rock mechanics and acoustic emission ...mining.mst.edu/.../rock_mechanics_acoustic_emission.pdf331...

ROCK MECHANICS

AND

ACOUSTIC EMISSION/

MICROSEISMIC MONITORING

Maochen Ge

TEACHING

• Mi Eng 331 Rock Mechanics (I)

• Mi Eng 332 Soils and Overburden Materials

• Mi Eng 432 Rock Mechanics (II)

• Mi Eng 235 Underground Mine design

• Mi Eng Geostatistics

331 ROCK MECHANICS (I)(232 Statistics and Mechanics of Rock Materials)

1. Review of fundamental mechanics principles

2. In situ stresses

3. Basic rock mechanics instrumentation

4. Rock properties

5. Field instrumentation

6. Pillar design

7. Roof span design

8. Rock reinforcement

9. Surface subsidence

10. Rock burst

11. Slope stability

TEACHING






332 SOILS AND OVERBURDEN MATERIALS

1. Soil classification

2. Effective stress and pore pressure

3. The movement of water through soil

4. Shear strength and failure criteria

5. Compaction, settlement in soils

6. One dimensional consolidation

7. Bearing capacity of shallow foundations

8. Stability of earth slopes

9. Retaining walls

10. Waste impoundments

11. Surface mine reclamation (backfilling, grading of spoil, etc)

TEACHING






432 Rock Mechanics II

1. Rock slope engineering (basic mechanics of slope

failure, stereonet graphical method, Shear strength of

rock, groundwater flow, plane failure, wedge failure,

circular failure)

2. Rockmass classification and empirical methods of

design (Terzaphi’s rock load classification,

Geomechanics classification, Q-system)

3. Rock support principles and methods (Mechanics of

rock-support interaction, mechanics of rock bolts,

design guidelines for rock bolt systems)

4. Rock dynamics (waves and vibration, blasting

monitoring, rockburst and seismicity, geophysical

methods for ground control)

Rock Mechanics Laboratory

1. Rock specimen preparation room and equipments (core drill, diamond

cut-off saw, surface grinder) need to be repaired and updated.

2. Two test machines, TerraTek and Tinius-Olsen in B28 need to be

calibrated and documented.

3. New instruments for strain gage installation and measurement (Strain

Gage Bridge, Strain Gage Switching and Balancing Unit, Instrumented

Cantilever Beam) need to be purchased.

4. New devices for indirect compressive strength testing (point load

tester and National Coal Board Cone Indenter) need to be purchased.

5. Underground measurement devices (tape extensometer, etc) need to be

purchased.

6. Instruments for demonstration purposes (load cells, LVDT, vibrating gage,

etc) need to be purchased.

7. Rock bolts and cables for demonstration

Research

1. Rockburst and microseismic monitoring

(Homestake, Creighton, Campbell Red Lake, Kidd

Creek, North Mine, Sigma, Chimo, Copper Rand,

Springfield Pike Mine)

2. Void detection

3. Geotomography

4. None destructive testing

By 9:15 AM, Water begins to flow

out of Portals, Water Level at 1836’,

1st Left Potentially Under Water

Diesel Pumps Installed

Preliminary and Conjectural Information Only

By 4:07 PM on Thursday, Water Stabilized in Pit at

about 1852’, 3 Diesel Pumps Operating ( ~15,000 GPM)



The 6” Borehole is Drilled into

the Mine

The Broken Drill Bit is Removed from the Borehole. Reaming

with a Slightly Larger Bit Begins at 8:40 PM on Friday

Collar installed for 30” Rescue Borehole

Briefings by MSHA, State, and Company Officials

were Conducted Regularly with the Families, and of

Course, with the Media

ISS BASED VOID DETECTION TECHNIQUE

Void

Source

Data Acquisition System

Sensors

Trigger Line

A close-up view of Love waves

Love waves

S7

S8

S10

S12

S13

S14

Applications in trona mines- Monitoring barrier pillars

270 ft

R5

N34882.65

9xc

10xc

11xc

66'61'

47'

N34869.23 N34871.54

E5

713

1.2

9 E

57

137

.28

E5

72

20.8

7

E5

72

68

.87

E

57

23

2.6

5

E5

72

44

.87

E

57

25

6.8

7

N34889.65 N34889.65 E

5699

3.2

6

E

57

011.2

6 E

57

021.5

7

E

57

038

.76

E

57

05

7.3

2

E

57

073

.14

E

57

090.3

2

E5

7107.4

2

E5

7005.2

6

E

57

027

.26

E5

7044

.26

E

5706

2.1

3

E

57

080.0

1

E5

709

4.4

5

E5

713

9.0

6

E5

712

8.8

3 E

57

134

.33

E5

69

36

.26

E5

69

48

.69

E5

69

43

.19

E5

68

88

.26

E

56

89

4.2

5

E5

7180.8

0

E5

716

8.2

2

N35133.12

E57

03

7.9

8

N35116.35 E

57

001.0

8

N35115.93 E5

69

57

.97

N35107.23

E

56

913

.88

N35080.84

E5

69

36

.24

N35153.86

E5

72

39

.00

N35130.00

N35104.86

N35118.56

PAST RESEARCH

1. Rockburst and microseismic monitoring

(Homestake, Creighton, Campbell Red Lake, Kidd

Creek, North Mine, Sigma, Chimo, Copper Rand,

Springfield Pike Mine)

2. Void detection

3. Geotomography

4. None destructive testing

PANNED RESEARCH

1. Catastrophic failure in mines,

2. mapping of fracturing process for natural

gas recovering,

3. safe CO2 sequestration, and

4. structure integrity and aging

infrastructures.

rock mechanics and acoustic emission ...mining.mst.edu/.../rock_mechanics_acoustic_emission.pdf331...

Documents