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我国在第四系、第三系松散含水层和地表水体下采煤试验研究,已经积累了较多的技术经验和科学数据。其中某些方面还处于国际同类技术的先进行列。但是,直到目前,旨在缩小防水煤柱的开采工作仅在松散层底部为弱含水层或为稳定粘性土隔水层的少数矿井中进行。大多数水体下采煤矿井留设的安全煤(岩)柱高度(垂高)仍普遍偏大。小则40～50米,大则80～100米以上。防水煤柱压煤甚多。
China’s Quaternary and Tertiary loose aquifers and surface water mining under the experimental study, has accumulated more technical experience and scientific data. Some of these aspects are still in the advanced stage of international similar technologies. Until now, however, mining efforts aimed at shrinking waterproof pillars were only carried out in a few mines where the bottom of the loose layer was a weak aquifer or a stable clay soil aquitard. The height (vertical height) of the safety coal (rock) column left in most coal mining wells is still generally large. Small 40 to 50 meters, as large as 80 to 100 meters. Water pressure coal briquette many.