Classification and Identification Properties of Soils

2015 ◽  
pp. 116-179
Keyword(s):  
Classification System ◽  
Soil Classification ◽  
Classification Systems ◽  
Coarse Grained ◽  
Index Properties ◽  
Fine Grained ◽  
State Highway ◽  
Highway Transportation ◽  
Density Index

Soil texture and soil structure are both unique properties of soil that have profound effects on their behavior. The index properties commonly used for coarse-grained soils are grain size distribution and relative density. Index properties of fine-grained soils include consistency and sensitivity. These properties of a soil indicate the type and conditions of the soil and provide a relationship to its structural properties such as strength, compressibility, permeability, swelling potential, etc. Brief descriptions of some of these properties are given in this chapter. Towards the end, the chapter shows how these properties can be used for the classification of soils. The Soil Classification Systems considered include the following: Geological and Pedological Classification Systems (Classification by Origin and by Pedology), Morphological Classification Systems (Classification by Appearance and Textural Soil Classification System [USDA]), and Classification by Use (American Association of State Highway Transportation Officials System [AASHTO] and Unified Soil Classification System [USCS]).

Computerized Cone Penetration Test for Soil Classification

2008 ◽  
Vol 2053 (1) ◽  
pp. 47-64 ◽  
Author(s):  
Murad Y. Abu-Farsakh ◽  
Zhongjie Zhang ◽  
Mehmet Tumay ◽  
Mark Morvant
Keyword(s):  
Classification System ◽  
Soil Classification ◽  
Cone Penetration Test ◽  
Classification Systems ◽  
Fuzzy Classification ◽  
Classification Methods ◽  
Penetration Test ◽  
Cone Penetration ◽  
Cone Tip Resistance ◽  
Tip Resistance

Computerized MS-Windows Visual Basic software of a cone penetration test (CPT) for soil classification was developed as part of an extensive effort to facilitate the implementation of CPT technology in many geotechnical engineering applications. Five CPT soil engineering classification systems were implemented as a handy, user-friendly, software tool for geotechnical engineers. In the probabilistic region estimation and fuzzy classification methods, a conformal transformation is first applied to determine the profile of soil classification index (U) with depth from cone tip resistance (qc) and friction ratio (Rf). A statistical correlation was established in the probabilistic region estimation method between the U index and the compositional soil type given by the Unified Soil Classification System. Conversely, the CPT fuzzy classification emphasizes the certainty of soil behavior. The Schmertmann and Douglas and Olsen methods provide soil classification charts based on cone tip resistance and friction ratio. However, Robertson et al. proposed a three-dimensional classification system that is presented in two charts: one chart uses corrected tip resistance (qt) and friction ratio (Rf); the other chart uses qt and pore pressure parameter (Bq) as input data. Five sites in Louisiana were selected for this study. For each site, CPT tests and the corresponding soil boring results were correlated. The soil classification results obtained using the five different CPT soil classification methods were compared.

Evolution of Hotel Classification System in Russian Federation

2021 ◽  
Vol 12 (1) ◽  
pp. 277
Author(s):  
Dmitry Aleksandrovich KOZLOV
Keyword(s):  
Russian Federation ◽  
Classification System ◽  
State Standards ◽  
Classification Systems ◽  
International Standards ◽  
Economic Activities ◽  
World Tourism Organization ◽  
The Russian Federation ◽  
Tourism Organization

The main aim of this paper is to analyze the approaches to the system of classification of accommodation facilities in the Russian Federation. The United Nations World Tourism Organization pays great attention to the unification of classification systems for accommodation facilities in all countries of the world, issuing appropriate recommendations on tourism statistics systems, classification of economic activities, as well as criteria for interregional harmonization. In the Russian Federation, there are a number of laws, regulations, state standards, building and sanitary norms and rules concerning the classification of accommodation facilities. They are so imperfect that they have to be revised almost annually or even several times a year. The general statistics of accommodation facilities currently do not correspond to world recommendations. The classification system needs to be revised and brought into line with international standards as much as possible.

