Study on the Properties of Natural Shear Strength for Municipal Solid Waste

2011 ◽  
Vol 48-49 ◽  
pp. 1191-1197
Author(s):  
Zhen Ying Zhang ◽  
Da Zhi Wu
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Internal Friction ◽  
Municipal Solid Waste ◽  
Shear Strain ◽  
Solid Waste ◽  
Test Specimen ◽  
Void Ratio ◽  
Friction Angle ◽  
Initial Void Ratio

The Properties of natural shear strength for municipal solid waste are studied by applying a new developed direct shear testing instrument. The municipal solid waste is divided into three parts: incompressible solid waste, reinforced material that is difficult to be biodegraded and the material that is easy to be biodegraded. The properties of these three parts are 15%, 5% and 80%, respectively. A series of laboratory tests have been conducted for different initial void ratio, and different pressure applied on the test specimen. The testing results show that the initial void ratio is a key factor for the natural shear strength of the municipal solid waste, the relationship between the shear stress and the shear strain is a strain hardening curve, the shear stress gradually increases with the shear strain. Besides, the natural shear strength shows a linear relationship to the pressure applied on the test specimen, and it is in accordance with the law of coulomb. According to the fitted lines, the shear strength parameters are obtained. The cohesion varies from 4.7 to 12.6kPa, and the internal friction angle varies from 14.5 to 18.3 degree for the shear strain is equal to 5%. When the shear strain is equal to 20%, the cohesion varies from 8.5 to 17.2kPa, and the internal friction angle varies from 25.5 to 30.7 degree.

Study on the Shear Strength Parameters for Municipal Solid Waste with Higher Content of Organic Matter

2011 ◽  
Vol 295-297 ◽  
pp. 454-459 ◽  
Author(s):  
Zhen Ying Zhang ◽  
Da Zhi Wu
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Test Specimen ◽  
Void Ratio ◽  
Direct Shear ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
Initial Void Ratio

Basing on the new developed direct shear testing instrument and the tri-axial test instrument with large scale specimen, the shear strength parameters of municipal solid waste has been studied. The municipal solid waste is divided into three parts: the material that is easy to be biodegraded, reinforced material that is difficult to be biodegraded and the incompressible solid waste material. The proportions of these three parts are selected as 80%, 5% and 15%, respectively. A series of laboratory tests have been performed for different initial void ratios, different vertical pressures and different confining pressures applied on the test specimen. Testing results show that the initial void ratio is the main influence factor for the shear strength parameters of the municipal solid waste, the relationship between the shear stress and the shear strain is a strain hardening curve, the shear stress increases gradually with the shear strain. Besides, the principle effective stress increases with the axial strain and the confining pressure in a hardening increasing trend, and the principle effective stress decreases with the increase of the initial void ratio of the municipal solid waste. The shear strength shows a linear relationship to the vertical pressure applied on the test specimen, and it is in accordance with the law of coulomb. According to the testing results of the direct shear test and the tri-axial test, the shear strength parameters are obtained. The cohesion varies from 4.7 to 12.2kPa, and the internal friction angle varies from 14.5 to 28.2 degree.

Study on the Biodegradation Strength Properties for Municipal Solid Waste with Higher Content of Organic Matter

2011 ◽  
Vol 71-78 ◽  
pp. 918-922
Author(s):  
Zhen Ying Zhang ◽  
Da Zhi Wu
Keyword(s):  
Shear Stress ◽  
Organic Matter ◽  
Shear Strength ◽  
Municipal Solid Waste ◽  
Shear Strain ◽  
Solid Waste ◽  
Test Specimen ◽  
Influence Factor ◽  
Strength Properties ◽  
Strength Parameters

Basing on the new developed direct shear testing instrument, the biodegradation strength properties and strength parameters of municipal solid waste with higher content of organic matter have been studied. The municipal solid waste is divided into three parts: the material that is easy to be biodegraded, reinforced material that is difficult to be biodegraded and the incompressible solid waste material. The proportions of these three parts are 80%, 5% and 15%, respectively. A series of laboratory tests have been performed for different initial void ratios and different vertical pressures applied on the test specimen. Testing results show that the initial void ratio is the main influence factor for the biodegradation strength of the municipal solid waste, the relationship between the biodegradation shear stress and the shear strain is a strain hardening curve, the biodegradation shear stress gradually increases with the shear strain. Besides, the biodegradation shear strength shows a linear relationship to the vertical pressure applied on the test specimen, and it is in accordance with the law of coulomb. According to the testing results, the biodegradation shear strength parameters of municipal solid waste are obtained. The cohesion varies from 11.5 to 24.0kPa, and the internal friction angle varies from 8.3 to 29.0 degree.

