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立柱桩隆起可能导致基坑内支撑系统失稳,严重时可能导致结构开裂甚至破坏,但是目前尚未有明确、系统的计算方法。基于对基坑卸荷应力与回弹变形的认识,针对不同的开挖工况,分析桩、土间由于回弹影响深度不同而出现的两种相互关系,计算分析了部分典型上部结构的刚度影响,提出了立柱桩隆起的简化计算方法。将计算结果与实测值进行对比验证,提出了部分修正参数,验证了该计算方法的可靠性。
The uplift of studs may lead to the instability of the supporting system in the foundation pit, which may lead to cracking or even destruction of the structure in severe cases. However, there is no clear and systematic calculation method. Based on the understanding of the unloading stress and springback deformation of the foundation pit, according to the different excavation conditions, the two interrelations between pile and soil due to the different depth of springback are analyzed. The stiffness of some typical superstructure is calculated and analyzed. Influence, put forward a simplified calculation method of column pile uplift. The calculated results and the measured values were compared and verified, and some correction parameters were put forward to verify the reliability of the calculation method.