Study on pilot channel formation on the lower Yellow River by the millisecond-delay blasting technique
WU Bao-sheng · Journal of Hydroelectric Engineering · 2006
Study is presented on how to form a pilot channel for great water supply with the millisecond-delay blasting technique in front of the lock along the wide bed of the lower Yellow River.The method presented in this paper is to excavate a smallest channel in the wet beaches by using the millisecond-delay blasting technique and then transfer water from the to make it large enough to form a final pilot channel in front of the lock.The experimental results show that the millisecond-delay blasting technique can be easily implemented in field constructions and effective in excavating a pilot channel in the wet bank.The explosion liquefies the soil and one-way horizontal distance of the liquefaction is about ten times the size of the explosion depth.The channel formed by explosion can keep for about 20 minutes,and then the channel is filled with water and silt from the bottom and two sides,a mud river is formed.The pilot channel so formed is more propitious for its wash than that in normal condition.The method is crucial to the increase of the probability of water supply in industry and agriculture.