向家坝水电站混凝土导墙爆破拆除技术

Discussion on blasting removal technology of concrete guide wall in Xiangjiaba Hydropower Station

为给向家坝水电站左岸电站副厂房施工创造良好条件,需快速拆除二期纵向导墙厂房段。结合向家坝工程现场实际,在分析爆区周边构筑物特点及爆破安全振速的基础上,提出了详细的爆破设计方案,具体涉及爆孔设置、爆破参数选取、装药与堵塞,网络联接等。爆后检查表明,实际爆破效果良好,爆破振动控制指标达到设计要求。其爆破设计与施工技术方案可供其他工程借鉴。

In order to create favorable condition for construction of auxiliary powerhouse at the left bank of Xiangjiaba Hydro -power Station , the powerhouse section of the second stage longitudinal guide wall should be quickly removed .In combination with the practical condition of Xiangjiaba Hydropower Station , a detailed blasting design was proposed on the basis of analyzing the structure characteristics near the blasting region and the blasting safety vibration velocity , including arrangement of blasting holes, blasting parameters selection , explosive charge and jam , network connection , etc..The check after blasting shows that the blasting design obtains good effect and the blasting vibration control index meet the design demand.