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南水北调中线工程河南段已经进入关键时期,沿线各渠段的开挖已基本成型,但在部分渠段出现了具有不同程度湿陷性的膨胀岩(土),对边坡稳定性及衬砌完成的混凝土面板完整性有较大影响,必须重新开挖换填才能保证施工质量。现对膨胀岩(土)的开挖回填技术进行简述,以备参考。
The Henan section of the mid-route of the South-to-North Water Diversion Project has entered a crucial period. The excavation of all the sections along the line has basically taken shape. However, some sections of collapsible rocks (earth) with collapsible collapses appear in some sections of the canal, The integrity of concrete panels have a greater impact, we must re-excavation for filling to ensure the construction quality. Now expansive rock (earth) excavation and backfill technology for a brief reference.