- Expansion
- Shrinkage
- Contraction
- Rise
a. Expansion
Expansion; Removal of overburden involve fragmentation due to blasting. The fragmented rocks are also vulnerable to more weathering. The previously loaded rocks get relaxed with the release of the forces leading to volume expansion. Creation of new surface area is associated with expansion of volume.
- Single riveted butt joint
- Single riveted lap joint
- Double riveted butt joint
- Double riveted lap joint
Single riveted lap joint; the efficiency of different types of joints are provided below
|
Joint |
|
Efficiency (%) |
|
Lap |
Single riveted |
50-60 |
|
Double riveted |
60-72 |
|
|
Triple riveted |
72-80 |
|
|
Butt |
Single riveted |
55-60 |
|
Double riveted |
76-84 |
|
|
Triple riveted |
80-88 |
- owner, agent or manager of the mine or
- by any person to whom power in this behalf has been delegated by the owner by a power of attorney.
- Only A
- Only B
- Both A & B
Both A & B
- CIM
- RIM / Inspector of mines
- Owner of the mines
- Sec. 12 Committee
- Safety committee
Owner of the mines
- CIM only
- RIM only
- DM only
- To all the above
- Both A & B
To all the above
- 7, CIM, RIM
- 15, CIM, DM
- 7, CIM, DM
- 60, CIM, RIM
- 30, CIM, RIM
7, CIM, RIM
- Consider the proposal for making rules & regulations
- Enquire into accidents referred to it by the central govt.
- Enquire into the accidents referred to it by the Chief Inspector
- To hear & decides such appeals/objections against notices/order under the Act
- Enquire into such other matters referred to it by the central govt
Enquire into the accidents referred to it by the Chief Inspector
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