以昆明市某超深基坑工程为例,分析探讨了大环梁内支撑结构在深厚泥炭质土层中应用的可行性及变形、应力变化规律。基坑支护结构位移及应力监测结果表明,环形内支撑结构能克服泥炭质土中锚杆锚固力差、易松弛变形等缺点,具有受力性能合理、方便施工且经济等优点,相对于与同类淤泥质软土基坑而言,其变形值相对偏大。本工程的成功经验可供类似基坑工程设计、施工参考。 Taking an ultra deep foundation pit project in Kunming as an example, the feasibility and application of the inner ring support structure in deep peat soil are analyzed and discussed. The displacement and stress monitoring results of the foundation pit supporting structure show that the annular inner support structure can overcome the shortcomings of poor anchorage force and easy slack deformation in the peat soil, and has the advantages of reasonable force performance, convenient construction and economy, Similar silt soft soil foundation pit, the deformation value is relatively large. The successful experience of the project for similar pit engineering design, construction reference.