Soils&FoundationPPT

Soils&FoundationPPT - Dr. Larry Muszynski RNK 327...

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Dr. Larry Muszynski RNK 327
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Soils Structural integrity of a building depends on the material that supports its foundations. Type of soil Non problem soils Problem soils Subsurface investigation destructive non-destructive
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Bearing capacity of the soil Soil compaction methods Effects of groundwater Dewatering methods Foundations Shallow Pile
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Soils Labs Soil Classification Sieve analysis Atterberg test Soil Compaction Proctor test Field Compaction Sand-Cone Test
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Weathering Profile
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METHODOLOGY Reconnaissance preliminary examination including: geologic data- topographical information groundwater table information underground utilities Borings - drilling holes in the ground Sampling - removing soil from the hole Testing - characteristic properties of the soil
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Contractor Decisions: boring spacing 50 - 100 ft. for multistory buildings 100 - 200 ft. for single story buildings 500 - 1000 ft. for highways. boring depths boring should go deeper than the depth of unsuitable soil into suitable or compacted soil. (Footing width) for tall structures borings should go into bedrock
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Sampling Removing samples from bored holes - every 5 ft. in depth of the boring hole. disturbed auger and wash borings core borings soil grain analysis, liquid limit, plastic limit, specific gravity and compaction. undisturbed test pit "carving" "Shelby tube" extraction strength, compressibility and permeability
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Groundwater table Soil bearing capacity reduced when the water table is near the the footing. Reduction in foundation stability structures float out of ground (high ground water table) hazardous or toxic waste landfills - contamination Location of water table existing wells boring holes level to which groundwater rises in a boring hole is the groundwater elevation in that area.
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Testing Standard Penetration test Cone Penetration test
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Standard Penetration test
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Standard Penetration Test (SPT) Cohesionless soil- cohesive soil Split spoon sampler 2" o.d. x 1-3/8" i.d tube, 18 to 24 in long split longitudinally 140 lb hammer falling 30" to drive spoon 18" into the soil No. of blows required to penetrate each of the three 6-inch increments is recorded separately. Standard penetration resistance value (N-value) is the number of blows required to penetrate the last 12-inches, N in blows/ft) Remove "disturbed" sample for further testing
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Con't SPT results affected by overburden pressure effective wt. of overlying soil. Correction factor, C(n) C n = 0.77(log (20/p o ) N corr = N * C n
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Cohesionless Soil Relative Density N(corr)-value Very loose 0-4 Loose 4-10 Medium 10-30 Dense 30-50 Very Dense >50
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Cohesive Soil Consistency N(corr) Value Very soft <2 Soft 2-4 Medium 4-8 Stiff 8-15 Very stiff 15-30 Hard >30
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Cone Pentration Test (CPT) Mechanical cone penetrometer 60 degree angle 1.41 in. base diameter 1.55 sq. in. base area
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This note was uploaded on 02/23/2012 for the course BCN 1210 taught by Professor Fobair during the Spring '09 term at University of Florida.

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Soils&amp;amp;FoundationPPT - Dr. Larry Muszynski RNK 327...

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