scholarly journals Experimental Study on Shear Resistance of Carex-Root-Fibered Soil

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
Feng-Chi Wang ◽  
Ming-Ze Zhao ◽  
Qi Sun
Keyword(s):  
Shear Strength ◽  
Soil Moisture ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Friction Angle ◽  
Fiber Content ◽  
Soil Consolidation ◽  
And Performance ◽  
The Relationship ◽  
Root Fiber

Carex shows strong vitality, adaptability, and performance with regard to soil consolidation and slope protection but is often disregarded as a weed. This study proposes to turn this so-called weed into treasure, using its characteristics to protect the slope. We studied the interaction between the carex roots and soil and compared it to other types of grass. To understand the interaction between the carex roots and soil, this study investigated the tensile properties of the carex root fibers. The effects of fiber content, humidity, distribution, and soil moisture content on the relationship between the shear strength and vertical pressure of the soil were analyzed using a direct shear test. Furthermore, the cohesion and internal friction angle were used to evaluate the shear strength of the root-fibered soil based on Mohr–Coulomb’s law. The results showed that the smaller the diameter, the shorter the length, and the greater the quantity and the lower the humidity of the root fibers, the higher the tensile strength of root fibers. In addition, the soil strength could be improved by the joint action of the roots and the soil. With an increase in the root fiber content and humidity, the soil moisture content decreased, whereas the shear strength of the carex-root-fibered soil increased. Here, four kinds of root fiber distributions, namely, “glyph,” “herringbone,” “eccentric,” and “vertical,” were chosen to study the shear strength of the root-fibered soil. The results showed that “glyph” root fiber distribution had the highest shear strength, while the shear strength decreased for the others.

scholarly journals Shear Strength Characterization of Bauxite Deposits in Kuantan, East Coast Malaysia

2019 ◽  
Vol 8 (3S3) ◽  
pp. 404-407
Keyword(s):  
Shear Strength ◽  
Moisture Content ◽  
East Coast ◽  
Field Performance ◽  
Friction Angle ◽  
Parent Rock ◽  
Index Tests ◽  
Strength Characterization ◽  
The Relationship

Engineering characterization which are useful for "temperate" zone soils usually fail to predict the field performance of bauxitic soils, because the index tests upon which the characterization are based are not always reproducible for bauxitic soils. Fifteen (15) bauxitic soil of undisturbed and disturbed samples from 3 distinct sites in Kuantan, all derived from basalt parent rock but representing various stages of weathering were subjected to engineering and mineralogic tests. Values for cohesion and friction angles are evaluated. Soils from Semambu has the highest moisture content of 33.27%, the cohesion value is however lower compared to Bukit Goh which has moisture content of 21.74%. Study are further done to discover the relationship with cohesion and friction angles. Thus, by measuring the cohesion and friction angle can evaluate the performance of bauxite shear strength.

Study of Correlation on Unconfined Compressive Strength between Different Soil

2013 ◽  
Vol 838-841 ◽  
pp. 926-929
Author(s):  
Xia Zhao
Keyword(s):  
Compressive Strength ◽  
Soil Moisture ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Laboratory Tests ◽  
Soil Moisture Content ◽  
Correlation Coefficients ◽  
Friction Angle ◽  
Silty Clay ◽  
Soil Cohesion

Take the silty clay and clay as the research object, the correlation between bulk density, moisture content, cohesion, friction angle and unconfined compressive strength was analyzed using laboratory tests, and the results showed that soil cohesion, friction angle and unconfined compressive strength with good correlation, the correlation coefficients were all above 0.9, while severe and soil moisture content and unconfined compressive strength of correlation is weak, followed by the correlation formulas of the index and unconfined compressive strength were established, these formulas can used to predict the unconfined compressive strength of soil.

scholarly journals Drainage criteria for soil workability.

1979 ◽  
Vol 27 (1) ◽  
pp. 27-35
Author(s):  
L.K. Smedema
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Soil Management ◽  
Field Capacity ◽  
Design Criteria ◽  
Plastic Limit ◽  
Drainage Design ◽  
Relationship Of ◽  
The Relationship

Drainage requirements for workability are formulated on the basis of the soil moisture content at the lower plastic limit, and the relationship of the latter value to field capacity is investigated. Current drainage design criteria are analysed with respect to soil workability requirements; it is concluded that there is little technical and even less economic scope for improving soil workability by adopting stricter criteria, leading to narrower drain spacings. However, a case can be made for increasing the drain depth in medium and heavy textured soils beyond the commonly applied depth of about 100 cm, in the Netherlands. The effects of soil management on soil workability are briefly discussed. (Abstract retrieved from CAB Abstracts by CABI’s permission)

scholarly journals Slope Stability from a Hydrological Perspective: Taking Typical Soil Slope as an Example

