use the attached graph paper) A series of direct shear tests was performed on a soil sample. Each test was carried out until the specimen sheared (failed). The laboratory data for the tests are tabulated as follows. Determine the soil's cohesion and angle of internal friction. Specimen Number 1 2 3 4 Normal Stress (kN/m²) 1200 1900 3000 4875 Shearing Stress (kN/m²) 2175 2310 2910 3615

use the attached graph paper) A series of direct shear tests was performed on a soil sample. Each test was carried out until the specimen sheared (failed). The laboratory data for the tests are tabulated as follows. Determine the soil's cohesion and angle of internal friction. Specimen Number 1 2 3 4 Normal Stress (kN/m²) 1200 1900 3000 4875 Shearing Stress (kN/m²) 2175 2310 2910 3615

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Test for Determination of Shear Strength

The term shear strength is often associated with the soil. Shear strength is defined as the resistance to the deformation of soil particles due to the continuous action of shear stress. In short, shear strength is the maximum shear stress that a soil can sustain.

Question

use the attached graph paper)
A series of direct shear tests was performed on a soil sample. Each test was carried out until the specimen
sheared (failed). The laboratory data for the tests are tabulated as follows. Determine the soil's cohesion
and angle of internal friction.
Specimen Number
1
2
3
4
Normal Stress (kN/m²)
1200
1900
3000
4875
Shearing Stress (kN/m²)
2175
2310
2910
3615

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Assume that both a triaxial shear test and a direct shear test are to be performed on a sample of dry sand. When the triaxial shear test is performed, the specimen fails when the major and minor principal stresses are 80 and 20 lbs/in^2, respectively. When the direct shear test is performed, what shear strength can be expected if the normal stress is 4000 lbs/ft^2? Show all work.
Soil mechanics
A series of direct shear tests were conducted on a sample of soil in a 60 mm square shear box. The table below shows the results that were obtained at failure. Plot the graph of shear stress at failure against normal stress anddetermine the strength parameters of the soil. Normal Load (N) 200 300 400 Shear Load (N) 105 142 180
x 18 The effective shear strength equation (S = T₁ = 25+5 tam 30); expressed for a saturated clayey soil. In undrained test on a sample of the same soil using the shear box apparatus, the following data at failure were recorded :. Shear Stress = 90 kPa a) What and Normal stress = 180 kPa pore water pressure in the specimen at time of was the failure (assume Øu= 0). Find the Unconfined compressive strength (Od max) for the same soil an Unconfined. when tested in Compression test. c) Find the major principal stress when a sample of the same soil is tested in Ul test with confining pressure of (200 kPa).
In Triaxial test, which of the following parameters do not need to be recorded the confining pressure specimen diameter changes ) the generated pore pressure the axial force A Triaxial test was performed on a dry, cohesionless soil. If the sample failed vhen the minor principal stress was half of the major principal stress, the soil's angle of internal friction is: O 22.5 19.5 33.3 O 25 A technician obtained a soil void ratio of 1.5. It is okay because it is possible to measure void ratio values above 1. True False |
Soil sample size is (21cm×21cm)
a. A shear box test carried out on a soil sample gave the following results ✓ Vertical load [kg] 36.8 73.6 110.4 147.2 Gauge reading for proving 16 26 35 44 (shearing) ring [μm] If the shear box is 60 mm square and the proving ring constant/factor is 20 N/μm, determine the apparent cohesion and angle of internal friction for this soil. HINT: Determine normal stress from vertical load readings and shear stress from proving ring readings