Link points to Internet Archive / others. Not hosted by InfraLens. Details
IS 13094:1992 is the Indian Standard (BIS) for selection of ground improvement techniques for foundation in weak soils -guidelines. This standard provides guidelines for selecting appropriate ground improvement techniques for foundations on weak or problematic soils. It describes various methods like vibro-compaction, dynamic compaction, preloading, stone columns, and grouting, and outlines their applicability based on soil type, project requirements, and site conditions.
Selection of ground improvement techniques for foundation in weak soils -Guidelines
FHWA-NHI-17-074Federal Highway Administration (FHWA), USA
HighCurrent
Ground Improvement Methods Reference Manual - Volume I & II
Provides a comprehensive overview and detailed selection guidance for a wide range of ground improvement techniques.
CIRIA C573Construction Industry Research and Information Association (CIRIA), UK
HighCurrent
A guide to ground treatment
Offers specific guidance on the selection, specification, and application of ground treatment techniques.
Technical Standards for Port and Harbour FacilitiesThe Overseas Coastal Area Development Institute of Japan (OCDI), Japan
MediumCurrent
Technical Standards and Commentaries for Port and Harbour Facilities in Japan
Includes a significant section on selecting ground improvement methods, with a focus on weak marine deposits and seismic areas.
EN 1997-1:2004European Committee for Standardization (CEN), Europe
LowCurrent
Eurocode 7: Geotechnical design - Part 1: General rules
Provides the overall design framework under which the selection of a suitable ground improvement method is a required consideration.
Key Differences
≠IS 13094 is a concise (approx. 20 pages) high-level guideline, whereas international equivalents like the FHWA manual are exhaustive multi-volume reference documents with detailed design examples and QA/QC procedures.
≠The Indian standard primarily focuses on techniques prevalent in 1992, such as preloading, stone columns, and basic grouting. Modern international guides cover a broader array of advanced techniques like Controlled Modulus Columns (CMCs), deep soil mixing variants, and specialized geosynthetics.
≠IS 13094 provides qualitative selection tables. International guides (e.g., CIRIA C573) offer more quantitative selection criteria, including detailed charts linking techniques to soil grain size distribution and plasticity.
≠International standards, particularly from Japan and the US West Coast, place a much stronger emphasis on the seismic performance of improved ground and liquefaction mitigation, a topic less detailed in IS 13094.
Key Similarities
≈All standards share the fundamental purpose of guiding engineers in choosing the most suitable ground improvement method based on site-specific conditions and project requirements.
≈The primary selection criteria are consistent across all standards, including soil type, required bearing capacity, settlement control, cost, construction time, and environmental impact.
≈Both IS 13094 and its international counterparts categorize improvement techniques based on their primary function: densification, consolidation, reinforcement, or chemical stabilization/grouting.
≈They all utilize a matrix or flowchart approach (e.g., Table 1 in IS 13094) to provide a preliminary screening of applicable techniques against various soil types and project objectives.
Parameter Comparison
Parameter
IS Value
International
Source
Applicability of Stone Columns in Soft Clay (Undrained Shear Strength, Cu)
Suitable for soft to firm clays, generally with Cu > 15 kPa.
Optimal for clays with Cu in the 15-50 kPa range. Special measures required for Cu < 15 kPa to ensure column stability.
CIRIA C573 / General Practice
Initial classification of loose sand requiring improvement (SPT-N value)
Sand with SPT-N value < 10 is classified as 'Very loose to loose' and is a candidate for improvement.
Sands with corrected (N1)60 < 15 are often considered for densification, especially in seismic zones.
FHWA-NHI-17-074
Effective treatment depth for Dynamic Compaction
Suggests effectiveness up to a depth of 10 m.
Effective depth (D in m) is often estimated as D ≈ 0.5 * √(W*H), where W is tamper weight (tons) and H is drop height (m). Typically 5-10 m.
FHWA-NHI-17-074
Applicability of Cement Grouting based on soil type
Suitable for fissured rock, gravels, and coarse sands.
Provides grain size limits: Generally applicable for soils with a D10 size > 0.2 mm (coarse to medium sand and coarser).
CIRIA C573
Applicability of Prefabricated Vertical Drains (PVDs)
Recommended for soft saturated clays, silty clays, and organic deposits to accelerate consolidation.
Applicable for soils with low permeability, typically < 10⁻⁷ m/s, such as soft clays, silts, and peats.
EN 15237 (Execution of Vertical Drainage)
Surcharge magnitude for Preloading
Surcharge load should be equal to or greater than the final imposed load from the structure.
Surcharge load is typically 10-30% higher than the permanent design stress to induce over-consolidation and reduce secondary settlement.
FHWA-NHI-17-074
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Vibro-compaction fines content limit< 15-20%
Dynamic Compaction effective depthUp to 10 m
Stone Column suitable soilSoft clays, silts and clayey sands
Preloading suitable soilNormally consolidated clays and silts
Lime Piles/Columns suitable soilSoft clays with high moisture content
Grouting permeability range for cement10^-1 to 10^-4 cm/s
Tables & Referenced Sections
Key Tables
Table 1 - Applicability of Ground Improvement Techniques
Key Clauses
Clause 4 - Information Required
Clause 5 - Selection of Ground Improvement Technique
Clause 6 - Description of Various Ground Improvement Techniques
Appendix A - Chart for Selection of Ground Improvement Technique