The Zhao'aotang Tunnel in Section 3 of Yunnan Qiuyan Expressway is mainly composed of limestone,characterized by moderate weathering,microcrystalline structure,thick layers,and large block structures;The rock quality is good,the karst landscape is prominent,and the surrounding rock grade is Ⅲ-IV.In order to ensure construction safety and maintain the stability of the bedrock,the energy gathering water pressure smooth blasting technology has been selected.By utilizing the incompressible characteristics of water,the blasting energy is transferred without damage,and the"water wedge"effect formed by the surrounding rock blasting further breaks the surrounding rock,which can also prevent rock blasting.This technology successfully solves the problems of surrounding rock disturbance,over excavation,frequent supplementary blasting,high dust concentration after blasting,and poor air quality inside the tunnel during excavation,providing important reference for tunnel excavation in complex environments in the future.
joint fissureskarst developmentsurrounding rockenergy gathering water pressure smooth blastingtunnel
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