Similar International Standards
ASTM D1587/D1587M-15(2020)ASTM International, USA
HighCurrent
Standard Practice for Thin-Walled Tube Sampling of Soils for Geotechnical Purposes
Defines the equipment and procedure for obtaining relatively undisturbed soil samples using thin-walled tubes (Shelby tubes).
BS EN ISO 22475-1:2021BSI (UK) / ISO (International)
MediumCurrent
Geotechnical investigation and testing — Sampling methods and groundwater measurements — Part 1: Technical principles for execution
Specifies technical principles for sampling, including requirements for samplers (like thin-walled tubes) to achieve specific sample quality classes.
JIS A 1221:2009Japanese Industrial Standards, Japan
HighCurrent
Methods for undisturbed soil sampling using a thin-walled tube sampler with fixed piston
Covers the apparatus and method for obtaining undisturbed soil samples, focusing on thin-walled tube samplers.
Key Differences
≠The maximum allowable Area Ratio (Cₐ) in IS 11594 is 15%, which is less strict than the <10% required by ISO 22475-1 for high-quality (Class 1) samples and the ≤10% recommended by ASTM D1587 for sensitive soils.
≠IS 11594 allows a wider Inside Clearance Ratio (Cᵢ) of 0.5% to 3.0%, whereas ASTM D1587 suggests a tighter range of 0.5% to 1.5% and ISO 22475-1 specifies 0% to 1.5% for Class 1 samples, affecting internal sample friction.
≠The Indian standard is specific to 'mild steel' for the tubes, while ASTM D1587 provides more flexibility, allowing for steel, stainless steel, or brass, which can offer better corrosion resistance.
≠IS 11594 specifies three nominal outside diameters (50, 75, 100 mm), whereas ASTM D1587 lists common imperial sizes (2, 3, 5 inches) which are similar but not identical.
Key Similarities
≈All standards specify a similar fundamental design: a thin-walled metal tube connected to a sampler head designed for pushing into the ground.
≈The requirement for a sharpened, tapered cutting edge at the base of the sampling tube is a common feature across all standards to ensure minimal disturbance during soil penetration.
≈The sampler head must be vented (e.g., via air vents or a check valve) to allow air and water to escape as the sample enters the tube, preventing pressure buildup that could disturb the sample.
≈The primary objective of all mentioned standards is to define equipment and methods for obtaining high-quality, relatively undisturbed soil samples suitable for laboratory testing of engineering properties.