scholarly journals Hydraulic Conductivity Variation of Coarse-Fine Soil Mixture upon Mixing Ratio

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Choong-Ki Chung ◽  
Joon-Hyoun Kim ◽  
Joonyoung Kim ◽  
Taesik Kim
Keyword(s):  
Hydraulic Conductivity ◽  
Model Verification ◽  
Experimental Investigations ◽  
Mixing Ratio ◽  
Soil Mixture ◽  
Soil Mixing ◽  
Fine Soil ◽  
Conductivity Variation ◽  
Critical Mixing ◽  
Coarse Soil

This paper presents the theoretical and experimental investigations of the hydraulic conductivity variation of the soil mixture that contains two distinct particle size distributions, coarse and fine soils. A new model for the hydraulic conductivity is introduced that focuses on the relationship between the coarse-fine soil mixing ratio and the hydraulic conductivity of the mixture. For the model verification, permeability tests were conducted. The glass beads and quality-controlled standard sand and soils obtained from fields were used for the specimen. The experiment results showed that the hydraulic conductivity of the soil mixture strongly depends on the mixing ratio. As the amount of the coarse soil contained in the fine soil increased, the hydraulic conductivity of the mixture decreased from that for the fine soil until the critical mixing ratio. This ratio is defined as the fine soils perfectly fill the voids between the coarse soils without remains. When the ratio is greater than the critical mixing ratio, the hydraulic conductivity is drastically increased with the mixing ratio up to that of the coarse soil. The comparison between the computed values and the test results shows that the introduced model successfully describes the measurements.

scholarly journals Effect of chelating agents on removal of 137Cs from contaminated soil

2018 ◽  
Vol 15 (35) ◽  
pp. 158-168
Author(s):  
Firas M. Radhi
Keyword(s):  
Removal Efficiency ◽  
Contaminated Soil ◽  
Chelating Agents ◽  
Soil Samples ◽  
Coarse Grained ◽  
Tetraacetic Acid ◽  
Mixing Ratio ◽  
Soil Mixing ◽  
Chemical Washing ◽  
Washing Method

In the present research, the chemical washing method has been selected using three chelating agents: citric acid, acetic acid and Ethylene Diamine Tetraacetic Acid (EDTA) to remove 137Cs from two different contaminated soil samples were classified as fine and coarse grained. The factors that affecting removal efficiency such as type of soil, mixing ratio and molarity have been investigated. The results revealed that no correlation relation was found between removal efficiency and the studied factors. The results also showed that conventional chemical washing method was not effective in removing 137Cs and that there are further studies still need to achieve this objective.

scholarly journals A sample formation procedure to obtain homogeneous post-erosion particle size distribution

2019 ◽  
Vol 92 ◽  
pp. 02015
Author(s):  
Shijin Li ◽  
Adrian R. Russell
Keyword(s):  
Particle Size ◽  
Fine Particles ◽  
Internal Erosion ◽  
Triaxial Tests ◽  
Experimental Investigations ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
The Matrix ◽  
Homogeneous Particle ◽  
Coarse Soil

Internal erosion (suffusion) is caused by water seeping through the matrix of coarse soil and progressively transporting out fine particles. The mechanical strength of soils within water retaining structures may be affected after internal erosion occurs. However, most experimental investigations on the mechanical consequences of internal erosion have used triaxial tests on samples having nonhomogeneous particle size distributions along their lengths. Such nonhomogeneities arise from the most commonly used sample formation procedure, in which seeping water enters one end of a sample and washes fine particles out the other. In this paper a new soil sample formation procedure is presented which results in homogeneous particle size distributions along the direction of seepage, that is at all locations along a sample's length.

Hydraulic conductivity variation within and between layers of a high floodplain profile

2014 ◽  
Vol 515 ◽  
pp. 147-155 ◽  
Author(s):  
Xunhong Chen ◽  
Haicun Mi ◽  
Hongman He ◽  
Ruichong Liu ◽  
Min Gao ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Conductivity Variation

Evaluation of hydraulic conductivity based on grain size distribution parameters using power function model

2018 ◽  
Vol 19 (2) ◽  
pp. 596-602
Author(s):  
Rajat Kango ◽  
Vijay Shankar ◽  
M. A. Alam
Keyword(s):  
Grain Size ◽  
Hydraulic Conductivity ◽  
Size Distribution ◽  
Power Function ◽  
Grain Size Distribution ◽  
Specific Weight ◽  
Experimental Investigations ◽  
Function Model ◽  
Earthen Structures ◽  
Distribution Parameters

Abstract Hydraulic conductivity is a parameter dictating groundwater recharge, having dependability on factors related to aquifer properties such as particle size, shape, degree of compaction, grain size distribution and fluid flow properties like viscosity and specific weight. The present study is focused on the effect of the grain size distribution of the particles of the aquifer material on its permeability. In order to investigate variation of permeability with respect to the grain size distribution, experimental investigations are conducted on natural borehole samples and those prepared by mixing borehole samples with known quantities of marble chips within a laminar flow regime. A power function model is developed for the estimation of permeability based on grain size distribution parameters σ (standard deviation) and D50 (median grain size). The results from the developed model show good agreement with experimental data as the values of R2, RMSE and MAE for the model are (0.99, 0.007, 0.005) for 5.08 cm dia., (0.99, 0.005, 0.004) for 10.16 cm dia. and (0.97, 0.004, 0.003) for 15.24 cm dia. permeameters respectively. The developed power function model provides an efficient tool to estimate the yield of wells, seepage below earthen structures and design of filters with reasonable accuracy.

