GEOLABS Limited - Geotechnical Laboratory Testing

www.geolabs.co.uk	GEOLABS Limited . . . Tel: +44 (0)1923 892 190 . . Fax: +44 (0)1923 892 191 Permeability - Triaxial Permeability (BS1377:Part 6:Clause 6)
Home Quick Prices Testing Index Classification Compaction Compressibility Permeability Triaxial Constant Head K H Head Accelerated Durability Hydraulic Cell Tests Total Stress Effective Stress Rock Advanced Miscellaneous Accreditation Applications Contact Us About Us Other Links	Results given:	You provide:
	Coefficient of Permeability	Remoulding conditions, if applicable. Effective consolidation pressure Differential pressure or hydraulic gradient (optional)
	Typical use(s):	Material required:
	Ensuring permeability of landfill clay liner meets required specification.	if remoulded, 2 kg (for 100mm diameter specimen) if undisturbed,100mm diameter core-cutter or liner sample, at least 100mm intact length.
	Description	Price excl. VAT
	Triaxial Permeability up to 4 days duration (BS1377 : Part 6 : Clause 6 : 1990)	£ 95.00
	Extra over days in excess of initial 4 days	£ 25.00 per day
	Remoulding specimen	£ 17.50
	Notes
	The duration of this test is material dependent. To ensure accurate, repeatable results, we follow the British Standard method (BS1377 : Part 6 : Clause 6:1990) involving saturation to a B value of 0.95, followed by consolidation to at least 95% pore pressure dissipation. Although not a rapid test, typical durations are often less than some people's preconceptions. As a rough guide, we have found the following chargeable durations typical:
	Material Type	Typical Chargeable Duration	Typical Cost
	Cement bentonite grout mixes	7 days	£ 164
	Stiff London Clay	9 days	£ 200
	Very soft alluvial very silty clay (material already saturated, but long consolidation stage)	8 days	£ 182
	Silty sandy boulder clay	6 days	£ 146
	Bentonite enriched sands	10 days + (see note below)	£ 218 +
	BES typically displays a gradually lessening permeability with time as the bentonite hydrates and swells. As a definitive linear permeability is unclear, we liaise with the client to ensure we meet their testing requirements. Where testing durations are anticipated to be exceptional, we may negotiate special rates for any additional days.