A tunnel rock mass classification technique and its applicability using electrical resistivity and seismic wave velocity

23 4 56 7 89 10 112 13 1415 16

1x10⁰ 1x10¹ 1x10² 1x10³ 1x10⁴

Granite Rhy olite Tuff Andesite Basalt Sandstone Shale Chert Limestone Cry stalline schist M udstone Decomp osed granite soils Clay Landslide soils Weathered formations

Resistivity (ohm-m)

Data processor

Specimen holder Function

generator

Signal conditioner Data processor

Specimen holder Function

generator

Signal conditioner

Specimen

P C CP

Tap water

Spindle Spindle

Lid Filter papers

Specimen

P C CP

Tap water

Spindle Spindle

Lid Filter papers

10^-1 10⁰ 10¹ 10² 10³ Pore fluid resistivity (ohm-m) 10²

10³ 10⁴ 10⁵

Resistivity (ohm-m)

Measured values Archie's fomula Parallel resistances model

Velocity(km/s)

Depth(m)

Granite Sedimentary rock Measured Vel.

Calculated Vel.

Velocity(km/s)

Depth(m)

Granite Sedimentary rock Measured Vel.

Calculated Vel.

Resistivity

R.M.C.

Velocity

Resistivity

A : Seismic Velocity, B : Resistivity,

C : Actual support patterns, D : Estimated support patterns Tunnel route

Resistivity

R.M.C.

Velocity

Resistivity

A : Seismic Velocity, B : Resistivity,

C : Actual support patterns, D : Estimated support patterns Tunnel route