振动水冲法加密技术在三峡工程二期围堰中的应用

Application of vibro-hydraulic consolidation tech^nology to second-stage cofferdam construction in Three Gorges Project

为确保三峡工程二期围堰深槽防渗墙施工槽孔稳定 ,水下抛填的低密度风化砂应达到一定密实度 .采用振动水冲法加密技术对三峡工程二期围堰深水抛填风化砂进行加密 ,最大振冲深度达30m ,使振冲后风化砂达到中密至密实状态 ,风化砂干密度大于 1.80t/m3,确保了防渗墙施工造孔顺利进行 .工程实践表明 。

In the construction of the second stage cofferdam, a certain compactness of the low density weathered sand dumped into water should be reached to ensure the stability of channel slots in the construction of the deep channel impervious wall. The vibro hydraulic consolidation technology was adopted to consolidate the damped weathered sand, and the maximum depth of consolidation reached 30?m . By the technology, the weathered sand could reach middle to dense density, and the dry density of the weathered sand was larger than 1 80?t/m 3 , ensuring the formation of holes in the construction of the impervious wall. Practice shows that the vibro hydraulic consolidation technology is feasible in construction of deep water cofferdams.