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三峡工程二期围堰防渗墙试验目前已基本完成．通过二期围堰右上接头段近6个月的试验证明，液压双轮铣槽机不适应比较坚硬的花岗岩和块球体地层·较坚硬的花岗岩块球体可利用冲击反循环钻机与液压抓斗配合完成．“两钻一抓”生产性试验已经全部结束，并成功地进行防渗墙柔性材料
Three Gorges Project cofferdam cutoff wall test has now been completed. Proximate 6 months through the cofferdam joint section of the last 6 months proved that the hydraulic two-wheel slot milling machine does not meet the more rigid granite and block spheres · Hard granite block sphere can be used with the impact of reverse circulation drilling rig and hydraulic grab with carry out. The “Two Drills and One Grasp” production test has been completed, and successfully impermeable wall flexible material