Dynamic probe test is done to determine the penetration resistance of soil. Apparatus required for dynamic probe test of soil are: (a) Dynamic Probe: The anvils shall be rigidly fixed to the guide rod; the lower anvil shall also be rigidly fixed to the extension rods. The mass of the lower anvil shall be 1.5(…)
Soil
MACKINTOSH PROBE TEST
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(…)
QUICK SAND CONDITION
QUICK SAND CONDITION IN COHESIONLESS SOILS The shear strength of cohesionless soil depends upon the effective stress. The shear strength is give by Where = effective stress. = angle of shearing resistance. The effective stress is reduced due to upward movement of flow of water. When the head causing upward flow is increased, a stage(…)
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(…)
SOIL CLASSIFICATION
CLASSIFICATION OF SOIL Classification systems are used to group soils according to their order of performance under given set of physical conditions. Soils that are grouped in order of performance for one set of physical conditions will not necessarily have the same order of performance under some other physical conditions. Therefore, number of classification systems(…)
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(…)