1 the construction support shall be constructed in time with the excavation to ensure the construction safety.
2 when choosing the support method, the anchor rod, shotcrete or the combination of anchor and shotcrete should be given priority as temporary support. When bolting and shotcreting support is used in weak surrounding rock, it should be considered comprehensively according to geological conditions and auxiliary construction methods.
3 for different types of surrounding rocks, different structural types of construction support should be adopted.
(1) class ⅵ surrounding rock may not be supported, while class ⅵ surrounding rock should be supported by local shotcrete or local anchor. In order to prevent rockburst and local falling rocks, steel mesh can be partially bolted.
(2) the surrounding rocks of class ⅳ ~ ⅲ can be supported by anchor rod, anchor rod hanging net, shotcrete or combined anchor and shotcrete. ⅲ class surrounding rock can be added with steel frame when necessary.
(3) The combined support form of bolting, shotcreting and wire mesh should be adopted for Class Ⅱ ~ Ⅰ surrounding rocks, and the auxiliary construction method can be combined for construction support.
(4) when the geological conditions are poor and the surrounding rock is unstable, members can be used for support.
4 records shall be made when anchor rod, shotcrete and component support are used.
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