A wide range of dynamic and static penetrometers are available, with different types being used in different conditions of sub-strata materials. However, the objective of all probing is the same, namely to provide a profile of penetration resistance with depth, in order to give an assessment of the variability of in-situ materials on site. Probing(…)
GE Lab Tests
GEOTECHNICAL LABORATORY TESTS
Geotechnical Engineering Laboratory Experiments DIFFERENT TYPES OF SHEAR TESTS AND DRAINAGE CONDITIONS The following tests are used to measure the shear strength of the soil Direct shear test Triaxial compression test Unconfined compression test Vane shear test Depending upon the drainage conditions, there are three types of tests Unconsolidated-Undrained condition Consolidated –… (Continue reading) CALIFORNIA(…)
VANE SHEAR TEST ON SOIL
VANE SHEAR TEST ON SOIL The vane shear test apparatus consists of four stainless steel blades fixed at right angle to each other and firmly attached to a high tensile steel rod. The length of the vane is usually kept equal to twice its overall width. The diameters and length of the stainless steel rod(…)
TRIAXIAL SHEAR STRENGTH TEST
TRIAXIAL SHEAR STRENGTH TEST ON SOIL This is the most widely used and is suitable for all types of soils. A cylindrical specimen, generally having a length to diameter ratio of 2, is used in the test and is stressed under conditions of axial symmetry in the manner shown in figure. The specimen is subjected(…)
COMPACTION OF SOIL PROCTOR’S TEST
TO DETERMINE THE COMPACTION CHARACTERISTICS OF A SOIL SPECIMEN BY PROCTOR’S TEST Theory: Compaction is the process of densification of soil by reducing air voids. The degree of compaction of a given soil is measured in terms of its dry density. The dry density is maximum at the optimum water content. A curve is drawn(…)
UNCONFINED COMPRESSIVE STRENGTH OF COHESIVE SOIL
TO DETERMINE THE UNCONFINED COMPRESSIVE STRENGTH OF COHESIVE SOIL Theory: The unconfined compressive strength () is the load per unit area at which the cylindrical specimen of a cohesive soil falls in compression. Where P= axial load at failure, A= corrected area = , where is the initial area of the specimen, = axial strain(…)
SHEAR STRENGTH OF SOIL BY DIRECT SHEAR TEST
TO DETERMINE THE SHEAR STRENGTH OF A SANDY SOIL SPECIMEN BY DIRECT SHEAR TEST Theory: Shear strength of a soil is its maximum resistance to shearing stresses. The shear strength is expressed as Where c’ = effective cohesion, = effective stress, = effective angle of shearing resistance. The shear tests can be conducted under three(…)
CONSOLIDATION TEST OF SOIL
TO DETERMINE THE CONSOLIDATION CHARACTERISTICS OF A SOIL SAMPLE Theory: Consolidation of a saturated soil occurs due to expulsion of water under static, sustained load. The consolidation characteristics of soils are required to predict the magnitude and the rate of settlement. The following characteristics are obtained from the consolidation test. Coefficient of compressibility, Coefficient of(…)