Control technology of underwater reef blasting in channel dredging
Underwater reef blasting is widely used in channel expansion and dredging engineering,but the blasting construction is affected by tidal current and wave,and the environment is complicated and difficult.The construction of the reef blasting project is located in the navigable area.In order not to affect the normal operation of the ship,the electronic detonator is used to detonate one hole by one hole,and the gun holes with Φ115 mm aperture andΦ146 mm aperture are selected.The blasting parameters of explosive consumption per unit is 1.6 kg/m3,hole row spacing is 2.5 m×2 m and 3 m ×2.5 m respectively,and ultra-deep is 1.5 m.The effects of blasting on wharves,dykes,ships and fish are analyzed from the angles of blasting vibration,water shock wave and flying rocks to ensure the safety of blasting and minimize the effects.The results show that the underwater reef blasting has good effect,uniform block,and no harm to the protection objects,fish and ships in the channel,which has an important guiding role for the subsequent similar blasting.
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