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Down-hole/cross-hole tests. Down-hole/cross hole tests are in-situ test methods - to measure dynamic soil/rock properties - to determine P-wave and S-wave velocities - to identify soil stratification - to determine shear modulus, G = r. v s. Down-hole/cross-hole/krishna Aryal.

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Down-hole/cross-hole tests


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down hole cross hole tests
Down-hole/cross-hole tests
  • Down-hole/cross hole tests are in-situ test methods

- to measure dynamic soil/rock properties

- to determine P-wave and S-wave velocities

- to identify soil stratification

- to determine shear modulus, G =r.vs

Down-hole/cross-hole/krishna Aryal

slide2

Surface source

S-wavearrival time, t

vs = dz/dt

Layer 1

Transd. 1

Layer 2

Transd. 2

Depth, z

Down-hole Seismic test

Down-hole/cross-hole/krishna Aryal

down hole test

Receiver

Source of impulse

Receiver

Source of impulse

a) Down-hole test

b) Up-hole test

Down-hole test

Down-hole/cross-hole/krishna Aryal

cross hole test

Source

Receiver

L

Cross-hole test

2 boreholes arrangement

Down-hole/cross-hole/krishna Aryal

cross hole test5

Source

Receivers

L

Cross-hole test

3 boreholes arrangement

Down-hole/cross-hole/krishna Aryal

down hole testing
Down-hole testing

Down-hole/cross-hole/krishna Aryal

results
Results

P and S-waves are determined from the t-z plot

Down-hole/cross-hole/krishna Aryal