俞良晨, 郭书兰, 车灿辉, 阎长虹, 李呈亮, 侯壮壮. 2019: 淤泥质软土中某深大基坑开挖顺序优化分析. 工程地质学报, 27(s1): 17-22. DOI: 10.13544/j.cnki.jeg.2019137
    引用本文: 俞良晨, 郭书兰, 车灿辉, 阎长虹, 李呈亮, 侯壮壮. 2019: 淤泥质软土中某深大基坑开挖顺序优化分析. 工程地质学报, 27(s1): 17-22. DOI: 10.13544/j.cnki.jeg.2019137
    YU Liangchen, GUO Shulan, CHE Canhui, YAN Changhong, LI Chengliang, HOU Zhuangzhuang. 2019: OPTIMIZATION ANALYSIS OF EXCAVATION SEQUENCE OF A DEEP FOUNDATION PIT IN MUDDY SOFT SOIL. JOURNAL OF ENGINEERING GEOLOGY, 27(s1): 17-22. DOI: 10.13544/j.cnki.jeg.2019137
    Citation: YU Liangchen, GUO Shulan, CHE Canhui, YAN Changhong, LI Chengliang, HOU Zhuangzhuang. 2019: OPTIMIZATION ANALYSIS OF EXCAVATION SEQUENCE OF A DEEP FOUNDATION PIT IN MUDDY SOFT SOIL. JOURNAL OF ENGINEERING GEOLOGY, 27(s1): 17-22. DOI: 10.13544/j.cnki.jeg.2019137

    淤泥质软土中某深大基坑开挖顺序优化分析

    OPTIMIZATION ANALYSIS OF EXCAVATION SEQUENCE OF A DEEP FOUNDATION PIT IN MUDDY SOFT SOIL

    • 摘要: 南京某深大基坑位于长江下游岸边,场地地层为典型的二元结构且淤泥质软土广泛分布,承压水位高,基坑场地地质条件十分复杂。基坑邻近一个高层建筑,开挖范围涉及到厚层淤泥质土,且支护结构全部埋设于淤泥质软土中,基坑的开挖顺序直接关系到基坑工程及周围建筑物的安全。基于该基坑最深的部位,这里将基坑的开挖顺序分为:I、先开挖主隧道再开挖匝道;Ⅱ、先开挖匝道再开挖主隧道;Ⅲ、主隧道和匝道同时开挖3种开挖方式,运用FLAC3D模拟软件对3种工况下基坑支护结构及周围建筑物的变形进行对比分析,得知先开挖主隧道再开挖匝道或先开挖匝道后开挖主隧道对基坑支护结构和周围建筑物的影响最小,应优先选择这两种开挖方式,尽量避免主隧道和匝道同时开挖的开挖方式。该研究可为类似深厚淤泥质土中深大基坑的开挖与设计提供经验。

       

      Abstract: A deep foundation pit in Nanjing is located on the lower bank of the Yangtze River. The site is a typical binary structure with widely distributed muddy silty soil, high pressure water level, and complex geological conditions of the foundation pit. The foundation pit is adjacent to a high-rise building. The excavation scope involves thick muddy silty soil, and the supporting structure is all buried in the muddy silty soil. The excavation sequence of the foundation pit is directly related to the safety of the foundation pit and surrounding buildings. Based on the condition of the deepest part of the foundation pit, the excavation sequence of the foundation pit is divided into 3 methods:I first excavation of the main tunnel and then excavation of the ramp; Ⅱ first excavation of the ramps and then excavation of the main tunnel; Ⅲ parallel excavation of the main tunnel and the ramp, using FLAC3D simulation software to analyse the deformation of the supporting of foundation pit and surrounding buildings under three excavation methods. And know that when first excavation of the main tunnel and then excavation of the ramp or first excavation of the ramps and then excavation of the main tunnel, the deformation and impacts on surrounding buildings and the supporting of foundation pit is minimal. This study provides experience for the excavation and design of deep and large foundation pits in deep muddy silty soil.

       

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