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.

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.

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.

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.

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.

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.

Shear strength testing of intact and recompacted samples of municipal solid waste

2009 ◽  
Vol 46 (10) ◽  
pp. 1133-1145 ◽  
Author(s):  
Manoj K. Singh ◽  
Jitendra S. Sharma ◽  
Ian R. Fleming
Keyword(s):  
Shear Strength ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Effective Stress ◽  
Deformation Behaviour ◽  
Triaxial Compression ◽  
Large Diameter ◽  
Shear Behaviour ◽  
Triaxial Tests ◽  
Strength Testing

This paper presents results of shear strength testing of intact and recompacted samples of municipal solid waste (MSW). A method for in situ sampling of MSW from landfills using a push-in sampler was developed and used to obtain intact samples of MSW from a large municipal landfill. Shear strength testing of MSW was carried out using a large triaxial compression apparatus as well as a large direct shear apparatus. The results are presented in terms of cohesion intercept (c′) and angle of shearing resistance ([Formula: see text]) and are compared with those available in published literature. Based on these results and their favourable comparison with this literature, it can be concluded that meaningful shear strength parameters for MSW can be obtained using consolidated undrained triaxial tests on large-diameter intact and recompacted samples. A fairly consistent picture of the shear behaviour of MSW obtained from effective stress paths in triaxial tests appears to suggest that shear behaviour of MSW can be explained using the effective stress principle. It is suggested that recompacted samples could be used for obtaining reasonable estimates of c′ and [Formula: see text] for MSW; however, it may be necessary to use intact samples to establish the pre-failure deformation behaviour of MSW.

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