【Excerpts】Safety level of foundation pit engineering

        The safety grade of foundation pit engineering is divided into three safety levels according to the adaptability of the supporting structure and the surrounding environment and the possible harm caused by the foundation pit engineering to the surrounding environment. Namely, for the primary, secondary and tertiary deep foundation pit projects, the corresponding importance coefficient is 1.1,1.0 and 0.9 respectively.

Grade 1

★ The surrounding environmental conditions are very complex

★ The consequences of the damage are very serious

★ Foundation pit depth is greater than 12m

★ Engineering geological conditions are complex

★ Groundwater level is high, complex conditions and serious impact on construction

Grade 2

★ The surrounding environment conditions are more complex

★ The resulting consequences of the destruction are serious

★ The depth of the foundation pit is less than or equal to 12m and greater than 6m

★ Engineering geological conditions are more complex

★ The groundwater level is relatively high, the conditions are more complex, and the construction impact is more serious

Grade 3

★ The surrounding environment conditions are simple

★ The consequences of the damage are not serious

★ Foundation pit depth is less than or equal to 6m

★ Engineering geological conditions are simple

★ Low groundwater level, simple conditions, slight impact on construction different scope of foundation pit supporting technology

 ——Source: A Miscellany of Research

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