Experimental Study on the Shear Strength Characteristics of Municipal Solid Waste

2011 ◽  
Vol 219-220 ◽  
pp. 660-664 ◽  
Author(s):  
Zhen Ying Zhang ◽  
Da Zhi Wu
Keyword(s):  
Shear Strength ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Effective Stress ◽  
Large Scale ◽  
Void Ratio ◽  
Influence Factor ◽  
Axial Strain ◽  
Strength Characteristics ◽  
Initial Void Ratio

Basing on the traditional tri-axial test instrument with large scale specimen, the shear strength characteristics of municipal solid waste has been studied. The municipal solid waste is divided into three parts: the material that is easy to be biodegraded, reinforced material that is difficult to be biodegraded and the incompressible solid waste material. Two different proportions of these three parts, which are 50%, 15%, 35% and 65%, 10%, 25% is selected. A series of laboratory tests have been performed for different proportion of ingredients, different initial void ratios and different confining pressures. Testing results show that the initial void ratio and the proportion of ingredients are the main influence factor for the shear strength of the municipal solid waste. Besides, the principle effective stress increases with the axial strain and the confining pressure in a hardening increasing trend, and the principle effective stress decreases with the increase of the initial void ratio of the municipal solid waste.

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.

The Duncan-Chang Model Parameters for Municipal Solid Waste

2011 ◽  
Vol 48-49 ◽  
pp. 1235-1240
Author(s):  
Zhen Ying Zhang ◽  
Da Zhi Wu
Keyword(s):  
Theoretical Analysis ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Void Ratio ◽  
Practical Method ◽  
Model Parameters ◽  
Mechanical Parameters ◽  
Initial Void Ratio ◽  
The Relationship ◽  
Chang Model

By theoretical analysis and laboratory test, the model parameters of Duncan-Chang for municipal solid waste have been studied. To obtain the mechanical parameters, a new simple and practical method has been established. Research results show that the damage ratio is 0.6, parameter n is about 1.05, parameter F varies between 0 and 0.1, and parameter G varies between 0.3 and 0.4. Besides, the relationship between parameter k and the initial void ratio is linear, and the slope of the line is 5.0.

scholarly journals Shear Testing of the Interfacial Friction Between an HDPE Geomembrane and Solid Waste

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1672
Author(s):  
Luming Zhou ◽  
Zhende Zhu ◽  
Zhenpeng Yu ◽  
Cong Zhang
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Solid Waste ◽  
Rough Surface ◽  
Interfacial Shear Strength ◽  
Friction Angle ◽  
Interfacial Shear ◽  
Solid Wastes ◽  
Interfacial Friction ◽  
Industrial Solid Waste

High-density polyethylene (HDPE) geomembrane is often used as an anti-seepage material in domestic and industrial solid waste landfills. To study the interfacial shear strength between the HDPE anti-seepage geomembrane and various solid wastes, we performed direct shear tests on the contact interface between nine types of industrial solid waste or soil (desulfurization gypsum, fly ash, red mud, mercury slag, lead-zinc slag, manganese slag, silica fume, clay and sand) and a geomembrane with a smooth or rough surface in Guizhou Province, China. Friction strength parameters like the interfacial friction angle and the apparent cohesion between the HDPE geomembrane and various solid wastes were measured to analyze the shear strength of the interface between a geomembrane with either a smooth or a rough surface and various solid wastes. The interfacial shear stress between the HDPE geomembrane and the industrial solid waste increased with shear displacement and the slope of the stress-displacement curve decreased gradually. When shear displacement increased to a certain range, the shear stress at the interface remained unchanged. The interfacial shear strength between the geomembrane with a rough surface and the solid waste was higher than for the geomembrane with a smooth surface. Consequentially, the interfacial friction angle for the geomembrane with a rough surface was larger. The geomembrane with a rough surface had a better shear resistance and the shear characteristics fully developed when it was in full contact with the solid waste.

Experimental Study on Dynamic Strength Regional Characteristics of Undisturbed Loess Based on the Mohr-Coulomb Failure Criterion

2013 ◽  
Vol 700 ◽  
pp. 111-118 ◽  
Author(s):  
Ping Wang ◽  
Jun Wang ◽  
Shao Feng Chai ◽  
Nai Wang
Keyword(s):  
Shear Strength ◽  
Internal Friction ◽  
Failure Criterion ◽  
Void Ratio ◽  
Dynamic Strength ◽  
Friction Angle ◽  
Dynamic Shear ◽  
Coulomb Failure ◽  
Coulomb Failure Criterion ◽  
Dynamic Shear Strength

