Working in compressed air is a well recognised technique for tunnelling in soft, wet ground. This paper describes techniques for working in pressures of up to 15 bar, significantly above normal statutory limits. For health and safety reasons, working at such pressures requires the use of mixed-gas breathing mixtures and saturation exposure techniques. It requires a much greater knowledge of hyperbaric physiology than traditional compressed air work because of the toxic effects of oxygen and the narcotic effect of nitrogen at such pressures. The risks and mitigation measures for high-pressure work are explained.

中文翻译：

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地下施工：在高压压缩空气中工作

在压缩空气中工作是在湿软地面上掘进隧道的公认技术。本文介绍了在最高15 bar的压力下工作的技术，该压力明显高于正常的法定限值。出于健康和安全原因，在这样的压力下工作需要使用混合气体呼吸混合物和饱和暴露技术。由于在这种压力下氧气的毒性作用和氮气的麻醉作用，因此与传统的压缩空气工作相比，它需要对高压生理有更多的了解。解释了高压作业的风险和缓解措施。