Abstract
The large and medium-sized hydropower projects underground cavern group are basically in relatively integrate surrounding rock, so there are few engineering examples in layered surrounding rock with type III surrounding rocks as the main rock, and lack of successful experience. According to rock-bolted crane girder under the layered surrounding rock of a large underground power station, analyzing prototype dynamic monitoring data of the excavation, unloading and load-bearing test .The distribution of the monitoring data conforms to the normal law, and there are no large outliers, under the action of a large number of bolts, rock-bolted crane girder basically forms a good integrity with the layered surrounding rock, and the load-bearing test has no effect on the stress condition and stability condition of surrounding rock.
Highlights
Rock-bolted crane girder is one of the load-bearing structures of lifting equipment used in mechanical and electrical installation of underground powerhouse
It uses anchors to anchor cast-in-situ concrete crane beams to the rock mass, and the load contacts the rock through the anchor rod and concrete beam The interaction on the surface is transmitted to the rock mass, making full use of the bearing capacity of the surrounding rock
Rock-bolted crane girder is one of the load-bearing structures of lifting equipment used in mechanical and electrical installation of underground powerhouse, the load is transmitted to the rock mass through the interaction between the anchor and the concrete beam, making full use of the bearing capacity of the surrounding rock
Summary
Rock-bolted crane girder is one of the load-bearing structures of lifting equipment used in mechanical and electrical installation of underground powerhouse. Rock-bolted crane girder is one of the load-bearing structures of lifting equipment used in mechanical and electrical installation of underground powerhouse, the load is transmitted to the rock mass through the interaction between the anchor and the concrete beam, making full use of the bearing capacity of the surrounding rock. Rock-bolted crane girder of underground powerhouse with layered surrounding rock is analyzed by dynamic monitoring method, and the state of rock-bolted crane girder under layered surrounding rock is made clear in the unloading and bearing operation of cavern, so as to ensure engineering safety. This paper provides the important data reference for the same type of project
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