Based on Mohr - Coulomb failure criterion, dynamic strength characteristic of undisturbed loess in Xining, Lanzhou, Xiji and Xian was studied through dynamic triaxial test. And the regional characteristics of void ratio, natural moisture content, plasticity index and dynamic shear strength with different vibration frequency and natural conditions were analyzed. The research shows that dynamic shear strength of loess increases when consolidation stress rises under the same water content condition. However the increase trend is not proportional relationship. Initial void ratio and water content of loess under natural state rises from northwest to southeast, and dynamic cohesive force enhances. On the contrary, internal friction angle decreases with the change of characteristic. With the increasing trend of disturbed loesss clay content from northwest to southeast, dynamic cohesive force increases and internal friction angle decreases in the different amplitude. The conclusion enriches and develops the evaluation theory of loess regional dynamic characteristic and it is a universal method to reduce cost of different loess regional classification.

Study on the Strength Characteristics of Municipal Solid Waste

2011 ◽  
Vol 204-210 ◽  
pp. 1835-1838
Author(s):  
Zhen Ying Zhang ◽  
Da Zhi Wu
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Effective Stress ◽  
Large Scale ◽  
Void Ratio ◽  
Axial Strain ◽  
Confining Pressure ◽  
Strength Characteristics ◽  
Initial Void Ratio ◽  
Confining Pressures

Basing on the traditional tri-axial test on large-scale samples, the strength characteristics of municipal solid waste have been studied. The municipal solid waste is divided into three parts: incompressible solid waste material, reinforced material that is difficult to be biodegraded and the material that is easy to be biodegraded. The proportions of these three parts are 35%, 15% and 50%, respectively. Laboratory test has been performed for different initial void ratios, different proportion of ingredients and different confining pressures. The testing results show that the initial void ratio is the main factor that influences the strength of the municipal solid waste. Besides, the principle effective stress increases with the axial strain in a hardening increasing trend, even though the total axial strain has reached 40%. The principle effective stress also increases with the confining pressure that applied on the testing sample. Furthermore, the principle effective stress decreases with the increasing of the initial void ratio.

The Physical and Mechanic Properties of the Loess Landslide

2012 ◽  
Vol 446-449 ◽  
pp. 3003-3006
Author(s):  
Li Hua Li ◽  
Meng Dang ◽  
Heng Lin Xiao ◽  
Hui Ming Tang
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Internal Friction ◽  
Water Content ◽  
Maximum Shear Stress ◽  
Friction Angle ◽  
Dry Density ◽  
Disaster Prevention ◽  
Loess Landslide ◽  
Landslide Disaster

The loess landslide in BaDong city, HuBei province China suffers great losses, which is an extremely typical landslide disaster. Variation in water level in the Yangtse River and rainfall has enormous influence on the loess landslide disaster. Some tests on loess have been done, which mainly include water content influence on shear strength of the loess, the relation between water content and dry density etc. The results have shown that When the water content average increasing with 3%, the cohesive strength reduces with 57%，49%，54% respectively and the internal friction angle average reduces 43%. The bigger the water content, the bigger the shear displacement at the same imposed load. When water content average increases with 3%, the corresponding maximum shear stress reduces with 50%, which may be in favor of loess landslide disaster prevention.

Experimental Study on the Permeability of Fresh Municipal Solid Waste

2012 ◽  
Vol 599 ◽  
pp. 547-550
Author(s):  
Zhen Ying Zhang ◽  
Da Zhi Wu ◽  
Qi Mao Cai
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Large Scale ◽  
Void Ratio ◽  
Influence Factors ◽  
Waste Material ◽  
Initial Void Ratio ◽  
Coefficient Of Permeability ◽  
Constant Head ◽  
Main Influence

Basing on traditional constant head permeability test with large scale specimen, the permeability of municipal solid waste has been studied. The municipal solid waste material is divided into three parts: the material that is easy to be biodegraded, reinforced material that is difficult to be biodegraded and the incompressible solid waste material. Two different proportions of these three parts, which are 50%, 15%, 35% and 65%, 10%, 25% are selected. A series of laboratory tests have been performed for different initial void ratios, and the initial void ratios are 2.5, 3.0 and 3.5, respectively. Testing results show that the initial void ratio and the content of the organic matter are the main influence factors on the permeability coefficient of the municipal solid waste. Besides, the coefficient of permeability decreases with the decreasement of the initial void ratio of the municipal solid waste. Furthermore, when the proportion of the three parts is 65%, 10% and 25%, the coefficient of permeability varies from 7.8×10-4 to 3.72×10-3 centimeter per second, and when the proportion of three parts is 50%, 15% and 35%, the coefficient of permeability varies from 1.08×10-3 to 6.67×10-3 centimeter per second.

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