三峡三期土石围堰综合防渗技术

Comprehensive Impermeable Technology for Third-Phase Earth & Rock Cofferdam at TCP

三峡工程三期土石围堰防渗工程工期紧、强度高、地质情况复杂,经过工艺实验及科学论证,采用了自凝灰浆、常规高喷、振孔高喷和钻喷一体化等4种防渗技术,成功攻克了高质量快速成墙的围堰防渗难题。围堰如期闭气抽水,为RCC围堰提前施工创造了先决条件,成为运用多种防渗技术进行土石围堰施工的成功案例。

Through workmanship tests and scientific examination, four impermeable techniques, such as self-setting mortar, traditional high-jetting, vibrating hole & high-jetting and integrative drilling & jetting, were employed determinedly in construction of the third-phase earth & rock cofferdam at the Three Gorges project (TGP) featuring tight time schedule, high placement rates and complicated geological conditions. These impermeable techniques, as successful study cases, solved the puzzle in impermeable technology with high quality and rapid construction. The cofferdam was closed and the construction pit was dewatered on schedule, which created preconditions for construction in advance of the RCC cofferdam.