Optimization of excavation supporting structure considering lateralreinforcement effect of CFG composite foundation on soils
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摘要: CFG复合地基竖向加固作用已得到深入研究和广泛运用，但在国内外相关领域未见CFG复合地基的侧向变形和侧压力研究成果。现行国家和行业相关规范、规程缺乏对开挖条件下CFG复合地基侧向基坑支护结构设计的规定和指导。笔者从CFG复合地基竖向工作机理出发，判断CFG复合地基侧向加固作用不可小视，凭借数值模拟规律和跟踪勘察数据，结合基坑监测反馈，对济南省会文化艺术中心（大剧院）舞台台仓锚拉双排桩支护结构进行了优化，从三排锚索减少到一排。尽管如此，施工变形监测结果只是相关计算的1/3，这说明：CFG复合地基侧向加固作用可以有效降低支护结构变形，应值得行业关注和研究。Abstract: The vertical reinforcement effect of CFG composite foundation has been thoroughly studied and widely used. The results of lateral deformation and lateral pressure of CFG composite foundation are scarce in the domestic or foreign relevant areas. The existing national and industrial norms are short of the regulation and guidance of excavation supporting structure design for CFG composite foundation under excavation conditions. The authors think that the lateral reinforcement effect of CFG composite foundation can not be ignored according to its vertical working mechanism. Based on the rules from numerical simulation and tracking survey data, combined with the monitoring feedback to excavations, the supporting structure of combining the double-row piles with the anchor cables for stage-bin of Jinan Provincial Capital Cultural Arts Center (Theatre) is optimized, which makes three rows of anchor cables to a row. Nevertheless, the construction monitoring results of the lateral deformation is only one-third of the relevant calculation, indicating that the lateral reinforcement effect of CFG composite foundation can reduces the deformation of supporting structure effectively, and it is worth of the industrial attention and study.
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