Comparison of two criteria for internal stability of granular soil

2008 ◽  
Vol 45 (9) ◽  
pp. 1303-1309 ◽  
Author(s):  
Maoxin Li ◽  
R. Jonathan Fannin
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Distribution Curve ◽  
Seepage Flow ◽  
Granular Soil ◽  
Engineering Practice ◽  
Internal Stability ◽  
Subtle Difference ◽  
Internal Instability ◽  
The Difference

Internal instability describes the loss of soil particles as a result of seepage. Two criteria are commonly used to determine the potential for such instability within a granular soil that is subject to seepage flow. The criteria are similar, in that they both require an evaluation of the slope of the grain-size distribution curve. However, the manner in which the evaluation is made yields a subtle difference between the respective methods. Comparison of the methods reveals that the difference can have implications for evaluation of broadly graded soils, and guidance is suggested for their use with greater confidence in engineering practice.

Similarity of internal stability criteria for granular soils

1992 ◽  
Vol 29 (4) ◽  
pp. 711-713 ◽  
Author(s):  
Robert P. Chapuis
Keyword(s):  
Grain Size ◽  
Groundwater Flow ◽  
Distribution Curve ◽  
Fine Particles ◽  
Frost Damage ◽  
Granular Soils ◽  
Internal Stability ◽  
Stability Criteria ◽  
Mathematical Expressions ◽  
Internal Instability

Internal instability produces segregation in fine particles, modifies drainage properties, and increases pore pressures, capillary retention, and possible frost damage. Three criteria are commonly used to assess the internal instability of granular soils. It is shown here that they can take similar mathematical expressions where the secant slope of the grain-size distribution curve indicates the risk of internal instability. Key words : suffossion, groundwater flow, gradation.

Internal stability of granular filters

1985 ◽  
Vol 22 (2) ◽  
pp. 215-225 ◽  
Author(s):  
T. C. Kenney ◽  
D. Lau
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Particle Size Distribution ◽  
Granular Material ◽  
Key Words ◽  
Distribution Curve ◽  
Internal Stability ◽  
Small Particles ◽  
Particle Size Distribution Curve ◽  
Internal Instability

Internal stability of a granular material results from its ability to prevent loss of its own small particles due to disturbing forces such as seepage and vibration. Internal instability results from the inability of a soil to act as a filter to prevent loss of its own small particles.Within pores in the load-bearing fabric of a cohesionless, granular material there can exist loose particles, and whether or not these particles can be removed by seepage depends on (i) particle size distribution curve of the whole material, (ii) density of the compacted material, and (iii) severity of the disturbing forces.Results of seepage tests are presented for a variety of compacted, cohesionless materials, some of which experienced loss of small particles (unstable gradings) and others of which experienced no such loss (stable gradings). From a synthesis of these results a method is proposed for evaluating the potential for grading instability based on the shape of a material's grain size curve. However, the surest method of making such an evaluation is to perform seepage tests following the procedure described in the paper. Key words: internal stability, grading stability, suffosion, tests, filters.

Effect of grain size distribution on the maximum and minimum void ratios of granular soils

2020 ◽  
Vol 17 (2) ◽  
pp. 26-33
Author(s):  
Jose Duque ◽  
William Mario Fuentes Lacouture ◽  
Jorge Andres Barros Ayala
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Granular Soil ◽  
Granular Soils ◽  
Size Distributions ◽  
Experimental Procedure ◽  
Practical Applications ◽  
Grain Size Distributions ◽  
Properties Of Soil

The maximum and minimum void ratios define the loosest and densest conditions of a granular soil. Correlations with some granulometric properties of soil are of interest for practical applications, but the experimental procedure to determine these variables can be time consuming. In this work the influence of the grain size distribution on the maximum and minimum void ratios is investigated. Twenty different granular soils with varying grain size distributions were prepared and tested. The experimental results, together with a compilation of 56 additional results reported in the literature, are statistically analysed. The analysis is conducted to examine the influence of some granulometric properties (D10, D30 and D60) on the maximum and minimum void ratios. As a result, some correlations considering the aforementioned variables are proposed. Subsequently, it is shown that the proposed correlations have better agreement with the experimental data than other proposals reported in the literature. The paper ends with some concluding remarks.

