Geotech Investigation SP-III

MOBILISATION

Mobilization of hydraulic boring and drilling rig with suitable casing up to desired depth, other in-situ test equipment, personnel etc. for carrying out investigations on land and demobilization on completion of work and removal from site. NOTE: Prefarably 2 Nos Hydraulic Rigs are required to complete the entire field & loboratory tests work including mobilization time, shifting between bore holes, machine breakdown etc within the stipulated project timeline of maximum 4 months.

FIELD INVESTIGATION

Setting up of boring rig at each borehole location including moves between borehole positions, locating, and marking the location on the ground by actual survey (by using precision position instruments such as GPS and Total Station), setting up all field test equipment and bringing all personnel to the location, making area good for setting up rig etc. complete all as per the IS Specification and as directed by Engineer. Any criss-cross or back and forth movement of the rig can take place. No additional compensation will be paid for such movements. The break-ups for 45 Nos Boreholes of 1350 RM depth are given below:

Boring vertically through all kinds of soils, weathered rock, and soft rock with suitable and adequate equipment of diameter 150mm or 200mm, for depths as measured below existing ground level at rig location etc. all as per the IS Specification and as directed by Engineer: a) 0-10m This shall include collection of disturbed samples or at every change in stratum and preserving the same in airtight container with proper labelling, packaging & transporting to laboratory for conducting required laboratory tests.

Boring vertically through all kinds of soils, weathered rock, and soft rock with suitable and adequate equipment of diameter 150mm or 200mm, for depths as measured below existing ground level at rig location etc. all as per the IS Specification and as directed by Engineer: b) 10-20m This shall include collection of disturbed samples or at every change in stratum and preserving the same in airtight container with proper labelling, packaging & transporting to laboratory for conducting required laboratory tests.

Boring vertically through all kinds of soils, weathered rock, and soft rock with suitable and adequate equipment of diameter 150mm or 200mm, for depths as measured below existing ground level at rig location etc. all as per the IS Specification and as directed by Engineer: c) 20-30m This shall include collection of disturbed samples or at every change in stratum and preserving the same in airtight container with proper labelling, packaging & transporting to laboratory for conducting required laboratory tests.

Drilling vertically through boulders and hard rock strata using NX size diamond bit, using double tube core barrel with suitable core catcher, including collection and logging of cores, placing them in wooden core boxes in a proper sequence, numbering each core etc. all as per IS Specifications for the following depths measured from existing ground level. Item includes all the handling charges and dispatching of the core’s boxes/ samples to laboratory for necessary test etc. all as per the IS Specification and as directed by engineer in charge. a) 0-10m Note: Experienced geologist shall supervise the core logging and shall also describe the rock in their fresh condition with presence of discontinuity, fracture, weathering conditions etc.

Drilling vertically through boulders and hard rock strata using NX size diamond bit, using double tube core barrel with suitable core catcher, including collection and logging of cores, placing them in wooden core boxes in a proper sequence, numbering each core etc. all as per IS Specifications for the following depths measured from existing ground level. Item includes all the handling charges and dispatching of the core’s boxes/ samples to laboratory for necessary test etc. all as per the IS Specification and as directed by engineer in charge. b) 10-20m Note: Experienced geologist shall supervise the core logging and shall also describe the rock in their fresh condition with presence of discontinuity, fracture, weathering conditions etc.

Drilling vertically through boulders and hard rock strata using NX size diamond bit, using double tube core barrel with suitable core catcher, including collection and logging of cores, placing them in wooden core boxes in a proper sequence, numbering each core etc. all as per IS Specifications for the following depths measured from existing ground level. Item includes all the handling charges and dispatching of the core’s boxes/ samples to laboratory for necessary test etc. all as per the IS Specification and as directed by engineer in charge. c) 20-30m Note: Experienced geologist shall supervise the core logging and shall also describe the rock in their fresh condition with presence of discontinuity, fracture, weathering conditions etc.

Obtaining 90 mm diameter 450 mm long undisturbed (UDS) soil samples by using thin-walled soil samplers / shelby tube at every 3m interval up to 10 m depth or at change of strata alternate to SPT from boreholes and sealing with wax and labelling the container including transporting to laboratory for conducting required laboratory tests. In case of UDS sample could not be extracted for a depth that shall be replaced with SPT for the respective depth as per IS specification and as directed by Engineer.

Conducting Standard Penetration Tests (SPT) in soil, soft and weathered rock at 3m intervals or at every change of strata alternate to undisturbed sampling and collecting the disturbed sample from split-spoon sampler. Packaging and labelling the disturbed soil including transporting to laboratory for conducting required laboratory tests as per IS specification and as directed by Engineer.

Collection of disturbed (DS) bulk soil samples (Min 35 Kg Each) from dump yards for various laboratory tests for the backfilling soils including packaging, labelling and transporting the disturbed soil to the laboratory for conducting required laboratory tests as per IS specification and as directed by Engineer.

LABORATARY TESTS

Grain size analysis: a) Hydrometer analysis

Grain size analysis: b) Sieve analysis

Atterberg's Limits: a) Liquid Limit (LL)

Atterberg's Limits: b) Plastic Limit (PL) and Plasticity Index

Atterberg's Limits: c) Shrinkage Limit (SL) and Shrinkage Ratio.

Field Density and Moisture Content of Undisturbed (UDS) Samples

Proctor Density (MDD & OMC) on Disturbed (DS) Bulk Samples. a) Standard Proctor

Proctor Density (MDD & OMC) on Disturbed (DS) Bulk Samples. b) Modified Proctor

Specific Gravity of soil.

Free Swell Index measurement

Laboratory Permeability Test on DS samples compacted to specified density & moisture content. (MDD & OMC from Standard / Modified Proctor Test)

Unconfined Compressive Strength (UCS) test on UDS samples or soil samples compacted to specified density & moisture content. (MDD & OMC from Standard / Modified Proctor Test)

Direct Shear test on soil samples compacted to specified density & moisture content (MDD & OMC from Standard / Modified Proctor Test)

Tri-axial Compressive Strength test on undisturbed soil samples or soil samples compacted to specified density & moisture content. (MDD & OMC from Standard / Modified Proctor Test) (a) Unconsolidated Undrained test. (UU)

Tri-axial Compressive Strength test on undisturbed soil samples or soil samples compacted to specified density & moisture content. (MDD & OMC from Standard / Modified Proctor Test) (b) Consolidated Undrained test. (CU)

Tri-axial Compressive Strength test on undisturbed soil samples or soil samples compacted to specified density & moisture content. (MDD & OMC from Standard / Modified Proctor Test) (c) Consolidated Drained test. (CD)

Consolidation test on UDS soil samples or on soil samples compacted to specified density, giving full test results including unit weights, specific gravity, e-log p curve, virgin curve, p0, e0, Cc, Cv and mv for all pressure increments, etc. (Tests without presentation of these results will not be paid for.)

Specific gravity of rock sample

Unit weight & moisture content of rock sample

Water absorption & porosity of rock samples.

Point Load Index Test on core samples

Unconfined compression strength of rock core: a) Without saturation

Unconfined compression strength of rock core: b) With at least 7 days saturation

PREPRATION OF REPORTS

Preparation and submission of two nos hard copies of complete "Geotechnical Investigation Report" for each area including all field & lab test results, borelogs, lab records, graphs, interpretations, analysis, calculations and foundation recommendations. NOTE: The final report in soft copies in pdf / word format shall be submitted along with hard copies.