Shear testing is performed using geotechnical testing to determine the shear strength parameters of soils and rock discontinuities under controlled conditions. The test provides key engineering properties, namely cohesion (c) and angle of internal friction (φ), which are essential for the design and stability assessment of foundations, slopes, retaining structures, embankments, and earthworks.

The sample is prepared and placed in a shear chamber where a horizontal force (shear force) is applied to the upper half of the chamber at a constant and controlled displacement rate (e.g., 0.5 mm/min for clay, faster for sand). This is crucial for controlling drainage conditions. Soil cohesion is measured using the Mohr-Coulomb failure criterion, where τf = c + σn tanϕ.

Direct shear testing is commonly applied to coarse-grained soils, sands, gravels, and interfaces, as well as to evaluate the shear behavior of rock joints, geosynthetic interfaces, and soil–structure contacts.

Oedometer consolidation machine works by applying increasing vertical loads using a pressure gauge to a laterally confined soil sample and measuring the resulting vertical deformation over time.

The compressibility coefficient (Cc), volumetric compressibility coefficient (mv), recompression index (Cr), and consolidation coefficient (Cv) are measured. This describes the rate at which excess pore water pressure dissipates under applied load, and provides essential parameters for predicting primary consolidation settlement in the field. The resulting settlement–time data are analyzed using standard methods such as the logarithm of time or square root of time approach to calculate Cv.

The CBR test measures the resistance of a compacted or uncompacted soil sample to penetration by a standard piston. It is a widely used geotechnical laboratory and field method to evaluate the strength and stiffness of the foundation soil and the combined base layers for pavement thickness and structural design.

The Uniaxial Compressive Strength (UCS) test is a fundamental laboratory method used to determine the unconfined axial compressive strength (qu) and deformation characteristics of intact rock and soils. It can not be applied to fine-grained or granular soils, this test is not necessarily suitable as it does not maintain their shape without confinement.

A vertical deformation meter or LVDT (Variable Linear Differential Converter) measures the vertical deformation (shrinkage) of the soil sample under the applied load. The axial strain (ϵa) is calculated by dividing the vertical deformation by the original height of the sample.

The triaxial compressive strength test is an advanced geotechnical and rock mechanics laboratory method used to evaluate the strength and deformation behavior of soils and rocks under controlled stress conditions that more closely simulate in-situ loading than uniaxial tests.

The same device also used to determine the aggregate crushing strength, compressive strength of concrete, and measures the modulus of elasticity of the rock core under uniaxial compression using a hydraulic press and a force measuring cell. The device also measures the 10% fines value (TFV) of the crushed aggregate, which is a measure of the strength and compressive strength of the coarse aggregate.

 The test provides critical parameters such as cohesion (c), angle of internal friction (φ), shear strength, and stress–strain relationships, which are essential for foundation design, slope stability analysis, tunneling, and underground excavations.

The aggregate impact value (AIV) is the percentage of fine material (passing through a 2.36 mm sieve) resulting from a standard quantity of coarse aggregate (10–12.5 mm) subjected to standard impact loads. It is a measure of the aggregate's resistance to sudden impacts or collisions, an important property of materials used in pavement construction, particularly road surfaces. It is used to assess the toughness and resistance of aggregates to sudden impact or shock, which are critical properties for materials used in road pavements, concrete works, and other civil engineering applications.