Provn of Central Engg Services at Jamnagar Military Station (AMWP 2020-21) (For Soil Investigation of sump well cum pump house)

Amount

Conducting Soil Investigation (bore hole) as per IS: 1892-1997 in the proposed site for under ground sump for intake & pump out rainwater, by manually/hydraulic/calax rotary drilling of 100-150mm diameter with casing pipe/bentonite slurry if required, for supporting inner collapsible stratum below water table with pot holes/helical auger in all sorts of soil up to depth of 15.0 Mtr for the proposed site and preparation of investigation report with proper recommendation of type of foundation to be adopted including safe load bearing capacity of soil. Investigation and report shall comprise fwgs Tests for working out safe bearing capacity of soil: 1) Bore Hole – 02 Nos. 2) Standard Penetration Test (SPT) – 02 Nos. Specification for carrying out soil investigation report shall include the following: (i) Drilling of Test boreholes of 150mm dia by shell and auger MS casing as per IS 1892-1979.

(ii) Standard Penetration Test (IS 2131 1981) conducted by means of the split spoon, specified in this standard, furnishes data about resistance of the soils to penetration which can be used to evaluate standard strength data, such as N values (number of blows per 30 cm of penetration using standard split spoon) of the soil. Methods of calculation of bearing capacity of soils based on N values as specified in 1S 6403-1981. The testing may be terminated earlier if N value reaches 50. (iii) Sub Soil Stratification: Based on field and laboratory test data stratification be enumerated for BH at various depth incl level of water table.

(vi) Sequence and extent of each soil and rock stratum in the region likely to be affected by the proposed work shall be enumerated in detail report incl nature of each stratum and engineering properties of soil and rock which may affect design and mode of construction of proposed structure and their foundation. (vii) Photographic record of geo-exploration as well testing shall form part of detail report to be submitted. (viii) Collection of disturbed/undisturbed sample as per IS-2132-1986 and carrying out laboratory test for the following: a) Sieve analysis b) Consolidation characteristics c) Particle size d) Wet and dry density e) Specific gravity, C value, moisture content etc. f) Plasticity index g) Natural moisture content h) Shear strength characteristics j) Swelling pressure and free swell index for clayey soils. k) Evaluation of safe bearing capacity based on shear failure and settlement failure criteria. Refer IS 1904-1986. IS 8009 Part 1 & 2. Allowable bearing capacity at various depths of 1.5 m, 2.0 m, 2.5 m, 3.0 m, 3.5 m and 4 m or more as required below GL is to be given with suggestion for economical width and type of foundation to be adopted. Recommended SBC shall be given for all bore holes. SBC should be worked out for fwg isolated footing of size 1.5m x 1.5m, 1.5 x 2.5m, 2.0m x 2.5m, 2.0m x 3.0m and 2.5m x 3.0m at each depth specified for working out SBC. l) Carrying cut swelling test soil

failure criteria. Refer IS 1904-1986. IS 8009 Part 1 & 2. Allowable bearing capacity at various depths of 1.5 m, 2.0 m, 2.5 m, 3.0 m, 3.5 m and 4 m or more as required below GL is to be given with suggestion for economical width and type of foundation to be adopted. Recommended SBC shall be given for all bore holes. SBC should be worked out for fwg isolated footing of size 1.5m x 1.5m, 1.5 x 2.5m, 2.0m x 2.5m, 2.0m x 3.0m and 2.5m x 3.0m at each depth specified for working out SBC. l) Carrying cut swelling test soil

m) Location of Ground water table (GWT) at peak dry and peak monsoon period be submitted in report. n) Recommendations as regards possibility of liquefaction of soil be given. o) Recommendation for suitability of earth obtained from foundation trenches for back filing and filling under floor also shall be given p) Possible corrosive effects of soil and water on foundation material.

NOTE : Records of Borehole and Trial Pits shall be made in a Plan and section, drawn to the largest convenient scale should be submitted. The following information shouId be shown in Plan : a) Name of Agency : b) Location with existing reference : c) Boreholes and Trial Pits with number : d) Reduced level (RL) of ground surface with reference to BM at each BH and Trial Pits : e) Date of explorations/site investigation started and Date of completion : f ) Name of Supervision staff of AGE (I) (A) Jamnagar :

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