scholarly journals Distribution Pattern of Anchorage Stress and Water Sensitivity Analysis of Red Clay

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Lifeng Li ◽  
Weili Gong ◽  
Huilin Deng ◽  
Xiaohu Zhang ◽  
Gan Li
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Distribution Pattern ◽  
Water Content ◽  
Exponential Distribution ◽  
Red Clay ◽  
Anchor Cable ◽  
Water Sensitivity ◽  
The Relationship ◽  
Single Exponential

Red clay is a special soil layer with complex engineering properties distributed in tropical and subtropical regions. An anchor cable support is a common form of red clay slope support. The effectiveness of the anchor cable support is mainly determined by the anchoring force provided by the red clay stratum. Increase of the water content will lead to the rapid deterioration of the mechanical properties of red clay, which will lead to the reduction of the anchoring force of the slope anchor cable and lead to the failure of the support. Based on the classical Phillips and uniform anchorage shear stress distribution theory, this paper puts forward a uniform-exponential distribution pattern of anchorage shear stress according to the specific characteristics of red clay by using the characteristics of the peak shear strength and residual shear strength of the rock and soil mass. With increasing anchorage force, the dynamic evolution (single exponential distribution ⟶ double single exponential distribution ⟶ uniform index exponential complex distribution ⟶ uniform distribution) of the anchorage shear stress is analysed. Based on the peak and residual test of the cohesive force and internal friction angle, the relationship between the anchoring force and buried depth and water content is established by analysing the factors influencing the anchoring force. It can be found from the field test that, according to the relationship established, the limit anchorage force of the anchor cable in the red clay stratum can be calculated and the water sensitivity of the anchor cable’s limit anchorage force can be quantitatively analysed.

Characterization of Shear Strength and Interface Friction of Organic Soil

2020 ◽  
Vol 857 ◽  
pp. 203-211
Author(s):  
Majid Hamed ◽  
Waleed S. Sidik ◽  
Hanifi Canakci ◽  
Fatih Celik ◽  
Romel N. Georgees
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Internal Friction ◽  
Moisture Content ◽  
Water Content ◽  
Friction Angle ◽  
Structural Materials ◽  
Organic Soil ◽  
Internal Friction Angle ◽  
Interface Friction

This study was undertaken to investigate some specific problems that limit a safe design and construction of structures on problematic soils. An experimental study was carried out to examine the influence of loading rate and moisture content on shear strength of organic soil. Influece of moisture content on interface friction between organic soil and structural materials was also attempted. A commonly used soil in Iraq was prepared at varying moisture contents of 39%, 57% and 75%. The experimental results showed that the increase in water content will decrease the shear stress and the internal friction angle. An increase of the shearing rate was found to decrease the shear stress and internal friction angle for all percetanges of water contents. Further, direct shear tests were carried out to detect the interface shear stress behavior between organic soil and structural materials. The results revealed that the increase in water content was shown to have significant negetavie effects on the interface internal friction and angle shear strength.

Influence of Matric Suction on Shear Strength Behavior of Unsaturated Silty Sand

2012 ◽  
Vol 446-449 ◽  
pp. 1627-1632
Author(s):  
Qian Dong ◽  
Liu Liu ◽  
Long Hou
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Peak Effect ◽  
Silty Sand ◽  
Direct Shear Tests ◽  
Suction Control ◽  
Two Factors ◽  
The Matrix ◽  
Matrix Suction ◽  
The Relationship

In order to research matrix suction how to influence the shear strengt of unsaturated silty sand. Based on the analysis of the Soil-water characteristic of unsaturated silty sand through pressure plate instrument test,the suction control direct shear tests under the different suction condition of unsaturated silty sand are studied. And then, the microscopic structure of two kinds soil sample with different water content are scanned to analyze the relationship between the matrix suction and the shear strengt of unsaturated silty sand. The results of the research show that unsaturated silty sand different from unsaturated clayey soil.When water content gradually reduce, the soil shear strength of unsaturated silty sand is not always increased with the increase of matrix suction, but there is a "peak effect".The appearance of "peak effect" is due to unsaturated silty sand has own microstructure characteristics.On the other hand, when the moisture content reduction constantly,the existence form of moisture change gradually.The two factors lead to the effect area of matrix suction change constantly,and then influence shear strengt of unsaturated silty sand to appear "peak effect". In addition,the stress environment also can influence contribution degree of matrix suction to the shear strengt of unsaturated silty sand.

