André Bérubé ◽  
Marc Choquette
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Conceptual Models ◽  
Liquid Limit ◽  
Strength Development ◽  
Strength Increase ◽  
Lime Stabilization ◽  
Significant Strength ◽  
Laboratory Investigations ◽  
The Relationship

A laboratory investigation on the quicklime stabilization of sensitive clays has shown that, even at a water content above the liquid limit, significant strength increase can be obtained if enough time and lime are provided. The understanding of strength development is based on the recognition of physical bridging between soil particles, as in a cementation process. The physical and mechanical significance of lime stabilization is described by means of conceptual models. The better the mixing, the better the dispersion and the diffusion of lime and, consequently, the stabilization process. It has been found that the relationship between water content and strength, at a given time, follows a power law that makes possible the establishment of laboratory charts for lime stabilization of such clays. Key words: quicklime stabilization, sensitive clays, cementation, cohesion, shear strength, microstructure, conceptual model, laboratory charts.

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