土压力不平衡情况下深基坑支护设计与实践

Design and practice of deep foundation pits under unbalanced earth pressure

以广州某深大基坑工程为背景,基于该基坑周边地形北高南低的工程特点,通过支护结构选型对比分析,辅以三维数值计算,最终选择大直径混凝土灌注桩与角撑或对撑桁架相结合的支护结构体系,协调基坑南北土压力不平衡产生的变形,保证了基坑及周边环境的安全及工程的顺利实施,最后将基坑实施期间的各项监测数据和三维数值计算结果进行对比分析,表明支护方案选型合理,实施效果良好。

Based on a deep foundation pit project under the unbalanced earth pressure in Guangzhou, selection of supporting structures is comparatively analyzed using three-dimensional numerical calculation. Through the combined system of large-diameter concrete piles and concrete corner support or truss support, the deformation generated by the unbalanced earth pressure at the north and south sides of the foundation pit is coordinated. The security of foundation pit and surrounding environment is ensured. The monitoring data and the deformation characteristics of the retaining structures show that the combines support achieved a good effect.