A multivariate method for matching soil classification systems, with an Australian example

Soil Research ◽  
2020 ◽  
Vol 58 (6) ◽  
pp. 519
Author(s):  
H. F. Teng ◽  
R. A. Viscarra Rossel ◽  
R. Webster
Keyword(s):  
Vector Space ◽  
Classification System ◽  
Near Infrared ◽  
Soil Classification ◽  
Classification Systems ◽  
Near Infrared Reflectance ◽  
Local Systems ◽  
Soil Units ◽  
International Systems ◽  
Australian Soil

Differences between local systems of soil classification hinder the communication between pedologists from different countries. The FAO–UNESCO Soil Map of the World, as a fruit of world-wide collaboration between innumerable soil scientists, is recognised internationally. Ideally, pedologists should be able to match whole classes in their local systems to those in an international soil classification system. The Australian Soil Classification (ASC) system, created specifically for Australian soil, is widely used in Australia, and Australian pedologists wish to translate the orders they recognise into the FAO soil units when writing for readers elsewhere. We explored the feasibility of matching soil orders in the ASC to units in the FAO legend using a multivariate analysis. Twenty soil properties, variates, of 4927 profiles were estimated from their visible–near infrared reflectance (vis–NIR) spectra. We arranged the profiles in a Euclidean 20-dimensional orthogonal vector space defined by standardised variates. Class centroids were computed in that space, and the Euclidean distances between the centroids of the ASC orders and units in the FAO scheme were also computed. The shortest distance between a centroid of any ASC order and one of units in the FAO classification was treated as a best match. With only one exception the best matches were those that an experienced pedologist might expect. Second and third nearest neighbours in the vector space provided additional insight. We conclude that vis–NIR spectra represent sufficiently well the essential characters of the soil and so spectra could form the basis for the development of a universal soil classification system. In our case, we could assign with confidence the orders of the ASC to the units of the FAO scheme. A similar approach could be applied to link other national classification systems to one or other international systems of soil classification.

scholarly journals Classification and treatment of endothermal heat-induced thrombosis: Recommendations from the American Venous Forum and the Society for Vascular Surgery This Practice Guidelines document has been co-published in Phlebology [DOI: 10.1177/0268355520953759] and Journal of Vascular Surgery: Venous and Lymphatic Disorders [DOI: 10.1016/j.jvsv.2020.06.008]. The publications are identical except for minor stylistic and spelling differences in keeping with each journal’s style. The contribution has been published under a Attribution-Non Commercial-No Derivatives 4.0 International (CC BY-NC-ND 4.0), (https://creativecommons.org/licenses/by-nc-nd/4.0/).

2020 ◽  
pp. 026835552095375
Author(s):  
Lowell S. Kabnick ◽  
Mikel Sadek ◽  
Haraldur Bjarnason ◽  
Dawn M. Coleman ◽  
Ellen D. Dillavou ◽  
...  
Keyword(s):  
Vascular Surgery ◽  
Classification System ◽  
Treatment Guidelines ◽  
Oral Anticoagulants ◽  
Direct Oral Anticoagulants ◽  
Duplex Ultrasound ◽  
Classification Systems ◽  
The Body ◽  
The Novel

The American Venous Forum (AVF) and the Society for Vascular Surgery set forth these guidelines for the management of endothermal heat-induced thrombosis (EHIT). The guidelines serve to compile the body of literature on EHIT and to put forth evidence-based recommendations. The guidelines are divided into the following categories: classification of EHIT, risk factors and prevention, and treatment of EHIT. One major feature is to standardize the reporting under one classification system. The Kabnick and Lawrence classification systems are now combined into the AVF EHIT classification system. The novel classification system affords standardization in reporting but also allows continued combined evaluation with the current body of literature. Recommendations codify the use of duplex ultrasound for the diagnosis of EHIT. Risk factor assessments and methods of prevention including mechanical prophylaxis, chemical prophylaxis, and ablation distance are discussed. Treatment guidelines are tailored to the AVF EHIT class (ie, I, II, III, IV). Reference is made to the use of surveillance, antiplatelet therapy, and anticoagulants as deemed indicated, and the recommendations incorporate the use of the novel direct oral anticoagulants. Last, EHIT management as it relates to the great and small saphenous veins is discussed.

scholarly journals The Logic Behind the Classification of Sciences in the Arab-Islamic Classification Systems: with the Modern Western Classification Systems An Analytical Comparative Reading

2016 ◽  
Vol 7 (3) ◽  
pp. 69
Author(s):  
Nahed Mohamad Basyoni Salem
Keyword(s):  
Analytical Method ◽  
Classification System ◽  
Classification Systems ◽  
Library Of Congress ◽  
Scientific Methods ◽  
Rules And Principles ◽  
Modern Classification ◽  
Decimal Classification

