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通过对相邻基坑分期开挖围护统筹设计的工程实例分析,并结合实测结果进行了研究。研究表明,对先期侧限要求较低的纯地下结构项目,侧墙与围护体间空隙回填素混凝土,不仅交界面处围护桩设计时可不考虑后期挖深变深的影响,且能使后期基坑支撑系统中对撑轴力明显减小;大底板的形成可削弱围护桩对内支撑系统产生的支点力。在地下结构未形成完整封闭框架体系情形下,提出了底板、中楼板能否作为换撑传力载体的判断依据及替代方法。总结了先、后期相邻基坑交界面区域止水、降水设计的针对性方案。可供类似基坑围护设计时参考。
Through the analysis of the engineering example of the co-ordinated excavation design of the adjacent excavation staged excavation, the research is carried out based on the measured results. The research shows that for purely underground structures with low initial confinement requirements, the void backfill concrete between the side wall and the enclosure body can not consider the effect of deepening and deepening of deep excavation at the design of the retaining pile at the interface, In the late foundation pit support system, the supporting axial force is obviously reduced; the formation of the large bottom plate can weaken the fulcrum force generated by the retaining pile on the inner support system. Under the situation that the underground structure does not form a complete closed frame system, it is proposed that whether the floor slab and the middle slab can be used as the carrier of force transmission in order to change the bearing and the alternative method. Summarizes the first, late adjacent base pit interface sealing, targeted design of precipitation programs. For similar design of foundation pit envelope design.