Presentation-2 - IIT Kanpurhome.iitk.ac.in/~sarv/New Folder/Presentation-2.pdf · Site...
Transcript of Presentation-2 - IIT Kanpurhome.iitk.ac.in/~sarv/New Folder/Presentation-2.pdf · Site...
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Site investigation boreholesSite investigation boreholes• Percussion drillingg
– soils/soft clay rocks– core recovery
R t i• Rotary coring– soil or rock >100m deep– core recovery
• Rock probing– rotary percussion rig
soil or rock– soil or rock– no core recovery
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Rotary rigRotary rig
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Core bitCore bit
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Core drillingCore drilling
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Rock coreRock core
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Total Core Recovery (R)Total Core Recovery (R)
drilledLengthrecovered core oflength Summed R =
Depends upon:
drilledLength
Depends upon:• quality of the rock mass?
t bilit f/l k f ib ti i th d ill i• stability of/lack of vibration in, the drill rig • choice of core barrel/skill of the operator
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Rock Quality Designation (RQD)M difi d C Ror Modified Core Recovery
xRQD iΣ=
LQ
xi = lengths of individual pieces of core ≥ 10 cm i g p
L is the total length of the drill run
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Indirect Methods of determination f RQFof RQF
Seismic Method -Seismic Method RQD= (Vf / Vl )2 * 100
R ti f l it i th fi ld t th t i th l bRatio of velocity in the field to that in the labVolumetric Count -RQD = 115- 3.3* Jv
where J is a measure of number of jointswhere Jv is a measure of number of joints within a unit volume of rock mass
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