Relation Between the Mechanical Specific Energy, Cuttings Morphology, and PDC Cutter Geometry

2014 ◽  
Author(s):  
Babak Akbari ◽  
Stefan Miska ◽  
Mengjiao Yu ◽  
Evren Ozbayoglu
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Rock Fracture ◽  
Confining Pressure ◽  
Mechanical Specific Energy ◽  
Minimum Particle Size ◽  
Testing Facility ◽  
The Difference

This paper discusses a series of experiments performed on Carthage Marble Limestone rock samples in a high pressure single PDC cutter testing facility. The tests were performed at 450 psi confining pressure conditions and four different cutters were used. Two different cutter diameter sizes of 13 mm and 16 mm, each with two different chamfer sizes of 0.010 inch and 0.016 inch were tested. Effect of the cutter geometry on the MSE of the cutting action and grain size distribution are discussed in this paper. The experimental results show that, in the tested range, the difference between the MSE when the two different cutter sizes are considered is insignificant. On the other hand, the results show that a change in the chamfer length from 0.010 inch to 0.016 inch can significantly increase the required MSE (as much as 20%). The cuttings produced at each test were gathered and tested in a particle size testing facility and the results were analyzed to determine which drilling parameters can be best correlated to the particle size distribution of the cuttings. The results show that the minimum particle size of the cuttings has a relatively strong dependency on the MSE of each test. The minimum particle size decreases as the MSE of the cutting increases and this is closely related to the extra energy required to regrind and crush the rock as a consequence of decreased drilling efficiency. In fact, the MSE can be estimated by the rock fracture surface energy and the grain size distribution.

Use of the grain-size distribution for estimation of the soil-water characteristic curve

2002 ◽  
Vol 39 (5) ◽  
pp. 1103-1117 ◽  
Author(s):  
Murray D Fredlund ◽  
G Ward Wilson ◽  
Delwyn G Fredlund
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Soil Water ◽  
Grain Size Distribution ◽  
Unsaturated Soil ◽  
Soil Property ◽  
Characteristic Curve ◽  
Engineering Practice ◽  
Soil Water Characteristic Curve ◽  
Mass Properties

The implementation of unsaturated soil mechanics into engineering practice is dependent, to a large extent, upon an ability to estimate unsaturated soil property functions. The soil-water characteristic curve (SWCC), along with the saturated soil properties, has proven to provide a satisfactory basis for estimating the permeability function and shear strength functions for an unsaturated soil. The volume change functions have not been totally defined nor applied in geotechnical engineering. The objective of this paper is to present a procedure for estimating the SWCC from information on the grain-size distribution and the volume–mass properties of a soil. SWCCs represent a continuous water content versus soil suction relationship. The proposed method provides an approximate means of estimating the desorption curve corresponding to a soil initially slurried near the liquid limit. The effects of stress history, fabric, confining pressure, and hysteresis are not addressed. A database of published data is used to verify the proposed procedure. The database contains independent measurements of the grain-size distribution and the SWCC. The level of fit between the estimated and measured SWCCs is analyzed statistically. The proposed procedure is compared to previously proposed methods for predicting the SWCC from the grain-size distribution. The results show that the proposed procedure is somewhat superior to previous methods.Key words: soil-water characteristic curve, grain-size distribution, volume-mass properties, pedo-transfer function, unsaturated soil property functions.

scholarly journals Comparison of laser diffraction method and hydrometer method for soil particle size distribution analysis

2021 ◽  
Vol 24 (1) ◽  
pp. 49-55
Author(s):  
Kateřina Sedláčková ◽  
Lenka Ševelová
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Distribution Curve ◽  
Diffraction Method ◽  
Laser Diffraction ◽  
Soil Science ◽  
Distribution Analysis

Abstract The article aims to present a comparative study of two methods used to determine the particle size distribution of fine and medium coarse soils. These methods are used to determine the grain size distribution curve in practice; however, for different purposes. The classical sedimentation method, based on the Stoke’s sedimentation law (hydrometer, areometric, the Casagrande’s method), standardized for a geotechnical classification of soils was compared with the laser diffraction method on the Mastersizer 3,000 analyser used for soil science purposes. The first comparison on nine samples showed significant differences, especially for larger fractions above 0.01 mm. All measured values of falls from laser diffraction analysis (LDA) showed higher values of all analysed fractions. It was also interesting to follow the trend between the tests for the preparation of conversion factors. The analysis also outlined the direction for further comparison. For the geotechnical use of the LDA, it will be necessary to take into account the sample preparation and processing before analysis.

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