南水北调中线穿黄隧洞工程盾构施工关键技术

Key Shield Construction Technologies in Middle Route Yellow River-Crossing Project of South-to-North Water Transfer Project

南水北调中线穿黄隧洞工程盾构施工具有地质条件复杂、大埋深、高外水压力、长线路、大直径等施工特点及其相应的技术难题。经过在施工实践中的创新与实践,在泥浆配置技术、掘削面稳定控制技术、突破规范的壁后注浆技术、高外水压力条件下的盾构施工防渗技术、端头地层加固技术、大埋深/高外水压力下的带压进舱技术、盾构掘进姿态控制技术、精密的长距离竖井联系测量技术、长距离泥水输送技术、大坡度盾构掘进技术等方面取得了突破与进展,确保了工程的顺利实施。穿黄盾构工程的各项技术指标均达到了理想的效果,相关工程施工技术可供类似工程参考和借鉴。

There are many difficult technical problems in the construction of the Yellow River-Crossing Shield Project in the middle route project of the South-to-North Water Transfer Project, due to complicated geological conditions, large buried depth, high groundwater pressure, long tunnel line and large tunnel diameter. In the construction practice, some technologies are developed, to ensure the successful project construction. They include mud configuration technology, excavation surface stabilizing technology, wall-back grouting technology （beyond the current standard practice）, shield construction seepage control technology under high groundwater pressure, shield access section ground consolidation technology, hyperbaric operation technology under large buried depth and high groundwater pressure, shield construction attitude control technology, precise long distance shaft connection survey technology, long distance mud transportation technology, high gradient driving technology. Various technical indexes in the Yellow river-crossing shield project are satisfactory, and these technologies would provide some guidance for similar projects in the future.