厚层淤泥中的爆炸定向滑移法原理及工程实例

Case study on thick silt replacement by blasting directional slippage method

介绍了一种能应用于深厚层淤泥软基的挤淤法——爆炸定向滑移法 (Bosm)。该法是通过在抛石堤头前方淤泥中一定位置处埋置群药包,利用爆炸产生的强冲击波和震动扰动淤泥并降低淤泥强度,使抛石堤下方及周围淤泥的结构破坏,瞬间丧失强度,短期内难以恢复,形成定向滑移条件,抛石堤下沉实现泥石置换。同时,结合深港西部通道海堤挤淤工程,详细介绍了爆炸定向滑移法的施工参数和工序流程,提出了施工质量控制和检测措施。通过钻孔、物探及沉降观测等技术手段对竣工后大堤进行的检查表明, 大堤是稳定的,采用爆炸定向滑移法修筑海堤是成功的。值得在深厚层淤泥的海堤挤淤工程中推广。

Blasting directional slippage method(BDSM) is a new silt replacement method . It can be widely used to build hydraulic projects(for examples: bulwark,dock and so on) in thick silt. The mechanism of BDSM is introduced. The structure of silt around and under bulwark is destroyed by shock and vibration of explosive blasting in silt. And the silt strength would be dropped because of the pore water pressure rising. It is very difficult to resume the silts strength in a short time. All these are conditions of riprap directional slippage,the silt would be replaced by riprap. Taking the engineering in Shenzhen-Hongkong western corridor as an example with BDSM on thick silt,the control standard of implementation quality and quality examination results are put forward. The results show that the method is effective.