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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

Topic 1

Geotechnical




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)



Loose Lift Thickness: Max 12” / Min 8”

Retest

PASS FAIL No.

X

X

X

X

X 6

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 face Lift Elevation

Sta 9+50 / 14 ft 272.0

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)




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)





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