Name of Work: ADDITION / ALTERATION TO SMALL COMPRESSOR TEST FACILITY (BLDG NO. P-56) AT GTRE, BANGALORE (SOIL INVESTIGATION)
Sl. No.
Item Description
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a) Carrying out soil investigation at work site of project by drilling of bore holes of 150 mm dia upto 10 m depth and trial pits of size 1.2mx1.2mx3.0m at the location as per IS 1892-1979 (Reaffirmed 2002) , collecting samples of disturbed and undisturbed soil sample. Drilling for 2.0m depth inside the rock if essential to ensure that boulders or layers of cemented soil are not mistaken for rock and conducting test as per relevant and latest IS code as mentioned below:-b) Number of test Holes :i) Trial pit size 1.2x1.2x3.0m -1 NoDetails and Tests required :(i) Grain size analysis, identification & Classification of soil(ii) Unit weight (Bulk density), natural moisture content, liquid limit, plastic limit, shrinkage limit, plasticity index, specific gravity, dry density and degree of saturation of soil.(iii) Differential free swell index (\"fa) & swelling pressure if expansive soil isencountered.(iv) Shear Parameters (C-Phi Analysis) andConsolidation test (for cohesive soil only)(v) Chemical analysis of soil and ground water (Water to be obtained from bottom of the bore hole) Depth of water table below(vi) Presence of loose soil if any. If weak soil with lesser N value as specifiedin table — 1 of IS 1893 (Part-1) 2016 is encountered then evaluation of liquefaction potential shall be assessed and remedial action to be adoptedshall be soecified.(vii) Crushing strength, degree of weathering (CR Value) and RQD of rocksamples
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(viii) For calculation of Net SBC at 1.5m, 2.0m, 2.5m,3.0m upto 10.00m from shear as well as settlement criteria. SBC value shall be calculated based on C-Phi analysis as well as SPT value. For calculations, formulae given in IS 6402 shall be used or recommended depth of pile of different diameter etc shall be specified along with supporting calculations. Pile capacity in compression, uplift & lateral loads shall be oiven.(x) Recommendations regarding type of foundation to be adopted & netSBC/Pile capacities to be adopted Also recommendations shall be given reoardino stabilitv of soil and soil stabilization reauired. if anv.(xi) Bore log details duly marked on plan and their distance from adjacentprominent ref as per Appx D of IS 1892. N values depth wise shall also be shown in bore loo details(xii) SPT shall be done till N value of 50 or refusal whichever is earlier.Note : Following will be in scope of order and must be the part of final report :a) Report shall be signed by a qualified engineer with degree in M techhaving experience of minimum 02 Years. Then name and qualification of the signatorv shall be clearlv shown.
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b) Soil investigation consultant should have minimum 01 No ME/M Tech(Geo Tech) with 2 Year experience & 01 no BE/B Tech (Civ) with 5 Year Exoerience and must have all adeauate tech staff diDlOlTla/ITI Qualified.c) Labs must be NABL accredited or nay other accreditation body whichoperates in accordance with ISO/IEC-170011 and accredits the lab as per ISO/IEC:17025 with state of the art eauioment aooaratus.d) RL of the Ground level/Founding level with ref to a BM should invariablybe mentioned in the test report.e) Recommendation of SBC should be given for :- The bore hole,Depths viz 1.5m, 2.0m and 2.5m upto 12 m (f) Photographic records of exploration as well as the testing shall be formthe part of thr report. Also Soil or rock samples left out after tests shall be handed over to AGE B/R or Engr-in-Charge.
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(g) Recommendation as regards possibility of liquidation of soil in case of saturated or partially saturated loose/uncompacted sandv soils.(h) Swelling index and swelling pressure in respect of black cotton soil andits depth/layer.(i) Depth of ground water table (GWT) in peak monsoon and peak summer (highest) after correlation of result with seasonal variation of water table in the station.(j) Recommendation for filler under floors and improvements of existingsubsoil using proper soil stabilization methods or stabilization of soil underneath foundation systems.
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