Research on the Key Technology of the Prefabricated Toughness Support Structure of the Deep and Large Shaft
In view of the problem of ventilation shaft construction in deep,long and large mountain tunnels,the theory and key technology of prefabricated steel corrugated plate support structure of deep and large shaft are put forward,and the dynamic design and construction technical measures of prefabricated support system under complex geological conditions such as surrounding rock type change,joint fissure development and abundant groundwater are studied.Systematic construction process is formed by summarizing and analyzing key technologies such as rock excavation,steel corrugated installation and splicing,bag beam setting,anchor bolt installation,and polymer grouting based on numerical simulation;new polymer materials with environmental protection,early strength,chemical corrosion resistance,impermeability and compression resistance are applied for backfill grouting,revealing the filling buffer energy absorption principle and reverse preloading mechanism behind the polymer.In addition,combined with the automatic monitoring and measuring system,surrounding rock deformation control measures are proposed to provide technical guarantee for the safe,economical and rapid construction of an increasing number of deep and large shafts.
deep and large shaftassemblytoughness support structuresteel corrugated plategrouting
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