82561 SOIL INVESTIGATION FOR RECONSTRUCTION OF EXISTING LOW COMPOUNDED BOUNDARY WALL TO HIGH SECURITY BOUNDARY WALL AT VELLACHI UNDER AGE(I) NAVY CHENNAI

Amount

SCHEDULE 'A' PART-I

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 hrad 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) Drilling in hard rock/fractured rock shall be measured and paid under item No.4 (ii) In case of meeting boulders, the boring beyond boulder depth shall be measured under this item. iii) In case o f non - Feasibility of collection of undisturbed soil sample, disturbed soil sample shall be collected, duly recording the reason

Driling bore holes in hard rock/fractured rock using hydraulic drilling machine within the borehole for cutting cores in rock and collection of cores of requiste size and length as per relevent IS Standards. Drilling shall continue till minimum 5 m into hard rock starta.

Conduct of following laboratory tests on rock samples/cores collected from boreholes as per relevant Indian standards (see IS 2720(all parts) and IS 1498, IS 9143 , IS 13030 , IS 9221, IS 8764 , IS 9179 , IS 10050, IS 10082 , IS 10782 , IS 12608, IS 13047, IS 3025 a) Visual Classification ; b) Density : c)Specific gravity : d)Hardness : e) Degree of weathering f) Uniaxial Compression test (both saturated and unsaturated) g) Point load strength index; h) RQD (Rock Quality Designation) Note : (i)Item to be operated only in case of encountering rock in bore hole with the written permission of AGE(I) (ii) This is compulsory item for the case where pile foundation is anticipated.

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 undisrtubed 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 outline of proposed structures duly marked, 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. k)In case of pressure meter tests the following should be furnished

Notes Conte…. 1.2.1 Reporting of in-situ and laboratory test results should be in accordance with relevent Indian Standards. 1.3.1 Analysis and Interpretation of Results. The following shall be included in the report: a) Analysis of test results. B) Discussion and interpretation of results analyzed including basis of adopting design parameters for the substrata, c) For Shallow foundations (i) Net allowable bearing pressure consedering shear, settlement criteria as well as SPT value for isolated footing continuous strip footing andraft foundation at depth 1.5 mtr, 2.0 mtr, 2.5 mtr and 3.0 mtr. For calculations IS 6403 shall be used. (ii) Modulus of subgrade reaction and modulus of elastricity of substrata. (iii) In case of UG Sump/ Swimming pools/ RCC Septic Tanks K Value from 0.50Mtr to 5.0 Mtr depth. (iv) Table showing the factors considered for calculation of SBC shall from part of the report. All references to relevant tables/charts/clauses of IS code shall be mentioned. d) For pile foundations safe load carrying capacity (Compression, Pull out and Horizontal with free head as well as supported head pile load capacities shall be worked out for 300, 400, 450 & 500 for under reamed piles and for 450, 500, 550, 600, 700 & 750 dia for end bearing piles. (i) The actual crushing strength (uniaxial compression test) of rock sample shall be used for calculation of pile capacity

Notes Conte…. (ii) A table showing the factors considered for calculation of pile capacity shall form part of the report. All references to relevant tables/charts/clauses of IS code shall be mentioned. (iii) The depth of fixity of pile shall be calculated and calculations shall be mentioned. (iv) Requiremnt of permanent liner including required depth shall be part of the report. (v) The minimum socket depth at the end of pile shall be mentioned (vi) Vertical Load capacity duly considering soil liquefaction analysis, compressive strength of Rock core recovered determined from lab tests, reduction in skin friction due to permanent liner. All calculations shall be part of report. (vii) Lateral Load capacity duly considering Soil liquefaction analysis. Lateral load capacity shall be calculated for both fixed top condition as well as free top condition. All calculations shall be part of report. (viii) Pull out capacity duly considering negative eskin friction due to expansive nature of soil. (ix) Depth of socketing in Hard rock/fractured rock (x) Requirement of permanent liner. (xi) Recommended Pile Penetration Ratio (PPR) in KNm/m2/cm and Rate of penetration (cm/min) for given torque and RPM at termination level.

Notes Conte…. e)If weak soil with lesser N value as specified in table -1 of IS 1893 (Part-1) 2016 is encountered then evaluation of liquefraction potential shall be assessed and remedial actions to be adopted shall be specified. F)Suitability of the soil for backfillig arround foundations/ filling under floors. g)Susceptibility of sub soil strata to liquefration, if any, in the event of dynamic loading and requisite remedial measures. h)Remedial measures against the presence of harmful chemicals in the sub -soil/ ground water j)Remedial measures for foundation footings, plinth beams and filling under floor in case of meeting expansive soils. 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 and 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.

Myrtle project and Consultancy Private Limited