Pillar-and-breast meaning

Pillar-and-breast definitions

The pillar-and-breast mining method is a technique commonly used in underground coal mining. It involves the extraction of coal in a series of chambers separated by coal pillars that support the roof of the mine.

Methodology

In pillar-and-breast mining, miners first extract coal from the rooms or chambers created by removing the coal between the pillars. As they advance in the extraction process, they leave behind coal pillars to support the roof of the mine.

Pillars

The pillars left in place are crucial for the stability of the mine. They prevent the roof from collapsing and ensure the safety of the miners working underground. The size and spacing of the pillars are carefully calculated to provide the necessary support.

Breasts

The breasts, on the other hand, refer to the areas where coal is extracted. Miners remove the coal from these sections, leaving behind the pillars. The breasts are typically smaller in size compared to the pillars and need to be strategically planned to maintain the structural integrity of the mine.

Benefits

One of the main advantages of the pillar-and-breast mining method is its efficiency in extracting coal. By leaving behind pillars of coal, miners can safely extract coal from the breasts without the risk of roof collapses. This method also allows for a continuous operation with minimal disruptions.

Challenges

However, pillar-and-breast mining poses challenges, particularly in terms of pillar design and stability. If the pillars are not adequately sized or spaced, there is a risk of roof collapses and other safety hazards. Miners must carefully plan and execute the extraction process to ensure the structural integrity of the mine.

In conclusion, the pillar-and-breast mining method is a widely used technique in underground coal mining. It offers efficiency in coal extraction while prioritizing the safety of miners. By understanding the importance of pillars and breasts in this method, mining operations can be conducted effectively and safely.

Pillar-and-breast Examples

1. The ancient ruins had a pillar-and-breast structure.
2. The architect designed the building with a unique pillar-and-breast feature.
3. The historical site showcased intricate pillar-and-breast carvings.
4. The temple's entrance was adorned with pillar-and-breast statues.
5. The museum displayed artifacts with pillar-and-breast patterns.
6. The cemetery had tombstones with pillar-and-breast engravings.
7. The cathedral's interior had a grand pillar-and-breast design.
8. The castle's gates were decorated with pillar-and-breast motifs.
9. The mansion featured a majestic pillar-and-breast staircase.
10. The garden was decorated with pillar-and-breast sculptures.

Most accessed