Saturated hydraulic conductivity variation in a small garden under drip irrigation

2016 ◽  
Vol 19 (6) ◽  
pp. 266-274 ◽  
Author(s):  
Mohammadreza Khaledian ◽  
Mahmoud Shabanpour ◽  
Hajar Alinia
Keyword(s):  
Hydraulic Conductivity ◽  
Drip Irrigation ◽  
Saturated Hydraulic Conductivity ◽  
Conductivity Variation

scholarly journals Experimental investigations for assessing the influence of fly ash on the flow through porous media in Darcy regime

2021 ◽  
Vol 83 (5) ◽  
pp. 1028-1038
Author(s):  
Abhishish Chandel ◽  
Vijay Shankar ◽  
M. A. Alam
Keyword(s):  
Porous Media ◽  
Fly Ash ◽  
Hydraulic Conductivity ◽  
Ash Content ◽  
Sand Fly ◽  
Unit Weight ◽  
Experimental Investigations ◽  
Dry Density ◽  
Empirical Equations ◽  
River Sand

Abstract Hydraulic conductivity plays a vital role in the studies encompassing explorations on flow and porous media. The study investigates the compaction characteristics of a river sand (Beas, Sutlej, and Ghaggar rivers) and fly ash mix in different proportions and evaluates four empirical equations for estimating hydraulic conductivity. Experiments show that an increase in the fly ash content results in a decrease in the maximum dry density (MDD) and an increase in the corresponding optimum moisture content (OMC) of sand–fly ash samples. MDD at optimum fly ash content was achieved at low water content, which resulted in less dry unit weight than that of typical conventional fill. In Beas, Sutlej, and Ghaggar sands the optimum fly ash content up to which the hydraulic conductivity value reduced uniformly was found to be 30, 45, and 40%, respectively. Any further increase in the fly ash content results in a negligible decrease in hydraulic conductivity value. The observed hydraulic conductivity of sand–fly ash mix lies in the range of silts, which emboldens the use of sand–fly ash mix as embankment material. Further, the evaluation of empirical equations considered in the study substantiates the efficacy of the Terzaghi equation in estimating the hydraulic conductivity of river sand-fly ash mix.

scholarly journals Cold mashing - Analysis and optimization of extraction processes at low temperatures in the brewing process

2021 ◽  
Vol 247 ◽  
pp. 01036
Author(s):  
Niklas Schöttke ◽  
Frank Rögener
Keyword(s):  
Low Temperatures ◽  
Point Of View ◽  
Experimental Investigations ◽  
Mixing Ratio ◽  
Fermentation Time ◽  
Positive Effects ◽  
Depth Analysis ◽  
Brewing Process ◽  
Extraction Processes ◽  
Theoretical Considerations

According to indications, already 5,000 years ago beer was brewed without heating the mash, i.e. in the cold mash process. Applying this old method, the question arises to what extent this traditional knowledge can be integrated into today's brewing processes and to produce new beer styles at reduced energy consumption. Since cold mashing is hardly explored, this work is dedicated to in-depth analysis from a process and brewing point of view. Based on theoretical considerations of the mashing process, cold mashing formulations were estimated and analysed. Parameters for the experimental investigations were temperature, particle size of grinded grains, mixing ratio between malt and water, mashing time and the application of various multistage extraction processes. Additionally, at the optimum cold mashing conditions, a brew of about 10 L was produced, which confirmed the positive effects of the application of cold mash: Fermentation time is significantly reduced due to the composition of the cold-extracted malt components.

A Critical Review of Section 8 (BS 5930)—Soil and Rock Description

1986 ◽  
Vol 2 (1) ◽  
pp. 331-342 ◽  
Author(s):  
D. R. Norbury ◽  
G. H. Child ◽  
T. W. Spink
Keyword(s):  
Critical Review ◽  
Current Practice ◽  
List Type ◽  
Borderline Cases ◽  
Section 8 ◽  
Fine Soil ◽  
Weathering Classification ◽  
Definition Of ◽  
Mixed Soils ◽  
Coarse Soil

AbstractBS 5930 proposes fundamental changes to current practice in the description of soils and rocks. The paper reviews these changes and suggests alternative proposals which provide a workable reconciliation between the aims of the new Code and current practical soil and rock description. The main changes made by the Code and the authors' recommendations are:The distinction between fine soil and coarse soil solely on grading is rejected in favour of description according to engineering behaviour.The distinction between silt and clay solely on the basis of the A-line is supplemented with additional terms for borderline cases.Simplification and extension of terminology for description of secondary constituents of mixed soils.Rejection of proposed weathering classification for rocks as inapplicable, in favour of current practice.Clarification of rock nomenclature to conform with geological conventions.The changes to current practice made by BS 5930 are considered to be a retrograde step and could lead to confusion and errors. The paper also considers the process of sample description and attempts to clarify the definition of terms employed in fracture logging of rock core.The paper calls for a revision and reissue of Section 8 of the new Code.

Sign in / Sign up

Export Citation Format

Share Document