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PHMP 003 - Slope Stability > Slope Stability - S105-107 > Flashcards

Slope Stability - S105-107 Flashcards

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1
Q
A
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2
Q

What is the purpose of collecting geological and geotechnical data in mining operations?

A

The data is used to manage geotechnical risk and should be included in geological and geotechnical models, updated as required.

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3
Q

What should be done if a gap in geotechnical data is identified?

A

The risk should be quantified, and further data acquisition should be undertaken to reduce the risk.

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4
Q

What types of additional data may be collected for geotechnical characterization?

A

Additional data may include geological and structural mapping, borehole logging, geotechnical mapping, strength testing, and groundwater measurements.

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5
Q

What is the Geotechnical Reference Report (GRR)?

A

The GRR describes the geotechnical characterization of the Blair Athol deposit and is used for developing geotechnical criteria and parameters for mine planning.

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6
Q

Who owns the Geotechnical Reference Report?

A

The GRR is owned by the Technical Services Manager.

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7
Q

How often should the Geotechnical Reference Report be reviewed?

A

The GRR should be reviewed annually to incorporate new data from field activities, laboratory testing, or site events.

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8
Q

What types of information should be maintained in geotechnical databases?

A

Geotechnical databases should store discontinuity information, estimated rock mass strength, test results, and other data required for geotechnical analysis.

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9
Q

What is the minimum Factor of Safety (FoS) for designs at BAC?

A

The minimum FoS for all excavated and dumped slopes is 1.20.

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10
Q

What happens if a design is assessed to have a FoS below 1.20?

A

The design must be modified or revised according to geotechnical advice to meet the acceptance criteria.

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11
Q

What process is undertaken if a design cannot achieve the minimum FoS?

A

A specific risk assessment process will be conducted, involving relevant stakeholders, including the appointed Geotechnical Expert.

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12
Q

What should excavation and dump designs comply with?

A

Excavation and dump designs should be carried out in accordance with the geotechnically reviewed and RPEQ approved geometry and relevant design assumptions detailed in the appropriate Geotechnical Design Sheets (GDS) for the mining area.

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13
Q

What is required for each slope design?

A

Each slope design is required to be assessed against the geotechnical design assessment form to identify anything that is outside of the approved design or slope design assumptions.

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14
Q

What may indicate non-conformance in slope design?

A

Non-conformance may include a change in slope configuration, change in expected geology or structure, hydrological conditions, etc.

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15
Q

Who should assess any non-conformance?

A

Any non-conformance should be provided to an REQ registered geotechnical engineer for assessment and approval.

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16
Q

What document is referenced for the Geotechnical Design Checklist?

A

TMS-BAC-PHMP-003-FRM-001 Geotechnical Design Checklist

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17
Q

Who must approve excavation work?

A

All excavation work shall be carried out with an approved design that has been signed and approved by the Production Superintendent and the Technical Services Manager.

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18
Q

What should long-term designs incorporate?

A

Long term designs will incorporate previous geotechnical considerations and recommendations.

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19
Q

What must short-term designs comply with?

A

Short term designs shall comply with the Geotechnical Design Sheets.

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20
Q

Who conducts weekly compliance to design surveys?

A

Weekly compliance to design surveys shall be undertaken by the mine surveyor.

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21
Q

What information may compliance to design include?

A

Compliance to design information may include dimensional control, main access ramps, dump compliance, and water management.

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22
Q

How should non-conformances to design be managed?

A

Any non-conformances to the design shall be assessed and controlled by the relevant responsible role through the weekly planning process.

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23
Q

What does the daily OCE report describe?

A

The daily OCE report will describe the active and non-active work areas, and any relevant geotechnical hazards.

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24
Q

What additional information is included in the two-weekly plan?

A

All information about geotechnical hazards and response actions shall be detailed on the two (2) weekly plan.

