Soil Investigation for Provision of Monsoon Drainage System in Tech Area and Airfield and associated works at AF Stn Jamnagar

Soil Investigation for Provision of Monsoon Drainage System in Tech Area and Airfield and associated works at AF Stn Jamnagar. soil investigation for RCC Box Culvert of width 3.50m as per IS: 1892-1979 by boring 100mm dia bore holes for 06m depth or upto a depth where N value reaches 50 whichever is earlier with the following criteria and services:- Criteria: Depth of bore holes may be taken 6m or N value reaches 50, whichever is earlier in any type of soil/soft disintegrated rock/hard rock for isolated /combined / raft foundation. To ensure that boulders or layers of cementeous soil is not mistaken for bed rock, core drilling to be done to a depth of atleast 3.0m in bed rock in areas where boulders are found & collection/ preparation of rock samples and determination of bulk density, water absorption and compressive strength is done. However the maximum depth of bore hole is 6m in any case.(A) Mobilisation of Mechanical drilling equipment / rig and shifting of entire arrange ment from one bore to another bore hole location and setting of boring/drilling rig as required/directed by Engineer-in-charge (B) Collection of undisturbed soil sample at 1.5m intervals or at any change in strata in 100mm bore thin walled tube including waxing, sealing, packing and transporting to the lab.(C) Carrying out Standard Penetration test(SPT) including collection of disturbed soil samples in bore holes at 1.2m, 1.5m and subsequently at every 1.5m depth or any change in strata and submit the report with all requisite data.(D) Conducting necessary tests as per relevant IS codes :-1892/NBC 2005/SP36 on all collected samples which include the determination of:- (a) Atterberg limits- Liquid limit, Plastic limit , Shrinkage limit (b) Wet and dry density, degree of saturation of soil. (c) Unit weight(Bulk density), Natural Moisture content, Plasticity index, Specific gravity (d) Grain size analysis, Identification and classification of soil, Soil particle size distribution using sieve/hydrometer analysis (e) Shear parameter (C-Phi Analysis), Tri-axial shear test and C-Phi determination. (f) Consolidation test and permeability test (g) Specific gravity test for sand/rock (h) Crushing strength, Degree of weathering(CR value) and RQD of rock samples (j) Permeability test (k) Chemical analysis of ground water sample (min 02samples) (water to be obtained from the bottom of bore hole) (l) Free swelling Index and Swelling pressure if expansive soil encountered. (m) Depth of water table below Ground level (maximum and minimum) (n) Presence of loose soil if any and its depth (o) If weak soil with lesser N value as specified in Table-I of IS 1893 (Part-I):2016 is encountered then evaluation of liquefaction potential shall be assessed and remedial action to be adopted shall be specified. (p) Chemical analysis of soil and recommendation and type of cement to be used for RCC foundation. (q) Recommendation for filling under floors and filling under protection including plinth protection. (E) Submission of report in four sets giving site plan showing the test points, sub soil profile, results of field investigations, laboratory test results, calculation of SBC, Comprehensive type of foundation. Notes: (a) Rate includes all items of work necessary for carrying out complete soil exploration work, collection of sample, testing at laboratory and field test results and submission of reports(Four sets) (b) Rate includes for submission of detailed recommendation for open foundation, calculation of NET SBC at 1.2m, 1.5m, 2.0m, 2.5m and 3.0m depth for 1.5mx1.5m, 1.5mx2.5m, 2.0mx2.5m, 2.0mx3.0m and 3.0mx3.0m size of footings for each and every depth mentioned here-in-before considering shear as well as settlement criteria. SBC shall be calculated based on C-Phi analysis as well as SPT value. For calculation formulae given in IS 6403 shall be used, type of foundation and depth of footing be clearly specified. (c) In case very weak soil strata is encountered , recommendation about pile foundation i.e type, Dia, Depth of pile, safe load carrying capacity and socketing of pile into hard rock shall be clearly given in the report. Also measure for ground improvement if reuired be included in the report. (d) The rates are including of all taxes.

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