Soil investigation and Structural design in r o Provn of Deficient Married Accn at AF Stn Dinjan under GE AF Mohanbari

Amount

Standard Penetration Test : - Mobilization charges of tools & plants alongwith accessories, materials, labour, supervision etc at site of work required in connection with boring & testing work, including setting up boring rigs etc and also incl withdrawl of same from the site after completion of work, complete all as directed and as speified below:- (a) For sub surface investigation soil exploration shall be carried out as per IS 1892 : 2021 or latest amended/revised codes of practice for sub surface investigation for foundation, IS 10042 : 1981 (Reaffirmed 2002) or latest amended/revised code of practice for soil investigation for foundation in Gravel-Boulder Deposit. (b) Boring of 150mm dia to be carried out through any type of sub soil stratas from ground level to ______15______mtr (N>50) or (Depth of refusal wherever is meet earlier). If refusal encounters before mentioned depth of bore, another bore shall be carried out at a radial distance of 2mtr. If refusal encounter continues on the next location, it shall be carried out upto total 04 Nos of bores to eliminate the probability of local refusal due to boulders/pebbles without any extra cost to the department. (c) Conducting standard penetration test in the bore as per IS 2131-1985 including collecting disturbed samples at every 0.5mtr or change of strata including packing and handling all complete and collecting undisturbed soil samples at every 1.0 mtr or change of strata inclding packing and handling all complete as per IS 2131-1985. (d) Carrying out laboratory test for:- (i) Specific gravity, bulk density, dry density. (ii) Maximum dry density and Optimum Moisture Content (Modified Proctor Density Test). (iii) Grain size analysis. (iv) Natural moisture content . (v) Atterberg limits test (Liquid Limit, Plastic Limit, Shrinkage Limit). (vi) Shear characterisitc of undisturbed samples using Direct ShearTest and Triaxial Shear test. (vii) Unconfined Compression Test. (viii) Consolidation test. (ix) Chemical test for availability of soluble Chloride, Sulphate, Carbonate, Nitrate content and PH value of Sub-Soil, Ground Water & Sub-Soil Water. (ix) Free swell index and swelling properies of soil. (x) Harmful Salt. (xi) Organic matter in soil if any. (xii) Ground water table & HFL test as per under to be mentioned in the soil report:- * Maximum and minimum level of ground water in the area with source of information. * Ground water table observed during the investigations. (xiii) Angle of internal friction. (xiv) Coefficient of internal friction.

Open Pit Excavation/ Trial Pit :- Carrying out Open Pit / Trial Pit Excavation Test by digging a trial pit of size 3m x 3m x 4m deep as per location shown by Engr-in-Charge for visual inspection of the strata, collection of disturbed/undisturbed samples and carrying out in-situ test using accessories, materials, labour, supervision etc as reqired at site of work & testing work and also incl withdrawl of same from the site after completion of work, complete all as directed and as speified. After the pit is excavated, the details of the stratas shall be recorded with the description of each layer with thickness and ground water table, if any. After collecting the samples/in-situ testing, the pit shall be backfilled with the same excavated material. Arrangements shall be made for dewatering below ground water table. Precautions shall be taken to prevent surface water draining into the trial pit.

Plate Load Test :- Conducting plate load test at place below the existing ground surface as directed by Engr-in-Charge for estimation of bearing capacity of soils and its settlement as per IS 1888 and for determination of Modulus of Subgrade Reaction (K- value) as per IS 9214 using accessories, materials, labour, supervision etc as reqired at site of work & testing work and also incl withdrawl of same from the site after completion of work, complete all as directed and as speified.

Notes: - (a) Suburface Investigation Report shall include clearly following parameters:- (i) Introduction (ii) Object of the geotechnical investigations. (iii) layout of bore holes on proposed site plan with their latitude, longitude and level wrt esablished permanent BM. (iv) Record of boring as per format provided at IS 1892:2021. (v) Soil/Rock properties as per detailed exploration (As per Cl. No. 4.4 of IS-1892:2021). (vi) Borelog / Trial Pit log (As per format provided at Fig. 4 of IS 1892:2021). (vii) Plan showing location and depth of in-situ tests. (viii) Geological information of the area. (ix) General Topography of the site. (x) Past usage and historical data of the site, if available. (xi) In-situ test results. (xii) Plot of standard penetration test (N values both uncorrected and corrected) with depth of identified areas. (xiii) Laboratory test results (As per format provided at Fig. 5 of IS 1892:2021) (xiv) Summary of strata profile. (xv) Soil properties based on above field test. (xvi) Evaluation of safe bearing capacity based on shear failure criteria (Ref IS:1904:1986 or latest amended/revised codes) & (IS:8009 Part I & II). Allowable bearing capacity at various depths of 1.5mtr, 2.0mtr, 2.50mtr and 3.0mtr or as reqd below GL is to be given. The suggestion for economical width and type of foundation also to be provided. The report shall include detailed calculations for SBC. In case of lower bearing capacity, calculation of SBC & Settlement calculations for raft foundation also to be provided. (xvii) Recommendation for pile foundation with pile capacity in case weaker strata is encountered. In case of weak soil strata / filled up earth requiring pile foundation, depth of soil investigation is to be increased suitably. (xviii) Allowable bearing capacity-based on SPT 'N' value, 'c-Ø' value and permissible settlement with sample calculations. Complete calculations will be submitted in soft copy in the same CD contating the SSI report. (xix) A detailed site plan showing the location of each bore hole duly numbered corresponding to the type of structure with its brief details like LxBxH & configuration should be enclosed with soil invsetigation report. Location of foundation of adjacent structures, especially those that might be impacted by the proposed construction should be indicated with details in site plan. (xx) Liquefaction analysis to be enclosed with the soil investigation report. (xxi) Suitability of excavated earth / soil for back fill to be given in the report. (xxii) Photographic record of geo-explorations as well as testing shall also be attached as part of the report. (xxiii) SBC should be calculated and provided for all types of foundations i.e. strips, isolated, raft footing and deep foundation as required accordingly. (xxiv) Recommendations of building wise net safe bearing capacity has to be furnished in the report. It is advised to give recommendations of Net Safe Bearing Capacity for specific buildings/structures duly taking into consideration soil data/profile of all bore holes in that particular building. (xxv) Net safe bearing capacity for different type, size and depth of foundation is to be given in following format:- (a) Isolated Footing:-

(xxvi) Other relevant recommendations for foundations and improvement of soil if necessary. (B) Report shall be submitted as per sample proforma attached. (C) Testing method shall be strictly in accordance to relevant IS code : 2720. (D) In case of hilly terrain and location of site on hill slope, soil investigation agency shall look into the stability of slopes and give suitable recommendations to avoid slope failure at later stage. (E) All pages of the soil investigation report shall be serially numbered, stamped and signed by the agency carrying out the soil investigation. (F) Six copies of ink signed report duly scruitinised and vetted by IIT shall be submitted with detailed description of field investigations carried out, soil classification and general nature of soil strata, water table, interpretation of test results, grain size distribution curves, compressive index curves, site plan etc as listed in preceding paragraphs. (G) CWE and GE shall scrutinize the soil investigation report and endorse the same for correctness. GE, Engr-in-Charge and JE shall note 'N' value logg and general soil profile as noticed during Field Test (H) Soil Investigating Agency may be required to render any clarification sought by the department on the Soil Investigation Report submitted by them at any stage till completion of the construction work.

S.G. Foundation & Engineers (BID ID -3285753)

CARD HOUSE (BID ID -3287274)