The Large-Scale Direct Shear Test on Gravel Soil with Different Water Content in Badong of Three Gorges Reservoir Region

2011 ◽  
Vol 243-249 ◽  
pp. 2035-2038 ◽  
Author(s):  
Le Hua Wang ◽  
Jia Cheng Wang ◽  
Jian Lin Li
Keyword(s):  
Water Content ◽  
Three Gorges Reservoir ◽  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear ◽  
Cut Slope ◽  
Three Gorges ◽  
Gravel Soil ◽  
The Impact

The high cut slope of reservoir-bank road and city buildings are mostly earth-rock mixture after excavation. The strength behavior of the gravelly soil is important for mechanism of landslide triggering and soil erosion in Badong high cut slope. With the impact of rainfall, the water content of gravel soil increases, and the water table changes, this eventually affects the mechanical properties of gravel soils. Taking high cut slope which formed in the course of relocation in Three Gorges Reservoir as its background, the paper selected the gravel soil of typical high cut slope in Badong new town; and through on-site survey, analysis of geological conditions, indoor large-scale direct shear test, combined with laboratory test results, it discussed the influence of high cut slope gravel soil shear strength parameters by different water content of sample. At the end of this paper, it draws some beneficial conclusions.

scholarly journals Shear strength characteristics of Jerash expansive soil

2021 ◽  
Vol 3 (2) ◽  
pp. 74-80
Author(s):  
Talal Masoud
Keyword(s):  
Shear Strength ◽  
Internal Friction ◽  
Water Content ◽  
Direct Shear Test ◽  
Shear Test ◽  
Expansive Soil ◽  
Content Increase ◽  
Direct Shear ◽  
Initial Water ◽  
Angle Of Internal Friction

The results of the direct shear test on Jerash expansive soil show the effect of the initial water content on the cohesion (c) and on the angel of internal friction ( ) [shear strength parameters].it show that, as the initial water increase, the cohesion (c) of Jerash expansive soil also increase up to the shrinkage limit, after that increase of water even small amount, decrease the cohesion of the soil. On the other hand, the results of direct shear test show also  that as the water content increase, the angle of internal friction ( )remain unchanged up to shrinkage limit , any increase of water cause a large decrease on the angle of internal friction of Jerash expansive soil.

scholarly journals Influence of Maximum Particle Diameter on the Mechanical Behavior of Soil-Rock Mixtures

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Zhuoling He ◽  
Junyun Zhang ◽  
Tao Sun
Keyword(s):  
Shear Strength ◽  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Particle Diameter ◽  
Size Difference ◽  
Direct Shear ◽  
Fine Grained ◽  
Fine Grained Soil ◽  
Maximum Particle

With the steady development of the development of the western region in China, the construction of mountain highways has developed rapidly, and the soil-rock mixed filler, as an excellent filler, is widely used in the subgrade filling of mountain highways. Unlike ordinary fine-grained soil, the source of the soil-rock mixtures (S-RMs) is not unique, and the particle size difference is large and the water content is not uniform, resulting in very complicated mechanical properties. But the current highway embankment codes are still mainly established on the fine-grained soil. It is not fully applicable to soil-rock filled embankment. Based on soil-rock filled embankment engineering practice, this research uses a large-scale direct shear test to research the mechanical characteristics of the S-RMs with different maximum particle diameters. According to the large-scale direct shear test of S-RMs with different maximum particle diameters, the shear displacement vs shear stress curve, shear dilation, and strength characteristics with maximum particle diameter were analyzed. Results demonstrate that whether secondary hardening occurs mainly depends on the normal stress and the maximum particle diameter of the filler. At different maximum particle diameters, the horizontal displacement vs vertical displacement curves of the S-RMs can be roughly divided into continuous shearing and beginning of shearing and quick dilation. And the shear strength increases with the increase of the maximum particle diameter. Moreover, the cohesion decreases first and then increases with the increase of the maximum particle diameter, and the internal friction angle increases with the increase of the maximum particle diameter. Therefore, some RBs with large particle diameter added to filler can effectively improve the shear strength of the S-RMs, which may be valuable for realistic engineering.