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25
What is the minimum requirement for Drop Zones?
As a minimum, a 10 metre Drop Zone shall be established and delineated in all active working pits.
26
What is prohibited within the 10 metre Drop Zone?
All unauthorized personnel shall remain outside of the designated Drop Zone, and no plant or equipment should be parked within it.
27
What is required for personnel entering the 10 metre Drop Zone?
A documented JHA and/or WRAC must be in place for that particular activity.
28
Who is authorized to enter the Drop Zone?
Only personnel who have received additional 'Geotechnical Awareness Training' are authorized.
29
What must be done before entering the Drop Zone?
A visual inspection of the area is required to assess the quality of the highwall.
30
What should the visual inspection consider?
It should consider the structural security of the wall and the risk of wall fretting.
31
What should be ensured regarding visibility in the Drop Zone?
Sufficient visibility of the wall above the working area must be ensured.
32
What is required for equipment breakdowns in the Drop Zone?
A JHA and/or WRAC must be completed prior to repairs or recovery of the machine.
33
What can be done regarding zones at the toe of batters shallower than 45 degrees?
They may be reduced down to 0 meters following consultation with the OCE.
34
What safety measures should be established in the Drop Zone?
Safety barriers such as berms/rills, signs, and flagging tape should be established.
35
Where should mobile equipment without ROPS and FOPS be located?
It should stay outside the Drop Zone.
36
What should be increased in critical areas of the Drop Zone?
The frequency of inspections by the supervisor/OCE should be increased.
37
What role do spotters play in the Drop Zone?
Spotters familiar with the task maintain positive communications with personnel.
38
What should be minimized while working under a Drop Zone?
The time spent under a Drop Zone should be minimized.
39
What equipment should be selected for operations near the wall?
Select equipment that can operate furthest away from the wall.
40
What is the aim of monitoring geotechnical hazards?
To identify physical signs of potential or impending structural or mining deviations.
41
Who is responsible for monitoring slope stability?
It is the daily task of the OCE, but all coal mine workers must inspect and report changes.
42
What does slope stability radar monitoring measure?
It measures movement in large areas of pit walls.
43
What are the two types of radar monitoring?
Critical and non-critical monitoring.
44
What must be done in response to movement alarms?
Movement alarms must be responded to for both critical and non-critical radar monitoring.
45
What do Trigger Action Response Plans (TARPS) provide?
They provide guidance on actions to be taken in response to pre-determined indicators.
46
What do TARPS include?
Step-by-step actions for the treatment of issues in areas of geotechnical instability.
47
What does the Slope Stability TARP outline?
It outlines pre-determined actions required to mitigate the effects of escalating hazards and to re-establish normal mine conditions.
48
Who may increase the TARP classification during a visual inspection?
The OCE/Supervisor may be required to increase the TARP classification.
49
Under what condition can the TARP classification be reduced?
Reducing TARP classification may only be achieved under the strict advice from the geotechnical expert.
50
How often must OCE conduct inspections around the pit?
OCE must conduct their statutory inspections every shift.
51
What is the frequency of inspections for active mining areas?
The Mining Superintendent or Supervisor must inspect all active mining areas once a week.
52
How often should inactive mining areas be inspected?
Inactive mining areas should be inspected every fortnight.
53
What is the OCE's responsibility regarding wall inspections?
The OCE shall undertake a formal inspection of the walls on a daily basis to note if there has been any movement.
54
When should additional slope inspections be made?
Additional slope inspections shall be made prior to re-commencing work after substantial rainstorm events (>50mm) or blasting in the vicinity.
55
Who is responsible for ensuring excavated walls and slopes are constructed to design?
It is the operator's, supervisor's, and production superintendent's responsibility.
56
What must supervisors ensure regarding coal mine workers (CMW)?
Supervisors must ensure that CMW have the relevant authorisations and training to carry out the required work safely.
57
What should be implemented where a geotechnical hazard exists at or behind the crest?
The following hard barrier minimum requirements shall be implemented.
58
What should be installed if the geotechnical hazard is adjacent to a mine road?
Install a bund at least 2m back from the hazard that meets the bunding requirements for roadway/drop-off.
59
What is the required buffer zone distance from the geotechnical hazard?
A buffer zone of 10m shall be delineated with pegs and flagging tape or cones to warn of hazard.
60
What is the purpose of the exclusion zone at the bottom of the slope?
The exclusion zone shall be established at the bottom of the slope, size dependent on the scale of failure.
61
What takes precedence over the drop zone requirement?
The exclusion zone shall override the drop zone requirement.
62
How often should visual inspections of hazards be carried out?
Visual inspections shall be carried out daily, with intervals extended if stability is indicated.
63
Who is responsible for recording monitoring records?
Monitoring records shall be recorded by the OCE in the OCE report.
64
What should be done if excessive movement is observed during monitoring?
Contact the shift Supervisor and take necessary action to ensure the safety of personnel.
65
What methods can be used to monitor slopes where instability is suspected?
Survey control may be utilised, and peg and tape or automatic extensometers may be used to monitor displacement.
66
What may be required to provide recommendations on allowable movement?
A geotechnical expert may be required to provide recommendations regarding the appropriate magnitudes of allowable movement.
67
How are monitoring frequencies determined?
Monitoring frequencies are risk-based and may be varied according to the type of failure or previous experience.
68
What are potential triggers for highwalls/end walls?
Potential triggers include unexpected ravelling of rocks, increased incidence of minor rockfalls, rockfalls from within identified wedge failure configurations, opening of cracks or joints on benches or batter faces, lipping of bedding planes, heave of coal or floor strata, tension cracks on crest in spoil/overburden, offsets or alignments including remnant blast-hole barrel traces, observable or suspected changes in line or level of benches and/or batter faces, and other observations recorded as triggers for previous rock wall failures.
69
What are potential triggers for low walls?
Potential triggers include bulging in slope face, opening of cracks or joints in batter face or on bench, increased incidence of surficial slippage of rock slabs, heave of the coal roof or floor at toe of wall, tension cracks on crest in spoil/overburden, excessive or accelerated movement from monitoring, and observable or suspected changes in line or level of benches and/or batter faces.
70
What are potential triggers for dumps/dumping into water?
Potential triggers include bulging in lower part of slope batter, formation of tension cracks on crest or benches, unexpected rolling of boulders down face, cracking and/or heave of exposed coal or pit floor at toe of dump, sudden commencement of or an increase in seepage, and unstable dump foundation.
71
What actions should be taken when a trigger is identified?
A condition alarm level is to be declared in accordance with the TARP Summary, and the instruction contained therein should be followed. The observer must report the situation to the OCE, who will notify the relevant Supervisor and set the condition alarm level.
72
What should be done with personnel in the area of a potential slope failure?
All persons in the area expected to be affected by slope failure must be withdrawn, and the area is to be cordoned off above and below the wall.
73
Who inspects the area after a trigger is identified?
The area will be inspected by the OCE in conjunction with the Supervisor and/or the SSE as required under the condition alarm level, and the course of further action will be determined.
74
What should be established if cracks are present?
Crack monitoring stations are to be set up if cracks are present, and/or survey points established.

PHMP 003 - Slope Stability (2 decks)

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