Geotechnical Investigation and Soil Exploration works

Amount

GENERAL ABSTRACT OF COST

Part-I: Main Work

Description of Work / Item(s)

Amount

Boring vertically through all kinds of soils, weathered rock and soft rock, boulders, if any, met during drilling with suitable and adequate equipment of diameter, 100mm or more as required for depths as measured below existing ground level at rig location, including collection of soil & ground water samples, representative disturbed & undisturbed samples, labelling, handling & transporting it to laboratory for testing including Core Recovery Ratio (CRR) & Rock Quality Designation (RQD) measurement for rock samples as per IS:11315 (part 11), etc. all as per specifications for the following depths measured from exisiting ground level:

a) Depth from 0.0 m and upto 10 m

b) Depth from 10 m and upto 20 m

Drilling vertically through bedrock strata (Hard rock), using Nx size diamond bit or impregnated diamond bits, etc. depending on type of rock encountered, using double tube core barrel with suitable core catcher, including collection and logging of cores, placing them in approved wooden core boxes coated with a coat of Anti Termite chemical, in a proper sequence, numbering each core, noting the lithology and transporting the boxes to core store including Core Recovery Ratio (CRR) & Rock Quality Designation (RQD) measurement for rock samples as per IS:11315 (part 11), etc. all as per specifications for the following depths measured from exisiting ground level:

a) Depth from 0.0 m and upto 10 m

b) Depth from 10 m and upto 20 m

Field Test ( Insitu test ) Note: - No extra payment will be made for the following: 1) Mobilisation of personnel and equipments required for boring and in-situ tests, etc. 2) Dismantling and removal of various used equipments & accessories, etc. as required after completion of the work. 3) Backfilling of boreholes digged with 1:1 cement-bentonite grout as per directions of Engineer-in-charge to make the borehole site as per the original conditions Conducting Standard Penetration Test (SPT) as per IS:2131

Laboratory Tests :- All the Laboratory tests are to be conducted in NABL accredited laboratory in presence of departmental representatives. Grain size analysis including Grain size distribution curves as per practice Note: The test shall be conducted on Disturbed or Undisturbed samples collected from borehole as directed by Engineer-in-charge.

a) Sieve analysis as per IS:2720 (part 4)

b) Hydrometer or Pipette analysis

Bulk Density, Dry density and natural moisture content

Specific gravity as per IS: 2720 (part 3)

Liquid Limit, Plastic Limit, Plasticity index, etc. as per IS: 2720 (part 5)

Consolidation test giving all relevant information including but not limited to pressure versus void ratio curve, Compression index, preconsolidation pressure, Coefficient of secondary compression, Coefficient of consolidation, Coefficient of volume compressibility

Un-confined compressive strength on Undisturbed / Disturbed soil sample as per IS : 2720 (part 10) as directed by Engineer-in-charge.

Direct Shear test on Undisturbed / Disturbed soil sample as per IS:2720 (part 13) as directed by Engineer-in-charge

a) Undrained

b) Drained

Undrained Triaxial compressive strength on Undisturbed / Disturbed soil sample as per IS:2720 (part 11) as directed by Engineer-in-charge.

Unconfined compression strength (UCS) of rock core sample as per IS:9143 Note: - Each sample shall consist of atleast five nos. of samples.

a) without saturation

b) with atleast 7 days saturation

Water absorption and Porosity tests on rock cores as per IS:1124

Chemical analysis of Water taken from bore holes / test pits at different levels for parameters such as chloride, sulphate, calcium, magnesium, sodium, potassium, pH value, organic & inorganic solids, suspended matter etc.

Chemical analysis of Soil samples taken from bore holes / test pits at different levels for parameters such as chloride, sulphate, calcium, magnesium, sodium, potassium etc.

Report :- Preparing and submitting Final Geotechnical report in five Hard copies along with soft copy in Pendrive of subsoil investigation as detailed in the specifications including preparation of soil profile, bore logs, consolidation curves, etc. along with supporting calculations.The soil investigation report shall indicate the interpretation of the field and laboratory test results and make recommendations for type of foundations and net safe bearing capacities for design of foundation at various depths, pile capacity in addition to the routine report of the field work, laboratory work, bore hole log details, ground water table, levels, conditions etc. maintaining field books, and to be submitted at the end of work to department. The Geotechnical report shall incorporate i) Layout plan showing location of all boreholes and field tests, along with levels of existing ground at such locations with reference to datum as specified by Engineer-in-charge, properly drawn to scale and dimensioned with reference to established grid lines ii) All the details stipulated under technical data / requirement as per schedule of quantities iii) Existing Ground water table and the extent of fluctuation, if any iv) Cross-section of all individual boreholes with reduced levels and coordinates showing classification and thickness of individual stratum, position of ground water table, various in-situ & laboratory tests conducted and samples collected at depths and the rock stratum, if met with v) Set of longitudinal and transverse soil / rock profiles connecting various boreholes shall be presented in order to give clear picture of variation of soil / rock strata (both vertically and horizontally) at site vi) Plot of SPT 'N' value (both uncorrected and corrected) with depth Please refer additional notes for this item.

(i) For New Commercial Centre Near Kamet Building

(ii) For New Commercial Centre Near Brindwan Building

(iii) For New Creche Faciliy Near Badrinath Building

Jay Gajanan Geotechnics

BECQUEREL INDUSTRIES PVT. LTD.

SKW SOIL AND SURVEY CO

Jay Gajanan Geotechnics

BECQUEREL INDUSTRIES PVT. LTD.

SKW SOIL AND SURVEY CO