Sentence examples for mining depth increases from inspiring English sources

As the mining depth increases, all coal seams become outburst-prone and there is no suitable seam to be mined first.

Because the mining depth increases continuously, the proportion of roadways reinforced only by rock bolting (Fig. 1a) decreases year by year, that of roadways supported by combinations with yieldable steel arches and rock bolting (Fig. 1c) increases rapidly.

Most of the above-mentioned studies were undertaken in normal mining depth, as mining depth increases ground stress becomes quite high and the pore forming rate and effective drainage time are relatively low (Palchik 2005; Li 2012; Szlazak et al. 2014).

However, as the mining depth increasing, parts of the gas drainage system are not suitable for mines with high gas emissions.

With coal mining depth increasing, coal output growing, and mining areas expanding, the geological and mining conditions have changed considerably, which manifest the following three characteristics (Kang and Wang 2007).

In recent years, with mining depth increasing and the implementation of more complex and fully-mechanized caving mining processes, the methane emission problem in goafs has become increasingly serious because of the substantial fracturing of rock strata that develops around stopes.

With coal production and mining depth increasing, gas leak prevention and control in gassy coal seams with low permeability and high occurrence of outbursts have become extremely important and high-cost issues (He et al. 2005; Zhou et al. 2005; Yuan 2008).

As mining depths increase, anchor and bolts with larger extension and higher loading capacity are needed.

As mining depths increase, new challenges, such as gas drainage, gas outbursts and rock bursts induced by mining extraction, have emerged, particularly in gassy, multiple-seam coal mines.

However, as mining depths increase, some elements of this gas control system become unsuitable for seams with high gas emissions.

At present, there are 47 coal mines in China with mining depth reaching 1,000 m, of which, the Suncun coal mine of the Xinwen coal mining district in Shandong Province, is the deepest one with a depth of 1,500 m.