三峡二期下游围堰混凝土防渗墙拆除爆破试验研究

Experimental research of blasting demolition of concrete cut-off wall in second-stage downstream cofferdam of Three Gorges Project

由于三峡二期下游围堰混凝土防渗墙部分墙段内有灌浆施工时预埋的钢管及固定钢管的保持架,这种结构在以往的围堰防渗墙爆破拆除工程中没有先例。为此着重介绍了钢管爆破试验、爆破网络模拟试验及混凝土防渗墙现场爆破试验的试验方法及试验成果,并通过三峡二期下游围堰爆破拆除工程实践,证明了防渗墙爆破拆除设计方案达到了安全可靠经济合理的要求。

Under the condition of limited demolition duration, with a great quantity of excavation under water, especially the fact that there were grouting steel tubes and holding frames within the concrete cut-off wall and the demolition of this kind of structure has never been faced before, the demolition work of the second-stage downstream cofferdam in the Three Gorges Project was of great difficulty. The blasting experiments of steel tube, the simulation of blasting initiation network, and the demolition of the cut-off wall are introduced in the paper.