采用爆破法压实松散的无凝聚性土体已有40余年历史,以美国起步较早,苏联、孟加拉国、荷兰和巴西等同亦有应用。过去一些工程中爆破的最大处理深度仅为17米左右。尼日利亚杰巴坝,因其坝基较深,故在爆破处理前,先采用水力冲填法在河床上铺以5米厚的砂垫层,以提供一个干燥的施工平台。这样一来,爆破的最大处理深度增大到45米,为以前常见的爆破深度的2.5倍。该工程采用深层爆破法共处理砂基23.5万米~3,单价为9.53美元/米~3(其中包括较高的试验费用在内)。如果不仅对爆破孔下部加载,而且对自底部至顶部的整个孔内 Blasting has been used to compact loose unconsolidated soils for more than 40 years. The United States started earlier and has applications in the Soviet Union, Bangladesh, the Netherlands and Brazil. Some projects in the past blasting the maximum depth of only about 17 meters. Because of its deep dam foundation, the Djiba Dam in Nigeria used a hydraulic impounding method to spread 5m-thick sand bedding on the riverbed before blasting to provide a dry construction platform. As a result, the blasting maximum processing depth increased to 45 meters, 2.5 times the previous common blasting depth. The project uses a deep blasting method co-processing sand base 235,000 ~ 3, unit price of 9.53 US dollars / m ~ 3 (including higher test costs included). If not only for the lower portion of the blasthole loading, but also for the entire hole from the bottom to the top