CONSULTANCY SERVICES FOR SURVEY AND DETAILED SOIL INVESTIGATION FOR PROVISION OF ADVANCED TRAINING WORKSHOP FACILITY AT INS VISHWAKARMA AT VISAKHAPATNAM

Mobilisation of equipment for detailed soil Investigation and shifting them location to location of bore holes and for in-situ tests.

Boring holes 150mm dia in any types of soil but excluding any type of rock upto a depth of minimum 20m in case of good soils in which open / raft foundation is anticipated to be sufficient, in case of meeting rock strate within 15m or meeting weak soils in top in which case pile foundation is anticipated minimum 6.5m below the rock stratak for conducting following activities: (a) Conduct of SPT at every 1.5 mtr interval or change of strata whichever occurs earlier. (b) Collection of undisturbed soil sample (UDS)incase of cohesive soil samples(or disturbed sample in case of non cohesive soils at every 1.5 mtr interval or change of strata whichever occurs earlier (a minimum gap of 500 mm shall be ensured between SPT and collection of UDS in case of cohesive soils or collection of disturbed samples in case of noncohesive soils. Note:- (i) Written permission of CWE shall be obtained for deep boreholes when pile foundation is contemplated. (ii) In case of deep boreholes anticipating pile foundation at least boreholes in all 4 corners of the building shall go upto 6.5m below rock strata.

Drilling holes in any type of rock (Soft/Hard) using hydraulic drilling machine within the bore hole for cutting cores in rock and collection of cores of requisite size and length as per relevant IS Standards. Logging core Recovery Drilling shall continue till minimum 5 mtr into hard rock strata. Conduct of following laboratory tests on rock samples/ corres 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) Slake durability / degree of weathering f) Uniaxial compression test (crushing strength) (both saturated and unsaturated): g) Point load strength index ; h) RQD (Rock Quality Designation) Note: Item to be operated only in case of encountering rock in borehole with the written permission of GE. Note for (b) and (c) : As the project site is a low-lying and water-logged area with water depth up to 1.00 mtr, movement and mobilisation of drilling equipment for bore hole works is not feasible under existing site conditions.Therefore Make necessary arrangements for filling moorum and forming a temporary access path to facilitate safe mobilisation of machinery and shifting them location to location of bore holes.(The size of Advanced training workshop is 65X25 Mtr).

Conduct of following laboratory tests as per relevant Indian Standards (IS 2720 all parts, IS 1498 and IS 3025) on soil samples collected:- (a) Test on disturbed samples / undistrubed soil samples:- (i) Visual and engineering classification. (ii) Sieve analysis and hydrometer analysis. (iii) Atterberg limits (liquid limit, plastic limit and shrinkage limit). (iv) Specific gravity. (v) Free swell index. (b) Test as on Undisturbed samples :- (i) Bulk density and moisture content. (ii) Unconfined compression test (on remoulded undisturbed sample) (iii) Swelling Pressure (on remoulded and undisturbed sample) (iv) Determination of C&O values using direct shear (drained/ undrained) ( on remoulded or undisturbed sample ) or triaxial compression tests (on undisturbed or remoulded samples or vane shear test) or vane shear test.

Chemical analysis of ground water sample collected after 24 hrs of equalization at bottom of one bore hole.

Chemical analysis of soil samples one each from each strata in respect of one bore hole If different strata (s) encountered in any other borehole additionals soil samples to be analysed.

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. 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 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 GE and Geo Consultant; d) Past usage and historical data of the site, if available. Information regarding flooding of the site in the past, High flood level etc. e) Borelog and trial pit log duly signed by Geo Consultant. f) 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 1.2.1 Reporting of in-situ and laboratory test results should be in accordance with relevant 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 considering shear, settlement criteria as well as SPT value for isolated footing, continuous strip footing and raft foundation at depth 1.5 m, 2.0 m, 2.5 m and 3.00 m. For calculations IS: 6403 shall be used. ii) Safe Bearing Capacity determined for allowable settlement based on Plate load test in accordance with IS 1888-1982. 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, 600, 750 dia for end bearing piles. e) Dynamic soil properties such a shear wave velocity, dynamic shear modulus, Poisson's ration, damping ratio as applicable. f) Suitability of the soil for backfilling around foundations/ filling under floors. g) Susceptibility of sub-soil strata to liquefaction, if any, in the event of dynamic loading h) Remedial measures against the presence of harmful chemicals in the sub-soil/ground water i) Remedial measures for foundation footings, plinth beams and filling under floors in case of meeting expansive soils. 1.4 The soil investigation report should be vetted by any IIT/NIT/Andhra University. 1.5 CD Containing video evidence of depth of each bore hole & machinery deployed at site by kept in record. Undisturbed samples shall also be collected @ 1.5 m interval or change of strata. However there shall be minimum gap of 500mm between SPT and collecting UDS.

Topographical survey with 3m grid interval and 0.50m counter intervals to provide with accurate base line date with all existing permanent infrastructure /utilities, details of proposed site including reconnaissane to get broad view of entrance area for planning (using total station) including submission of site plan with grid levels, contours, existing features with soft copies and hard copies, preperation and calculation of quantities of cutting/filling MGL as specified by Engineer-in-Charge.