This study aimed to explore the rules and principles adopted in the Arab-Islamic Classification Systems and tried to identify their scientific methods to determine the relations between sciences. The study followed the comparative analytical method to analyze and compare the Arab-Islamic Classification Systems with the Western modern ones represented in the Dewey Decimal Classification System and the Library of Congress Classification System. The research tries to explore the logic behind classification of sciences in the Arab-Islamic Classification Systems. The findings revealed that the Arab-Islamic Classification Systems follow the same rules and principles of modern classification systems and their types are represented in the types of modern Western classification systems. The study recommends the need to conduct research on the Arab-Islamic Classification Systems and introduce it. 

scholarly journals The classifications of subaxial cervical spine traumatic injuries. Part 4. AOSpine Subaxial Classification System

2021 ◽  
Vol 27 (1) ◽  
pp. 3-10
Author(s):  
Oleksii S. Nekhlopochyn ◽  
Ievgenii I. Slynko ◽  
Vadim V. Verbov
Keyword(s):  
Cervical Spine ◽  
Treatment Strategy ◽  
Classification System ◽  
Neurological Status ◽  
Classification Systems ◽  
Cervical Spine Injuries ◽  
Subaxial Cervical Spine ◽  
Spine Injuries ◽  
Injury Classification

Cervical spine injuries are a fairly common consequence of mechanical impact on the human body. The subaxial level of the cervical spine accounts for approximately half to 2/3 of these injuries. Despite the numerous classification systems that exist for describing these injuries, the recommendations for treatment strategy are very limited, and currently none of them is universal and generally accepted. Consequently, treatment decisions are based on the individual experience of the specialist, but not on evidence or algorithms. While the classification system based on the mechanism of trauma originally proposed by B.L. Allen et al. and subsequently modified by J.H. Harris Jr et al., was comprehensive, but lacked evidence, which to some extent limited its clinical applicability. Similarly, the Subaxial Injury Classification System proposed by the Spine Trauma Group, had no distinct and clinically significant patterns of morphological damage. This fact hindered the standardization and unification of tactical approaches. As an attempt to solve this problem, in 2016 Alexander Vaccaro, together with AO Spine, proposed the AO Spine subaxial cervical spine injury classification system, using the principle of already existing AOSpine classification of thoracolumbar injuries. The aim of the project was to develop an effective system that provides clear, clinically relevant morphological descriptions of trauma patterns, which should contribute to the determination of treatment strategy. The proposed classification of cervical spine injuries at the subaxial level follows the same hierarchical approach as previous AO classifications, namely, it characterizes injuries based on 4 parameters: (1) injury morphology, (2) facet damage, (3) neurological status, and (4) specific modifiers. The morphology of injuries is divided into 3 subgroups of injuries: A (compression), B (flexion-distraction), and C (dislocations and displacements). Damage types A and B are divided into 5 (A0-A4) and 3 (B1-B3) subtypes, respectively. When describing damage of the facet joints, 4 subtypes are distinguished: F1 (fracture without displacement), F2 (unstable fracture), F3 (floating lateral mass) and F4 (dislocation). The system also integrates the assessment of neurological status, which is divided into 6 subtype). In addition, the classification includes 4 specific modifiers designed to better detail a number of pathological conditions. The performance evaluation of AOSpine SCICS showed a moderate to significant range of consistency and reproducibility. Currently, a quantitative scale for assessing the severity of classification classes has been proposed, which also, to a certain extent, contributes to decision-making regarding treatment strategy.

scholarly journals Effect of Determination Method on the Liquid Limit of Quaternary Soils

2020 ◽  
Vol 1 (3) ◽  
pp. 24-30
Author(s):  
Abbas J. Al-Taie
Keyword(s):  
Design Process ◽  
Geotechnical Engineering ◽  
Primary Source ◽  
Soil Classification ◽  
Liquid Limit ◽  
Atterberg Limits ◽  
Cone Penetrometer ◽  
Index Properties ◽  
Determination Method

The design process in geotechnical engineering has been vastly affected by Atterberg limits. There are wide variances in the results of liquid limit(LL)determined by different methods. It thought that the procedure used in the test is the primary source of these variances. The research reported in this paper was carried out to find the extent of the proper variance caused by the procedure used to determine the LL of quaternary soils. The effect of this variance on soil classification and activity (A) were included thoroughly. The LL was determined by six methods. They are the Casagrande hard-base and soft-base devices (multi-point and one-point method, and multi-point and one-point cone penetrometer methods. It was found that the index properties obtained from hard-base Casagrande device are differed significantly when compared with other methods. The variance noted was great enough to change LL and change the classification of soil from CL to CH and cause an error in computing A.

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