Test 4 Flashcards
What does Direct Shear Test give you?
Cohesion, Angle of Internal Friction, Q Ultimate, Q Allowable, Bearing Capacity
What does UCC give you?
Unconfined Compressive Strength, Cohesion, Bearing Capacity
What does CBR give you?
CBR number and Hardness of soil.
What does Consolidation give you?
Cv (Coefficient of consolidation), e-log p curve (Amount of consolidation settlement), cv-log p curve (Timing of consolidation settlement) , Cc (Compression index). Determining Settlement of a structure.
What does Permeability give you?
k (Coefficient of permeability), Flow of water through soil
What does Nucleodensometer give you?
Density and Moisture Content. Evaluating compaction on site
What does Triaxial Test give you?
Sigma 1 (Major Principal Stress), Sigma 3 (Minor Principal Stress), Cohesion, Angle of Internal Friction, Coefficient of Permeability. Gives Bearing capacity and permeability
What tests can we do on a disturbed sample?
CBR, Moisture Content, Sieve Analysis, Maximum Density (Proctor Test)
What tests can we do on a undisturbed sample?
UCC, Consolidation, Direct Shear, Triaxial, Permeability (if possible)
What tests can we do on a normally consolidated sample?
Consolidation test
What tests can we do on a overconsolidated sample?
Triaxial Shear Test, Nucleodensomter Test
What tests can we do on both?
UCC, Direct Shear, CBR, Permeability
Scenario 1: Highway Construction on Normally Consolidated Clay Soil
Type of Soil: Normally consolidated cohesive soil, such as clay
Tests: Consolidation Test, Triaxial Shear Test, California Bearing Ratio Test
Explanation: Normally consolidated clay soils are common and have predictable behaviors. The Consolidation Test is crucial here to understand how the soil consolidates over time, aiding in designing foundations to prevent excessive settlement. Triaxial Shear Tests assess the shear strength of the soil under different stress conditions, guiding construction methods to ensure stability. The California Bearing Ratio Test helps determine the load-bearing capacity of the soil, essential for road pavement design to withstand traffic loads.c
Scenario 2: Foundation Construction on Non-Cohesive Sand Soil
Type of Soil: Non-cohesive soil, like sandy deposits
Tests: Permeability Test, Direct Shear Test
Explanation: Non-cohesive soils like sand present challenges due to their tendency to shift. The Permeability Test assesses how easily water flows through the soil, guiding drainage design to prevent water-related issues. Direct Shear Tests evaluate the soil’s response to lateral loads, crucial for designing stable foundations or retaining walls. In addition, the Plate Load Test is used to determine the load-bearing capacity of the soil, providing essential information for the design and construction of foundations in sandy soil.
Scenario 3: Road Expansion on Overconsolidated Gravel Soil
Type of Soil: Overconsolidated non-cohesive soil, like gravel
Tests: Triaxial Shear Test, Nucleodensometer Test
Explanation: Overconsolidated gravel soil might have undergone significant stress. Triaxial Shear Tests assess its strength under varying stress conditions, aiding in designing stable roads. The Nucleodensometer Test measures in-situ density, essential for evaluating compaction during construction, ensuring a stable base for the road expansion.
Each test plays a vital role in understanding soil behavior and guiding engineers in making informed decisions crucial for road or building construction in different soil conditions.
