Safety Control Technology of Large-Scale Basting Excavation in the Mountain Near the Railway
The construction environment for carrying out large-scale mountain blasting excavation near the existing Railway is complex,and the safety standards of the existing structures are high.By controlling the total scale of blasting,the dosage of a single hole,the amount of a single initiating charge and increasing the protective measures of flying rocks,the blasting vibration speed is controlled below the critical value of 3 cm/s,the maximum flying distance of flying stones is controlled within the critical value of 200 m.After further optimizing the construction plan,the safety value of the existing line blastingvi bration is set to 2 cm/s,the safety value of the meximun flying distance of flying stones is set to be 20 m.The results of the project indicate that the blasting vibration velocity of each detection point is less than 2 cm/s,the maximum flying distance of flying rocks is less than 20 m,and the vibration generated by blasting and flying stones will not affect the safety of the existing railway.The blasting control scheme demonstrated in this paper can effectively control the harmful effects of blasting and ensure the safety of blasting excavation construction near the existing railway.
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