ECE 2311 SOIL MECHANICS II batch ONE DeKUT.pdf

ECE 2311 SOIL MECHANICS II batch ONE DeKUT.pdf - ECE2311...

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ECE2311 Soil Mechanics II DeKUT-CIVIL Tulatia Mungathia©2013 Page 1 ECE 2311: SOIL MECHANICS II COURSE OUTLINE: 1. Shear strength - Principal planes and stresses - Morhr’s circle - Mohr-coulombs failure theory Shear strength tests - Direct shear tests - Triaxial shear strength tests 2. Stability of slopes - Stress and stability analysis 3. Soil stabilization - Mechanical and chemical methods 4. Site investigations - Reconnaissance - Sampling - Field tests REFERENCES 1. Mohr circles, stress paths and geotecchnics by R.H.G Parry 2. Basic and applied soil mechanics by G. Ranjan & A.S.R Rao 3. Elements of soil mechanics by G.N Smith 4. Solving problems in soil mechanics by H.C Sultaon 5. Soil Mechanics by F.F Craig 6. Hand book of soil mechanics: Soil testing by Arpad Kezdi
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ECE2311 Soil Mechanics II DeKUT-CIVIL Tulatia Mungathia©2013 Page 2 CHAPTER I SHEAR STRENGTH OF SOILS Introduction - Shear strength is a term used in soil mechanics to describe the magnitude of the shear stress that a soil can sustain. The shear resistance of soil is a result of friction and interlocking of particles, and possibly cementation or bonding at particle contacts. - Soil shear strength is a term used to describe the maximum strength of soil at which point significant plastic deformation or yielding occurs. - It is the property that enables a material to remain in equilibrium when its surface is not level - Soils in liquid form have virtually no shear strength and even when solid have shear strengths of relatively small magnitudes compared to those exhibited by steel or concrete. - The ability of a soil mass to support an imposed loading or for a soil mass to support itself is governed by the shear strength of the soil. As a result, the shearing strength of the soil becomes of primary importance in foundation design, highway and lateral earth pressure problems that deals with forces exerted on underground walls, retaining walls, bulkheads and excavations bracing. - In the study of soil shear strength, two major categories of soil types are considered. The soil types are cohesionless and cohesive soils - Overall, the factors that affect the shearing strength of both soil types are the same. However practically, the factors that have the most influence on the shearing strength that is or will be developed by each soil type are different. FACTORS WHICH CONTROL SHEAR STRENGTH OF SOILS The stress-strain relationship of soils, and therefore the shearing strength, is affected (Poulos 1989) by: 1. Soil composition (basic soil material) : mineralogy, grain size and grain size distribution, shape of particles, pore fluid type and content, ions on grain and in pore fluid. 2. State (initial) : Defined by the initial void ratio, effective normal stress and shear stress (stress history). State can be described by terms such as: loose, dense, overconsolidated, normally consolidated, stiff, soft, contractive, dilative, etc.
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ECE2311 Soil Mechanics II DeKUT-CIVIL Tulatia Mungathia©2013 Page 3 3. Structure: Refers to the arrangement of particles within the soil mass; the manner the particles are packed or distributed. Features such as layers, joints, fissures, slickensides, voids, pockets,
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