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The feature that helps to estimate the relative density of coarse-grained soil is _______
Soundings
Shallow test pits
Exploratory borings
Geophysical method
Soundings
Soundings are field investigation techniques used to determine the consistency or relative density of soils by measuring the resistance offered by the soil to the penetration of a sampler or probe. In coarse-grained soils, standard penetration tests (SPT) or cone penetration tests (CPT) are effectively used to correlate penetration resistance with relative density (DrтАЛ).
Soundings are field investigation techniques used to determine the consistency or relative density of soils by measuring the resistance offered by the soil to the penetration of a sampler or probe. In coarse-grained soils, standard penetration tests (SPT) or cone penetration tests (CPT) are effectively used to correlate penetration resistance with relative density (DrтАЛ).
DrтАЛ=emaxтАЛтИТeminтАЛemaxтАЛтИТeтАЛ├Ч100% тАФ Relative Density formula where e is the void ratio.
NтИЭDr2тАЛ тАФ Empirical correlation between SPT blow count (N) and relative density in sands.
The principle relies on the relationship between soil resistance and physical state. As a tool is driven into the ground, the force required (or blow count) correlates to the interlocking of grains and confinement. Higher penetration resistance directly indicates a higher relative density state for granular deposits.
Soundings include Standard Penetration Test (SPT), Cone Penetration Test (CPT), and Vane Shear Test.
Relative density is only applicable to non-cohesive (coarse-grained) soils.
SPT is the most common sounding method for estimating relative density in the field.
Provides continuous data profile
Cost-effective for large areas
Direct field estimation without sampling
Limited for gravelly soils due to large particles
Cannot be used for lab-based classification
Influenced by groundwater table
Foundation site characterization
Liquefaction potential analysis
Compaction control of sandy fills
The relative density ranges from 0% (very loose) to 100% (very dense).
Shallow test pits are used for visual inspection, not penetration testing.
Exploratory borings are for sample recovery, not direct estimation of density.
A is correct тАФ Soundings are the primary field exploration method that utilizes penetration resistance to quantify the relative density of coarse-grained soils.
Always remember that soundings (SPT/CPT) are ideal for granular soils, whereas Vane Shear tests are preferred for soft sensitive clays.