Consultancy Services for soil investigation and counter survey for Provn of Defi Md Accn for 40 OR at Jamnagar Mil Stn

Amount

1.Conducting soil Investigation (bore hole) as per IS : 1892-1997 in the proposed site for Defi 40 Ors Md Accn coprising 06 Block of Triple storeyed and 01 Block of Double storeyed, 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 10.0Mtr 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 - 07 Nos. (2) Standard Penetration Test (SPT) - 07 Nos. (3) Trial Pit of size 1.2 x 1.2m of appropriate depth at a distance of 5m away from each Boreholes (as per IS 1982-1979) -07 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 30cm of penetration using standard split spoon) of the soil. Methods of calculation of bearing capacity of soils based on N values as specified in IS 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.

(iv) 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.

(v) Photographic record of geo-exploration as well testing shall form part of detail report to be submitted.

(vi) 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 1.5m, 2.0m, 2.5m, 3.0m, 3.5m and 4m 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, 1.5m 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 out 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 should 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.

2. Conducting Contour Surveying by Total Station instrument and plotting Contour Map showing Reduced Levels in grids of 3m interval on either direction including marking all existing adjacent structure and services (like roads, external electricity cables, path, culvert, drain, sewage lines, fencing/ Bdy walls, etc). Approx plot area to be surveyed is 70 x 80m (5600 sqm). (Note: Contour Map in soft/hard copy shall be submitted in 03 Copies)

Geo Designs n Research Pvt Ltd

Unique Engineering Services

AHMEDABAD ENGINEERING RESEAERCH INTITUTE