砂卵石地层深孔帷幕注浆止水施工技术

摘要

结合北京地铁14号线丰台北路站工程现场卵石粒径大、强度高、成孔困难的地质条件，对基坑降水的难题进行了研究，提出了注浆止水帷幕的处理方式，并阐述了注浆止水的施工工艺及技术要点，达到了预期的止水效果。%Combining with the geological conditions at the Fengtai North Road engineering site along No. 14 Beijing Subway including large cobble diameter, high strength, and difficulties in holing, the paper researches the puzzles in the foundation pit dewatering, points out the treatment for the grouting waterproof curtain, and illustrates its construction craft and technical points, so as to achieve the expected waterproof effect.