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Yuelu Zhu ◽  
Yaoting Xiao
Keyword(s):  
Shear Strength ◽  
Soil Moisture ◽  
Moisture Content ◽  
Slope Stability ◽  
Soil Moisture Content ◽  
Stable State ◽  
Temporal Distribution ◽  
Stability Factor ◽  
Infiltration Capacity ◽  
Increasing Trend

In the traditional research of slope stability, it is difficult to continuously obtain the moisture content of soil in long time sequences. In combination with the precipitation, temperature, and vegetation cover data in the study area, the variable infiltration capacity hydrological model is used to estimate the daily variation of soil moisture content, which is used as a calculation condition for the analysis of slope stability. The results show that, from 1970 to 2010, the spatial-temporal distribution of soil moisture content in the Weihe River Basin showed an increasing trend. Moreover, the shear strength of soil decreased, but the range was stable at approximately 2%. The strength reduction method based on the M-C inscribed circle criterion (DP3) shows that the slope stability factor k had an increasing trend for over 40 y. The portion of the period with a k value higher than 1.2 is more than 85% of the entire period, that with a k value between 1 and 1.2 is approximately 9%, and that with a k value less than 1 is approximately 5.5%. The R/S analysis results show that the Hurst coefficients of the τ-t curve and the k-t curve are 0.5568 and 0.5888, respectively, and that the slope is in a state of no variation. Based on these factors, the present and future of the slope is in a stable state. This scheme is a method of studying slope stability based on hydrology, and it provides a modern alternative for soil shear strength calculation and geological hazard assessment.

Constitutive Model of Shallow Landslides Catastrophe Theory under the Heavy Rainfall

2012 ◽  
Vol 166-169 ◽  
pp. 2718-2721
Author(s):  
Sheng Guo Cheng ◽  
Hong Zheng
Keyword(s):  
Shear Strength ◽  
Soil Moisture ◽  
Moisture Content ◽  
Constitutive Model ◽  
Catastrophe Theory ◽  
Heavy Rainfall ◽  
Soil Moisture Content ◽  
Shallow Landslide ◽  
Landslide Stability ◽  
Function Relationship

Heavy rainfall has important implications to shallow landslide stability. In the paper, the relationship between the soil moisture content and soil shear strength and between surface displacements of landslide and rainfall were studied. Their statistical relationships were established. Relationship between soil moisture content and shear strength should be fitted using the logarithmic function. Relationship between soil slope and rainfall displacement should adopt the power function fit. Constitutive model of catastrophe theory of heavy rainfall landslides stability was known, which it is very important to provide a theoretical basis for prediction.

Impacts of soil moisture content and vegetation on shear strength of unsaturated soil

2005 ◽  
Vol 10 (4) ◽  
pp. 682-688 ◽  
Author(s):  
Yang Yong-hong ◽  
Zhang Jian-guo ◽  
Zhang Jian-hui ◽  
Liu Shu-zhen ◽  
Wang Cheng-hua ◽  
...  
Keyword(s):  
Shear Strength ◽  
Soil Moisture ◽  
Moisture Content ◽  
Unsaturated Soil ◽  
Soil Moisture Content

Energetic relationships for crushing of soil clods

2006 ◽  
Vol 2 (1) ◽  
pp. 51-72
Author(s):  
István Patay ◽  
Virág Sándor
Keyword(s):  
Moisture Content ◽  
Specific Energy ◽  
Soil Moisture Content ◽  
Energy Requirement ◽  
Clay Content ◽  
Clay Soils ◽  
Rigid Support ◽  
Soil Plasticity ◽  
Specific Energy Requirement ◽  
The Relationship

Clod crushing is a principal problem with soils of high clay content. Therefore, there is a need for determining the conditions for clod breaking and clod crushing. The objective of the work was to develop a special purpose tool for single clod breaking both by rigid support of the clod and by a single clod supported by soil and to develop a machine for clod crushing. Furthermore, the purpose was to determine the relationship between the specific energy requirement for clod crushing in the function of soil plasticity and the soil moisture content by the means of the developed tool and machine. The main result of the experiments is summarized in a 3D diagram where the specific energy requirement for soil clod crushing is given in the function of the moisture content and the plasticity index for different clay soils.

Analysis on Soil Moisture Content in the Middle Reaches of the Yellow River

2011 ◽  
Vol 28 (1) ◽  
pp. 85-91 ◽  
Author(s):  
Run-chun LI ◽  
Xiu-zhi ZHANG ◽  
Li-hua WANG ◽  
Xin-yan LV ◽  
Yuan GAO
Keyword(s):  
Soil Moisture ◽  
Moisture Content ◽  
Soil Moisture Content ◽  
Yellow River ◽  
The Yellow River
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