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对莞惠城际轨道某深基坑开挖过程中的周边地表沉降、桩顶水平位移、围护桩体深部水平位移、围护桩体钢筋应力等监测数据进行分析,得出一些有意义的结论和建议。实测结果表明:最靠近基坑边缘的土体沉降变化最敏感;不同位置、不同深度处的桩体深部水平位移与该位置的土质有很大关系,桩体深部水平位移小于桩顶水平位移,桩体深部水平位移变化规律与桩顶水平位移的具有一定同步性,且桩顶水平位移变化较深部水平位移变化更敏感;桩体钢筋最大应力出现在桩体上半段,在基坑支护设计中可考虑加强围护结构上部结构的强度;桩体钢筋应力变化先于桩体深部水平位移变化,而与基坑边缘地表沉降变化具有一定同步性,在基坑监测中,可着重加强对围护结构钢筋应力及基坑边缘地表沉降的监测。
In the process of excavation of a deep foundation pit in Wanghui inter-city orbit, the surrounding ground surface settlement, the horizontal displacement of pile top, the horizontal displacement of retaining pile body in depth, the reinforcement stress of retaining wall and so on are analyzed, and some meaningful Conclusions and recommendations. The measured results show that the settlement of the soil mass near the foundation pit is the most sensitive. The horizontal displacement of deep piles at different positions and depths is closely related to the soil quality at this position. The horizontal displacement of deep piles is less than the horizontal displacement of piles, The horizontal displacement of deep pile has a certain synchronization with horizontal displacement of pile top, and the horizontal displacement of pile top is more sensitive to horizontal displacement than that of deep pile. The maximum stress of pile appears in the upper half of pile, The strength of the superstructure of the retaining structure can be considered in the design. The change of the stress of the reinforcement in the piles is prior to the horizontal displacement in the deep part of the piles, and has some synchronization with the settlement of the ground surface at the edge of the foundation pit. Stress of Reinforcement in Envelope and Monitoring of Ground Settlement at Foundation.