In case of underground construction in area of high ground water level, there is often anti-floating problem during the work.

在高地下水位地区进行地下工程施工，往往存在工程的抗浮问题。

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Construction of various urban underground engineering, deep-buried tube work, large span highway (railway) tunnel are greatly improving tunnel construction technology.

一系列的城市地下工程、深埋管道工程、大跨度公(铁)路隧道的修建，大大促进了隧道施工技术的进步。

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Drilling is an underground construction which has high investment and high risk. Every component of drilling work may lead to different kinds and different levels accidents.

石油钻井是一项高投入、高风险的隐蔽性地下工程，每一作业环节出于自然或人为原因均有可能导致不同程度、形式各异的事故灾难。

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Drilling is an underground construction which has high investment and high risk. Every component of drilling work may lead to different kinds and different levels accidents.

石油钻井是一项高投入、高风险的隐蔽性地下工程，每一作业环节出于自然或人为原因均有可能导致不同程度、形式各异的事故灾难。

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