Study on the Clay Mechanical Characteristics of “Ripping Up the Bottom” in the Yellow River

2012 ◽  
Vol 212-213 ◽  
pp. 108-112 ◽  
Author(s):  
Wen Sheng Dong ◽  
Xiu Fang Jiang ◽  
Xian Feng He ◽  
Ying Ying Zai
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Mechanical Strength ◽  
Water Content ◽  
Critical Condition ◽  
Mechanical Characteristics ◽  
Yellow River ◽  
The Yellow River ◽  
Dry Density ◽  
The Relationship

Aim to the high sandy river “ripping up the riverbed” phenomenon, by experiment, analyzing the relationship between clay dry density, water content, plasticity index and its shear strength, and its mechanical properties. Create the conditions for studying clay mechanical strength and the critical condition of “bottom tearing scour”.

scholarly journals STUDY ON PERMEABILITY AND ELECTRICAL RESISTIVITY OF RED CLAY CONTAMINATED BY CU2+

2021 ◽  
Vol 30 (1) ◽  
Author(s):  
Rulong Ban ◽  
Xuejun Chen ◽  
Yu Song ◽  
Pengyan Bi ◽  
Xin Yang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Electrical Resistivity ◽  
Hydraulic Conductivity ◽  
Water Content ◽  
Contaminated Soil ◽  
Initial Water Content ◽  
Red Clay ◽  
Initial Water ◽  
Electrode Method ◽  
The Relationship

In order to study the permeability characteristics of heavy metal ions contaminated red clay and explore the rapid detection of permeability of heavy metal contaminated red clay. Through variable-head permeability test and electrical resistivity test (different voltages and methods), the effects of Cu2+ concentration and initial water content on hydraulic conductivity characteristic and resistivity of contaminated red clay was systematically investigated. The relationship between permeability characteristic and electrical resistivity was further explored by taking Cu2+ concentration and moisture content as the intermediate variable. The obtained results indicate that the different voltage has no obvious effect on the resistivity of the samples. The four-phase electrode method is more accurate than the two-phase electrode method. With increasing Cu2+ concentrations the hydraulic conductivity of specimens increases, however the permeability coefficient of contaminated soil decreases with increasing initial water content. In the resistivity test, with increasing of Cu2+ concentrations and water content, the resistivity of samples presented a downward trend, which is decreased sharply at first and then tended to be gentle. The relationship between hydraulic conductivity and resistivity of contaminated soil showed a good fitting curve no matter in different Cu2+ concentration or in different water content, but the fitting curves of them presented opposite trend.

Shear Strength Change of Different Water Content after Thawing Remolded Soil

2012 ◽  
Vol 204-208 ◽  
pp. 334-337
Author(s):  
Wei Jiang ◽  
Bing Xin Gu
Keyword(s):  
Shear Strength ◽  
Water Content ◽  
Room Temperature ◽  
Triaxial Compression ◽  
Shear Strength Parameters ◽  
Strength Change ◽  
Soil Shear Strength ◽  
Set Up ◽  
Relationship Of ◽  
The Relationship

Freeze-thaw made the microstructure of the soil produce a certain degree of damage, which was relevant with the soil water content. 6 kinds of remolded soil of the water content was prepared, at low temperature of freezed, in room temperature of melt, after not consolidated non-drained triaxial compression test, the soil shear strength parameters was determined. The results show: after thawed, soil shear strength had reduced significantly, and water content exerted such a pronounced effect on strength of reducing amplitude. Accordingly, the relationship of shear strength reducing after thawing of remolded soil and the water content was set up preliminarily.

