Soil investigation for Provn of Four (ORP) Blast Pens with Link Taxi Track and allied works services at AF Stn Chabua.

Amount

BOREHOLES (21 Nos) The following works are to be carried out for sub surface investigation report:- (a) Boring through sand/clays/soft strata from ground level to 10 m depth or depth of refusal wherever is met earlier. (b) Conducting standard penetration test in the bore as per IS : 2131-1985 including collecting disturbed samples at every 0.5 mtr or change of strata including packing and handling all complete ,and collecting undisturbed soil samples at 1.0 mtr or change of strata including packing and handling all complete as per IS : 2132-1985. (c) Carrying out laboratory test for :- (i) Specific gravity, bulk and dry density. (ii) Grain size analysis. (iii) Natural Moisture content. (iv) Liquid and plastic limits, swelling index. (v) Shear characterstics of undistrubed samples using direct shear/triaxial shear test. (vi) Unconfined compression test. (vii) Consolidation test for consolidation properties. (viii) Chemical tests for availability of soluble chloride and sulphate.

(d) Subsurface investigation report to include clearly following parameters:- (i) Lay out of trial pits & bore holes on proposed site plan. (ii) Record of boring as per Appx 'D' of IS 1892. (iii) Soil/Rock Properties as per detailed exploration ( Table 3 of IS 1892 and sub para vi above). (iv) Soil properties based on above field tests. (v) 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 mtr, and 2 mtr as required below GL is to be given with suggestion for economical width and type of foundation .The report shall be include detailed calculations for SBC. In case of low bearing capacity recommendation may be include bearing capacity calculation SBC & Settlement calculation for raft foundation also. (vi) Recommendation for pile with pile capacity in case weaker strata is encountered. (vii) Other relevant recommendations for foundation and improvement of soil if necessary. (viii) Recommendation of existing soil for backfill purpose. (e) Testing method shall be strictly in accordance to relevant IS code. Notes : (i) All the reports/results will be got vetted from any of the IIT's or Govt Engineering Colleges. (ii) Submission of (04) four copies of test report with detailed description for field investigation as mentioned above shall be submitted by contractor.

CARD HOUSE

S.G. Foundation & Engineers