scholarly journals Determining the Shear Strength Properties of a Soil-geogrid Interface Using a Large-scale Direct Shear Test Apparatus

2020 ◽  
Author(s):  
Jakub Stacho ◽  
Monika Sulovska ◽  
Ivan Slavik
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Strength Properties ◽  
Coarse Grained ◽  
Direct Shear ◽  
Test Apparatus ◽  
Fine Gravel

The paper deals with the laboratory testing of coarse-grained soils that are reinforced using a geogrid. The shear strength properties were determined using a large-scale direct shear test apparatus. The tests were executed on original as well as on reinforced soil, when the geogrid was placed on a sliding surface, which permitted determining the shear strength properties of the soil-geogrid interface. The aim of the tests was to determine the interface shear strength coefficient α, which represents the ratio of the shear strength of the soil-geogrid interface to the unreinforced soil. The tests were executed on 3 samples of coarse-grained materials, i.e., poorly graded sand, poorly graded fine gravel and poorly graded medium gravel. Two types of geogrids were tested, i.e., a woven polyester geogrid and a stiff polypropylene geogrid. The results of the laboratory tests on the medium gravel showed that the reduction coefficient α reached higher values in the case of the stiff polypropylene geogrid. In the cases of the fine gravel and sand, the values of the interface coefficient α were similar to each other. The shear strength of the interface was reduced or was similar to the shear strength of unreinforced soil in a peak shear stress state, but significantly increased with horizontal deformations, especially for the fine gravel and sand. The largest value of the coefficient α was measured in the critical shear stress state. Based on the results of the testing, a correlation which allows for determining the optimal grain size distribution was obtained.

scholarly journals Effect of Rock Particle Content on the Mechanical Behavior of a Soil-Rock Mixture (SRM) via Large-Scale Direct Shear Test

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Longqi Liu ◽  
Xuesong Mao ◽  
Yajun Xiao ◽  
Qian Wu ◽  
Ke Tang ◽  
...  
Keyword(s):  
Shear Strength ◽  
Normal Stress ◽  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Volumetric Strain ◽  
Direct Shear ◽  
Stress Strain ◽  
Particle Content ◽  
Rock Particle

The mechanical strength of the landslide deposits directly affects the safety and operation of the roads in the western mountainous area of China. Therefore, the research is aimed at studying the mechanisms of a landslide deposit sample with different rock particle contents by analyzing its characteristics of the stress-strain behavior, the “jumping” phenomenon, the volumetric strain, and the shear strength parameters via a large-scale direct shear test. Stress-strain results show that stress-strain curves can be divided into 3 different stages: liner elastic stage, yielding stage, and strain-hardening stage. The shear strength of SRM behaves more like “soil” at a lower rock particle content and behaves more like “rock joints” at a higher rock particle content. Characteristics of the “jumping” phenomenon results show that the “intense jumping” stage becomes obvious with the increasing rock particle content and the normal stress. However, the lower the rock particle content is, the more obvious the “jumping” phenomenon under the same normal stress is. Volumetric strain results show that the sample with a lower rock particle content showed a dilatancy behavior under the low normal stress and shrinkage behavior under the high normal stress. The dilatancy value becomes smaller with the increasing normal stress. The maximum shear stress value of the rock particle content corresponds to the maximum value of dilatancy or shrinkage. We also conclude that the intercept of the Mohr failure envelope of the soil-rock mixture should be called the “equivalent cohesion,” not simply called the “cohesion.” The higher the normal stress and rock particle content are, the bigger the equivalent cohesion and the internal friction angle is.

