SOIL INVESTIGATION FOR ADDITION AND ALTERATION TO COMPOUND WALL OF SMA AT MADURAVOYAL (E,B BLOCK) AT INS ADYAR UNDER AGE(I) NAVY CHENNAI

Amount

Mobilisation of equipment to site for detailed soil investigation and shifting them location to location of boreholes and for in-situ tests.

Boring holes 150 mm dia in any type of soil including weathered rock, SDR and soft rock, but excluding hard rock/fractured rock upto a depth until hard rock/fractured rock strata encountered including following activities. a. Conduct SPT at every 1.5 meter interval or change of starta whichever occurs earlier. b. Collection of undistrubed soil samples (UDS) at every 1.5 meter interval or change of starta whichever occurs earlier ( a mimimum gap for 500 mm shall be ensured between SPT and collection of UDS). Note : (i) In case of meeting boulders, the boring beyond boulder depth shall be measured under this item. ii) In case of non - Feasibility of collection of undisturbed soil sample, disturbed soil sample shall be collected, duly recording the reason

Conduct of following laboratory tests as per relevant Indian standards (See IS 2720(all parts) IS 1498 and IS 3025 on soil sample collected a) Test on disturbed/undisturbed soil smaples i) Visual and engineering classification ii) Seive analysis and hydrometr analysis iii) Atterberg limits (Liquid Limit, Plastic Limit and Shrinkage Limit) iv) Specific gravity v) Free swell Index b) Test on undisturbed Soil samples. i) Bulk density and mositure content ii) Unconfined compression test (on remoulded undisturbed sample) iii) Swelling pressure (on undisturbed and remoluded sample) iv) Determination of C & ø vlaues using direct shear test (drained/undrained) on remoulded or undisturbed sample or Triaxial compression tests(on undisturbed or remoulded sample) or vane shear test

Chemical analysis of ground water sample collected at bottom of one borehole

Chemical analysis of soil samples one each from each starta in respect of one borehole. If different starta(s) encountered in any other borehole additional soils samples to be analysed

Notes: Composition of subsurface Investigation Report 1.General On completion of the in-site and laboratory tests, subsurface investigation report shall be prepared which should include geological information, procedure adopted for investigation, field observations, laboratory or test data, analysis, interpretation, recommendations etc. 1.2 Information to be provided:- The report shall include but not be limited to the following; a) Dimensioned Plan showing location and depth of in-situ tests; the co-ordinates of bore hole locations with reference to prominent permanent features of the site duly signed by GE/AGE(I) and Geo consultant; b)Geological information of the area; c)General topography of the site, duly marking RL of the location of bore holes with reference to RL of nearby permanent features available at site duly signed by d)GE/AGE(I) and Geo Consultant; Borelog and trial pit log duly signed by GE/AGE(I) and Geo Consultant; d) Past usage and historical data of the site, if available Information regarding flooding of the site in the past, highflood level etc. e)In-situ test results; g)Plot of standard penetration test (N values both uncorrected and corrected) with depth for identified areas; h)Laboratory test results j)Summary of strata profile.

Notes Contd…. 1.2.1 Reporting of in-situ and laboratory test results should be in accordance with relevant Indian Standards 1.3 Analysis and interpretation of results. The following shall be included in the report (a) Analysis of test results (b) Discussion and interpretation of results analysed including basic of adopting design parameters for the substrata (c) For shallow foundations (i) net allowable bearing pressure considering shear, settlement criteria as well as SPT value for isolated footing continuous strip footing and raft foundation at depth 1.5m, 2.0m. for calculations IS 6403 shall be used. (ii) Modulus of subgrade reaction and modulus of elasticity of substrata (d) If week soil with lesser N value as specified in table-1 of IS 1893 (Part-1) 2016 is encountered then evaluation of liquifraction potential shall be assessed and remedial actions to be adopted shall be specified. (e) suitability of the soil for backfilling around foundations/ filling under the floors (f) Remedial measures against the presence of harmful chemicals in the sub soil/ ground water (g) Remedial measures for foundation footings, plinth beams and filling under floor in case of meeting expansive soils

Notes Contd…. 2. The soil investigation report should be vetted any IIT Chennai, IIT Mumbai, IIT Kharagpur, IIT Hyderabad, IIT Guwhati, IIT Bhubaneswar, NIT Trichirappalli, NIT Warangal, NIT Surakhkal, NIT Surat, Andhra university or Anna University chennai 3.CD Containing video evidence of depth of each bore hole & machinery deployed at site be kept in record. 4.The contractor shall submit 06 (Six) copies of the final soil investigation report in English language. The final soil investigation report shall include complete compilation and consideration of all available data, in-situ and laboratory tests conducted contractor’s interpretation and inference of result of shall in-situ and laboratory investigation. It shall include general description of site, geology of the area, soil investigation procedures, description and characteristics of soil and rock, sub soil conditions, description and results of all in-situ and laboratory tests.

B T NAVEENKUMAR