Session 3
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Session 3 Site Conditions PowerPoint PPT Presentation


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Session 3 Site Conditions. Topic 1 Geotechnical. Test Boring Logs. Laboratory Test Results. Moisture density test (proctor). “The perfect dirt ball”.  d MAX. Dry Unit weight (  d ). Dry & crumbly. Wet & mushy. OMC. Moisture Content (MC).

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Session 3 Site Conditions

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Session 3 site conditions

Session 3

Site Conditions

Topic 1

Geotechnical


Test boring logs

Test Boring Logs


Laboratory test results

Laboratory Test Results


Moisture density test proctor

Moisture density test (proctor)

“The perfect dirt ball”

dMAX

Dry Unit weight (d)

Dry & crumbly

Wet & mushy

OMC

Moisture Content (MC)


Session 3 site conditions

Required dry unit weight = 121.3 pcf x 0.95 = 115.2 pcf

Acceptable MC =

10 – 12%


Session 3 site conditions

Loose Lift Thickness: Max 12” / Min 8”

Retest

PASSFAILNo.

X

X

X

X

X6

X

SPECIFICATION REQUIREMENTS

Material type: MSEW soil; MSE wall “D”

Required % Compaction: >90% Max dry density

Required Moisture Range: +/- 5% of OMC

Test Location

Sta # / Distance (ft)

From MSE faceLift Elevation

Sta 9+50 / 14 ft272.0

See page 7.4-36


Compaction control for oversize material

Compaction control for oversize material

  • For soils with up to 30% retained on the ¾” sieve.

    Standard proctor with oversize correction

  • For soils with more than 30% retained on the ¾” sieve

    “For backfills containing more than 30 percent retained on the 19 mm sieve, a method compaction consisting of at least four passes by a heavy roller shall be used.”


Description of subsurface conditions

Description of Subsurface Conditions

  • Represents the geologist/engineersinterpretation of the logs and tests

  • May be presented as a subsurface profile drawing


Conclusions and recommendations

Conclusions and Recommendations

  • Are based on description of subsurface conditions

  • Are what the design should have been based on


Soils

Soils

  • Coarse grained (Cohesionless soils)

  • Fine Grained (Cohesive Soils)


Coarse grained soils identified by grain size

POWDERED

SUGAR

Coarse Grained Soils (Identified by grain size)

Boulders

>305 mm

(>12”)

Cobbles

76 -

305 mm

(3 -12”)

Gravel

4.76 -

76 mm

(#4 – 3”)

Sand

0.074 -

4.76 mm

(#200 - #4)


Fine grained soils identified by behavior

Fine Grained Soils(Identified by behavior)


Soil classification systems

Soil Classification Systems

  • USCS

  • AASHTO


Session 3 site conditions

Rock


Rocks are identified by origin and type

Rocks are Identified by Origin and Type

Igneous Rock:

Granite, Diorite, Basalt

Sedimentary Rock:

Sandstone, Limestone, Shale

Metamorphic Rock:

Gneiss, Schist, Quartzite


Standard penetration test

140 lb Hammer dropping 30”

4 blows for 6”

7 blows for 6”

6 blows for 6”

SPT Resistance

(N-value) =

7 + 6 = 13

Standard Penetration Test


Split spoon

Split Spoon

Vent

Sampler Head

Ball Check Valve

Split Barrel

Sampling Tube

Driving Shoe


Consistency fine grained soils

Consistency(Fine Grained soils)


Strength hardness

Strength/ Hardness


Recognition of a water problem

Recognition of a Water Problem


Impacts of groundwater

Impacts of Groundwater


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