The investigation includes borehole drilling, collection of disturbed samples (DS) and undisturbed samples (UDS) at required depth intervals, and conducting Standard Penetration Tests (SPT) to evaluate soil density and consistency. The SPT is generally carried out at regular intervals or at changes in strata to obtain N-values for design purposes. In case of hard strata or rock, core drilling is performed using appropriate drilling equipment. The recovered rock cores are examined to determine Core Recovery and Rock Quality Designation (RQD), which indicate the quality, strength, and degree of fracturing of the rock mass. The investigation also involves careful logging of soil and rock strata, recording groundwater table, and noting field observations. Collected samples are tested in the laboratory to determine engineering properties such as grain size distribution, Atterberg limits, shear strength, compressibility, and unconfined compressive strength of rock. The data obtained from field and laboratory investigations is used to assess bearing capacity, settlement characteristics, and other foundation parameters required for safe and economical design of structures. This dry drilling method ensures minimal disturbance to soil structure and is effective in obtaining reliable geotechnical data under suitable ground conditions.

The investigation includes borehole drilling, collection of disturbed samples (DS) and undisturbed samples (UDS) at required depth intervals, and conducting Standard Penetration Tests (SPT) to evaluate soil density and consistency. The SPT is generally carried out at regular intervals or at changes in strata to obtain N-values for design purposes. In case of hard strata or rock, core drilling is performed using appropriate drilling equipment. The recovered rock cores are examined to determine Core Recovery and Rock Quality Designation (RQD), which indicate the quality, strength, and degree of fracturing of the rock mass. The investigation also involves careful logging of soil and rock strata, recording groundwater table, and noting field observations. Collected samples are tested in the laboratory to determine engineering properties such as grain size distribution, Atterberg limits, shear strength, compressibility, and unconfined compressive strength of rock. The data obtained from field and laboratory investigations is used to assess bearing capacity, settlement characteristics, and other foundation parameters required for safe and economical design of structures. This dry drilling method ensures minimal disturbance to soil structure and is effective in obtaining reliable geotechnical data under suitable ground conditions.

1. Identification & Classification Properties Properties: Soil Type (Clay, Sand, Silt, Gravel) Particle Size Distribution Plasticity Characteristics Tests: Moisture Content Test Specific Gravity Test Grain Size Analysis (Sieve Analysis & Hydrometer Test) Atterberg Limits (Liquid Limit, Plastic Limit, Shrinkage Limit) Soil Classification (USCS / AASHTO System) 2. Strength Properties Properties: Shear Strength (Cohesion “c” & Angle of Internal Friction “φ”) Bearing Capacity Stability of Soil Tests: Triaxial Shear Test (UU, CU, CD) Direct Shear Test Unconfined Compression Test (UCS) Vane Shear Test (Lab / Field) 3. Compaction Properties Properties: Optimum Moisture Content (OMC) Maximum Dry Density (MDD) Tests: Standard Proctor Test Modified Proctor Test 4. Consolidation & Settlement Properties Properties: Compressibility Settlement Characteristics Rate of Settlement Tests: One-Dimensional Consolidation Test (Oedometer Test) Swell Pressure Test Collapse Potential Test 🔹 5. Permeability Properties Properties: Coefficient of Permeability (k) Seepage Characteristics Tests: Constant Head Permeability Test (for coarse soil) Falling Head Permeability Test (for fine soil) 6. Density & State Properties (Soil ki compactness aur field condition) Properties: Bulk Density Dry Density Relative Density (for sand) Degree of Compaction Tests: Bulk Density Test Dry Density Test Relative Density Test 7. Special Properties (Project Specific) Properties: Swelling & Shrinkage Behavior Expansive Nature CBR Value (Road Design) Tests: Free Swell Index Test Swell Pressure Test California Bearing Ratio (CBR) Test