为了提高井下作业的效果，通过测试毛管渗吸时间来确定抑制黏土膨胀所需的盐浓度。
To improve well-operation performance, capillary suction-time testing was performed to determine salt concentration required to prevent clay swelling.
然而，避难硐室或救生舱就是这样一个在煤矿发生事故时为无法及时撤离的井下作业人员提供一个躲避灾难、赢得救援时间的安全的密闭空间。
However, refuge chamber or rescue capsule is a closed space, it for the underground work who cannot evacuate provide a avoid disaster in time and win the rescue time when coal mine accident.
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