Metallurgical mine collapse accident stope often happens.
Preventive measures
When the multi-layer ore body is layered and recovered, the lower layer of the ore layer must be recovered after the rock at the top of the upper layer collapses and stabilizes.
2 When the upper and lower adjacent middle sections are simultaneously harvested, the inclined length of the upper middle section mining working surface ahead of the lower middle section should be more than 20m.
3 When the mining work finds that the top is soft and unstable, it must take support measures. If the blasting or ground pressure is damaged, the support should be repaired in time to confirm the safety and correct operation.
4 Before the mining, the top plate and the two sets of pumice must be treated first, and the safety must be checked. In the operation, it is found that the warning is to be taken off, and the operation should be stopped, especially if there is a danger of a big roof, the operator should be notified immediately to leave the site.
5 If there is a goaf at the edge of the stope, the edge of the goaf shall be taken first. In case of a stope with broken roof and severe ground pressure, in addition to necessary support, the mining progress shall be accelerated and the stope shall be shortened as much as possible. Exposure time.
2. Floor collapse
Under normal circumstances, the collapse of the floor of the stope is rare, but in recent years, there have been frequent mining and mining sites around the state-owned mines, which have become the "upstairs and downstairs" operation, disrupting In the normal production order, it is inevitable that there will be a collapse of the floor of the stope. This poses a serious threat to the safety of the workers in the stope.
Preventive measures
1 The designated functional department constantly monitors the surrounding civilian mining sites. Timely understanding of the dynamics of the mining sites, the competent department in charge of monitoring will analyze the impact of the mining and mining sites on the safety production of the mines on a monthly or quarterly basis, and take preventive measures in time for the hidden dangers raised in the report.
2 The underground production unit finds that there is a movement of civil mining sites, and it is necessary to promptly report and write a written report to the relevant mine leaders and competent authorities. In order to threaten the dangerous situation of the underground mining site, personnel should be evacuated immediately to prevent major accidents. .
3 For the mining sites that are often exploited at different levels, the mining functional department must take mandatory measures to stop production.
3. Blasting and wounding people
The blasting operation in the stope is an important process in production and an important part of safety management. In this work, the Blasting Safety Regulations must be strictly observed, and blasting accidents are highly prone to violations.
Preventive measures
1 Strictly observe the Blasting Safety Regulations. All personnel engaged in blasting work must undergo special training, pass the examination, and hold the blasting operation certificate issued by the local public security department before they can engage in blasting operations.
2 When the fuse is detonated, it is ignited by one ignition method. If single ignition is required, the number of consecutive shots of one person shall not exceed 5 (group). The length of the fuse should not be shorter than 1.2m.
3 Single operation is strictly prohibited in blasting operations. Before the gun is fired, the adjacent approach and stop personnel must be notified to evacuate to a safe place. When the gunners leave the gun, they must constantly make a secure call.
4 When the second blasting is carried out, every entrance to the blasting site must be sent to stand, and the guns are not allowed to be dismissed.
5 After each blast, from the last shot, it must be 15 minutes before sending a person to enter the work surface to check, after confirming that there is no abnormal situation, the squad leader approves before allowing the personnel to enter the work surface.
4. Gun smoke poisoning
After the blasting of the stope, a large amount of gun smoke is contained in the toxic and harmful gas. If the local ventilation system of the underground stop is not perfect, the gun smoke cannot be discharged in a short time. When the guns are not discharged, the operators are eager to operate and are prone to gun poisoning.
Preventive measures
1 The stope must be perfected for the local ventilation system. For the poorly-ventilated stope, fans should be installed for ventilation.
2 Always maintain the ventilation equipment of the stope. When the ventilation equipment fails, it should be repaired in time to ensure the normal operation of the equipment.
3 After each blasting, firstly, the ventilation equipment should be started for ventilation, and the production can be organized after the smoke is removed.
5. The slipper falls
The chute in the stope is an important facility for the handling of ore. Improper protective measures are prone to slipping accidents.
Preventive measures
1 Safety protection measures such as lighting, grid screen, manhole cover or railing must be perfect and reliable, and should be inspected frequently. In case of damage, the damage prevention device should be repaired in time.
2 Safety warning signs, safety hooks, safety belts, and safety of workers should be provided at the turn-overs.
3 Cover the manhole cover in time for the chute that is not used temporarily to prevent personnel from falling in.
6, the explosion of rolling stones injured people
After the deep hole blasting in the stope, a pile is formed. During the ore handling process, the angle of the pile is gradually increased. If the angle of the pile is too large and not treated in time, once the large ore is rolled off from the upper part of the pile, the miners can't dodge. It is prone to accidents involving rolling stones.
Preventive measures
1 Determine the angle of the explosion. According to the production practice experience, the explosion angle is safer at around 40 degrees, but the maximum is not more than 45 degrees.
2 In the mining operation, it is found that the explosion angle is too large to be treated in time, and the mine can continue to be mined when it is confirmed that the explosion has reached a safe angle.
3 Strengthening the safety inspection of the stope, the management personnel at all levels found that the explosion was too steep and risky production, and immediately ordered it to stop mining and deal with the explosion.
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