Key points for quality inspection and acceptance of earthwork in mining area

        (1) Key points for quality inspection and acceptance of excavation work
        1. The quality inspection of the excavation work includes the dimensional deviation of the elevation and length and width, and the slope tolerance in accordance with the permissible deviation requirements of the regulations, while ensuring that the flatness and the base soil properties are in accordance with the design requirements.
        2. The slope value of the temporary excavation shall comply with the regulations; for the excavation depth, the soft soil shall not exceed 4m and the hard soil shall not exceed 8m.
        (2) Filling work quality requirements
        1. The filling work requires the elevation deviation to meet the requirements of the regulations, and the sub-lamination coefficient meets the design requirements; the other includes the backfill soil, the layer thickness and the water content to meet the design requirements, and the surface leveling meets the deviation limit requirements.
        2. Filling earth materials should be used after acceptance according to design requirements; drainage measures should be checked during filling.

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