Experimental and Numerical Evaluation of the Parameters Influencing the Shear-Stress Behavior of Interlocking Paver Blocks–Bedding Sand Interface Using Large-Scale Direct Shear Test

2021 ◽  
Vol 33 (6) ◽  
pp. 04021104
Author(s):  
Arjun Siva Rathan Raveendran Thulasibai ◽  
Sunitha Velayudhan ◽  
Murshida Pathath ◽  
Janani Lekshmipathy ◽  
Anusudha Visvanathan
Keyword(s):  
Shear Stress ◽  
Numerical Evaluation ◽  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear ◽  
Stress Behavior

scholarly journals This issue of Earth Science Research Journal

2017 ◽  
Vol 21 (4) ◽  
pp. 157
Author(s):  
Germán A. Prieto G.
Keyword(s):  
Earth Sciences ◽  
Water Content ◽  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear ◽  
The South ◽  
Cyclone Activity ◽  
Research Journal ◽  
The Earth ◽  
Loess Deposits

We at the Earth Sciences Research Journal hope all our readers have a happy and productive 2018. Our last issue of ESRJ in 2017 presents a number of papers on different topics within the Earth Sciences. In Alvarez-Ysabel et al. a 150+ year database of tropical cyclone activity is analyzed for the Dominican Republic (DR). A total of 112 events have tracks at most 300 km from the DR are studied in terms of their seasonal distribution and long-term distribution, their frequency and landfall probability. The authors also present a review of trocial cyclone activity in the region. Ogly Gahramanov uses a combination of geological and geochemical information to model the formation of hydrocarbon deposits in the South Caspian Basin, in particular for the South Caspian Depression. The authors argue that large pressures and tectonic history have a large effect on the appropriate selection of potential drilling sites. Using high-resolution aeromagnetic survey data in combination with other geological-geophysical thematic maps,  XXXX.et al. take advantage of GIS tools for identifying different tectonic regimes in the Sabinas Basin, northeastern Mexico.   Regions where the basin is deepest and the delineation of faults allows for the determination of block boundaries as well. He et al. use a modified direct shear test apparatus to determine shear strength parameters of unsaturated soils under various conditions. The paper proposes that the direct shear test analysis is an efficient way to analysis soil samples. Zhuo and Chen explore the improved water retention capacity of sandy soils by adding nanocarbon made from coconut shells. Different amounts and thicknesses of nanocarbon were added to the soil, increasing water content with increased nanocarbon. Loess deposits can have very large thicknesses, and for engineering purposes it is important to better understand the geotechnical response of the loess deposits. Wang et al. investigate the collapsibility of loess deposits in the Xixian New Region using compressions tests under different pressure and water content conditions. Results presented may have important application in future geotechnical studies in the region.  

scholarly journals Study on Shear Properties of the Soil-rock Mixture

2020 ◽  
Vol 165 ◽  
pp. 04079
Author(s):  
B Li
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Friction Angle ◽  
Direct Shear ◽  
Shear Properties ◽  
Maximum Particle Size ◽  
Maximum Particle

In order to study the shear properties of the soil-rock mixture, a large-scale indoor direct shear test is used to test the shear strength (τ) of SRM under different positive pressures, and calculates the internal friction angle (φ) and cohesive force (c) according to the molar theory. The effects of soil-rock ratio, gradation, maximum particle size, moisture content, and compaction on the shear properties of the soil-rock mixtures are studied. The results show that as the soil-rock ratio decreases, the τ and φ of the SRM increase, while the c increases first and then decreases, and reaches the maximum peak when the soil-rack ratio is 40:60. As the maximum particle size increases, the τ and φ of the SRM increase, while the c decreases. With the increase of the moisture content, the τ, φ and c of the SRM all increase first and then decrease, and reach the maximum peaks when the moisture content is 10.5%, 10%, and 12%, respectively. With the increase of compaction, the τ, φ and c of SRM all increase. The effect of gradation on τ, φ and c is small.

scholarly journals Assessment of Interface Shear Behaviour of Sub-ballast with Geosynthetics by Large-scale Direct Shear Test

2016 ◽  
Vol 143 ◽  
pp. 1007-1015 ◽  
Author(s):  
M. Mahdi Biabani ◽  
Buddhima Indraratna ◽  
Sanjay Nimbalkar
Keyword(s):  
Large Scale ◽  
Direct Shear Test ◽  
Shear Test ◽  
Shear Behaviour ◽  
Direct Shear ◽  
Interface Shear
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