Off-axis tensile strength and evaluation of the in-plane shear strength of paper

Holzforschung ◽  
2014 ◽  
Vol 68 (5) ◽  
pp. 583-590 ◽  
Author(s):  
Hiroshi Yoshihara ◽  
Masahiro Yoshinobu
Keyword(s):  
Tensile Strength ◽  
Shear Stress ◽  
Shear Strength ◽  
Stress Component ◽  
Shear Stress Component ◽  
Plane Shear ◽  
Dog Bone ◽  
Paper Filter ◽  
Failure Conditions ◽  
The Relationship

Abstract The off-axis tensile strength (OATS) of copy paper, filter paper, and sack paper was obtained from dog-bone specimens. The relationship between OATS and the off-axis angle (OAA) was predicted under several failure conditions. Additionally, the shear strengths (SS) of these papers were evaluated based on the results of OAT tests. The OATS could be accurately predicted under several Hill-type failure conditions. An equation for deriving the in-plane SS of these papers was proposed based on the tensile strength of the specimen with a 35° OAA, in which the contribution of the shear stress component was maximum.

Shear Test on Mixed Slide-Zone Soils of Landslide under Different Water Content

2011 ◽  
Vol 301-303 ◽  
pp. 1208-1213
Author(s):  
Ting Kai Nian ◽  
Zhong Kai Feng ◽  
Peng Cheng Yu ◽  
Hui Jun Wu
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Water Content ◽  
Strain Softening ◽  
Residual Soil ◽  
Strain Behavior ◽  
Softening Behavior ◽  
Direct Shear Apparatus ◽  
Slide Zone ◽  
Peak Value

This study is based on a typical residual soil landslide adjacent to Daxishan Reservior in Dalian city of China. By drilling the original samples in the field and remodeling the copy samples in the laboratory, a series of geotechnical experiments are carried out by the improved direct shear apparatus to obtain the changing law between the shear strength and water content of the mixed slide-zone soils. Emphasis is given on the shear stress-strain behavior and the corresponding constitutive model under different water content for the soils. Especially, the typical fitting equation is achieved to reflect the state of shear stress-normal stress-water content, some strain softening and hardening behavior on the mixed slide-zone soils of landslide is also discussed in detail. The results indicate that the shear strength is significantly related to water content of mixed slide-zone soils of landslide. The bigger water content of slide-zone soil is, the smaller the shear strength of soils is. When water content of mixed slide-zone soils approaches to certain value (i.e., 15%), the curve of shear stress and displacement shows a remarkable softening behavior, and the shear strength has marked a peak value.

scholarly journals DETERMINATION OF DEPENDENCE OF WOOD BIOMASS DISINTEGRATION PARAMETERS ON WATER CONTENT

2018 ◽  
Author(s):  
Jiří SOUČEK ◽  
Algirdas JASINSKAS
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
Shear Strength ◽  
Water Content ◽  
Energy Use ◽  
Poplar Wood ◽  
Wood Biomass ◽  
Wood Processing ◽  
Strength Limit

Mechanical properties of wood are an important aspect in its processing. Wood is traditionally used for construction and technical purposes. Recently, its importance has grown in energy use. For energy use, it is necessary to modify the wood dimensionally into the desired shape. Therefore, the disintegration is an important operation in wood processing. Its difficulty depends on the properties of the wood. The authors have determined the parameters of energy-using wood species on a water content in the range of 0-50%. The observed properties were wood shear stress. With decreasing water content, the shear stress of wood decreases. The shear strength limit of poplar wood increased from 22.3 MPa to 30.2 MPa. Poplar samples had a higher shear strength than willow samples.

Sign in / Sign up

Export Citation Format

Share Document