The safe and efficient drilling of overburden (fills and natural soils) and rock is integral to many specialty geotechnical construction techniques. The state of practice for overburden drilling techniques was most recently described by Bruce in 2012, and the history of down-the-hole (DTH) drilling for rock was provided by the authors in 2013 (Bruce et al., 2013). Thereafter, development and innovation have continued, principally to satisfy specialty contractors' goals for systems providing faster production, lower costs, more consistent and reliable performances, and easier operation and maintenance. This paper describes more recent development in overburden drilling, and also reviews innovations in DTH methods operated by air, and by water.
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机译：安全有效地覆盖层（填充物和天然土壤）和岩石的钻探是许多特殊岩土施工技术不可或缺的一部分。 Bruce于2012年描述了覆盖岩层钻探技术的实践状态，并于2013年由作者提供了岩石的潜孔（DTH）钻探历史（Bruce et al。，2013）。此后，开发和创新一直在继续，主要是为了满足专业承包商的目标，即提供更快的生产，更低的成本，更一致，更可靠的性能以及更简便的操作和维护的系统。本文介绍了覆盖层钻探的最新进展，并回顾了通过空气和水进行的潜孔钻探方法的创新。
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