rock mechanics and acoustic emission ...mining.mst.edu/.../rock_mechanics_acoustic_emission.pdf331...
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![Page 1: ROCK MECHANICS AND ACOUSTIC EMISSION ...mining.mst.edu/.../rock_mechanics_acoustic_emission.pdf331 ROCK MECHANICS (I) (232 Statistics and Mechanics of Rock Materials) 1. Review of](https://reader031.vdocuments.us/reader031/viewer/2022021602/5e46d7ea25c14f7e3509c7b0/html5/thumbnails/1.jpg)
ROCK MECHANICS
AND
ACOUSTIC EMISSION/
MICROSEISMIC MONITORING
Maochen Ge
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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
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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
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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
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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)
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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
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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)
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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
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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
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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
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By 4:07 PM on Thursday, Water Stabilized in Pit at
about 1852’, 3 Diesel Pumps Operating ( ~15,000 GPM)
Preliminary and Conjectural Information Only
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Preliminary and Conjectural Information Only
The 6” Borehole is Drilled into
the Mine
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The Broken Drill Bit is Removed from the Borehole. Reaming
with a Slightly Larger Bit Begins at 8:40 PM on Friday
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Collar installed for 30” Rescue Borehole
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Briefings by MSHA, State, and Company Officials
were Conducted Regularly with the Families, and of
Course, with the Media
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ISS BASED VOID DETECTION TECHNIQUE
Void
Source
Data Acquisition System
Sensors
Trigger Line
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A close-up view of Love waves
Love waves
S7
S8
S10
S12
S13
S14
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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
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43
.19
E5
68
88
.26
E
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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
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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
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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.