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IS 8381:1977 is the Indian Standard (BIS) for recommended practice for quarrying stones for construction purposes. This standard provides recommended practices for quarrying natural stones for construction purposes. It covers aspects like site investigation, quarrying methods (including manual, mechanical, and blasting techniques), and critical safety precautions during operations.
Recommended practice for quarrying stones for construction purposes
! The choice of quarrying method (blasting vs. non-blasting) is critical. Blasting is unsuitable for ornamental or dimensional stones as it induces micro-cracks, affecting strength and appearance.
! Strict adherence to safety protocols in Clause 5 and IS 4081 is paramount, especially regarding handling of explosives and maintaining stable quarry faces.
! Thorough site investigation as per Clause 3 is essential to determine the economic viability and quality of the stone deposit before major investment.
HSE L118 (Third edition)Health and Safety Executive (HSE), UK
MediumCurrent
Health and safety at quarries. Quarries Regulations 1999. Approved Code of Practice
Overlaps on the health and safety aspects of quarry operations, but is vastly more detailed and legally binding.
NSI Dimension Stone Design Manual v8Natural Stone Institute (NSI), USA
HighCurrent
Dimension Stone Design Manual
While a design manual, its sections on quarrying methods provide the most direct modern equivalent to the practical guidance in IS 8381.
BS EN 1467:2012BSI / CEN, UK / Europe
MediumCurrent
Natural stone — Rough blocks — Specifications
Specifies the required quality of the quarried product (rough blocks), indirectly influencing quarrying practice to minimize damage.
ASTM C119-19ASTM International, USA
LowCurrent
Standard Terminology Relating to Dimension Stone
Covers the classification and terminology of stone, which is a foundational element in IS 8381's scope.
Key Differences
≠IS 8381 (1977) details historic blasting agents like gunpowder and gelignite. Modern practices utilize advanced, safer explosives like ANFO, emulsions, and low-energy detonating cords for controlled splitting.
≠The Indian standard makes no mention of environmental regulations. Modern international quarrying is heavily governed by environmental impact assessments, dust suppression mandates, water management, and land reclamation plans.
≠IS 8381's safety guidelines are rudimentary (e.g., 'avoid overhanging ledges'). Modern standards like HSE L118 mandate comprehensive, documented safety management systems, risk assessments, specific training, and stringent controls for dust (silicosis prevention).
≠The primary cutting methods in IS 8381 are blasting and manual wedging. Modern dimension stone quarrying predominantly uses diamond wire saws, chain saws, and belt saws to maximize yield and eliminate micro-fractures caused by blasting.
Key Similarities
≈Both the Indian standard and modern practices emphasize the critical importance of preliminary geological investigation to assess stone quality, quantity, defects, and overburden before commencing quarrying.
≈The fundamental principle of splitting stone using wedges (often called 'plug and feather') described in IS 8381 remains a valid and widely used technique today, especially for smaller-scale operations or for secondary splitting of blocks.
≈The concept of quarrying in benches or steps to ensure a stable and workable face is a core principle shared by IS 8381 and all modern quarrying guidelines.
≈Both old and new standards share the core objective of extracting stone blocks with minimal induced damage, whether through careful blasting as per IS 8381 or advanced wire sawing in modern practice.
Parameter Comparison
Parameter
IS Value
International
Source
Primary Cutting Method for Dimension Stone
Blasting and manual wedging are the primary methods described.
Diamond wire sawing is the preferred primary extraction method to avoid micro-fractures.
NSI Dimension Stone Design Manual
Bench Height Recommendation
Should not generally exceed 6 m, but is adaptable.
Highly variable based on geology and equipment; typically 10-20 m. Determined by equipment reach and rock mass stability analysis.
General Quarry Practice / HSE L118
Dust Control Method
Recommends spraying water to reduce 'dust nuisance'.
Mandates wet drilling or local exhaust ventilation (LEV) to meet legal occupational exposure limits for respirable crystalline silica (e.g., <0.1 mg/m³).
HSE L118
Face Safety Inspection
The quarry face should be inspected regularly for loose blocks.
Formal, documented daily inspections of faces and benches by a 'competent person' are legally required.
HSE L118
Blasting Safety Zone
Persons should be withdrawn to a 'safe distance' before firing.
A 'danger zone' must be calculated based on a site-specific risk assessment of fly-rock potential, typically 300-500m minimum.
HSE L118
Block Grading
No detailed grading system specified, focuses on being 'free from defects'.
Specifies detailed requirements for geometry (shape, dimensions), and allowable presence of cracks, veins, or inclusions.
BS EN 1467:2012
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Maximum bench height for manual quarrying1.5 m
General maximum overall slope of quarry face60 degrees from horizontal
Typical blast hole spacing to burden ratio0.8 to 1.2
Minimum distance for storing explosives from working area100 m
Recommended slope of quarry benchesNearly horizontal or slightly sloping towards the face
What determines the method used for quarrying stone?+
The type of stone, its geological formation, and its intended end-use. Blasting is for aggregates, while non-blasting methods are for dimensional stone (Clause 4.1).
What are the key safety rules for a quarry face?+
The face must be kept free of loose, overhanging rock, and the overall slope should generally not exceed 60 degrees from the horizontal (Clause 5.1).
When should blasting be avoided?+
Blasting should be avoided for stones that are soft, stratified, or intended for ornamental work, as the shock can cause fractures and render the stone useless (Clause 4.3.1).
What is the difference between burden and spacing in blasting?+
Burden is the distance from the blast hole to the nearest free face, while spacing is the distance between adjacent blast holes in the same row (as defined in IS 6609).