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In detailed exploration, the field test is conducted to determine ________
Tensile strength
Rigidity
Permeability
Water content
Permeability
In detailed soil exploration, field permeability tests (such as pumping-out or pumping-in tests) are conducted to accurately determine the hydraulic conductivity of soil strata in their natural, undisturbed state. Permeability is a critical parameter required for designing foundation dewatering, seepage analysis, and stability assessment of retaining structures.
In detailed soil exploration, field permeability tests (such as pumping-out or pumping-in tests) are conducted to accurately determine the hydraulic conductivity of soil strata in their natural, undisturbed state. Permeability is a critical parameter required for designing foundation dewatering, seepage analysis, and stability assessment of retaining structures.
k=AтЛЕiQтАЛ тАФ Darcy's Law for soil permeability
k=╧А(h22тАЛтИТh12тАЛ)qln(r2тАЛ/r1тАЛ)тАЛ тАФ Dupuit's formula for pumping-out test in an unconfined aquifer
Field permeability tests determine hydraulic conductivity k by measuring the rate of water flow into or out of a borehole or well under a known hydraulic gradient. Unlike laboratory tests, field tests evaluate a larger, undisturbed volume of soil, accounting for natural stratification, macro-pores, and structural discontinuities.
Field permeability tests (e.g., Pumping-out test, Pumping-in test, Packer test) reflect actual field conditions better than laboratory tests.
Detailed soil exploration involves determining engineering properties like permeability, shear strength, and compressibility to finalize foundation designs.
Tests larger, representative soil volume including macro-features
Avoids disturbance caused by sample retrieval for lab testing
Expensive and time-consuming compared to laboratory tests
Requires specialized pumping and observation equipment
Designing dewatering systems for deep excavations
Seepage analysis for dams, levees, and retaining walls
Tensile strength: Not a primary soil property; soil has negligible tensile strength.
Rigidity: Evaluated via modulus of rigidity/shear modulus through dynamic field tests (e.g., cross-hole seismic testing), not general field exploration permeability tests.
Water content: Evaluated primarily via quick laboratory methods (e.g., oven drying, calcium carbide method) or core sampling during preliminary exploration.
C is correct тАФ In detailed soil exploration, field tests such as pumping-out or pumping-in tests are carried out to determine soil permeability in its undisturbed natural state.
Remember: Laboratory permeability tests (constant/falling head) use small disturbed/undisturbed core samples, while field permeability tests (pumping-out/in) yield the macro-permeability of the entire aquifer stratum.
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