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预应力矩形支护桩是一种钢筋混凝土预制桩,作为新型支护桩已经在基坑工程中得到了一定的应用。为了确保深基坑的安全,需要对支护桩的弯矩承载力发挥程度有清晰了解。但由于矩形支护桩是预制桩,无法对其桩身内力进行监测,根据基坑监测所得的测斜数据进行最小二乘法曲线拟合求得支护桩变形曲线,然后通过变形曲线二次求导后反算出基坑开挖过程中支护桩的实际弯矩。在获得了支护桩弯矩承载力发挥程度的基础上,对矩形支护桩的安全状态进行评估,验证了矩形支护桩应用于基坑支护的安全性。
Prestressed rectangular pile is a reinforced concrete precast pile, as a new type of retaining pile in the excavation project has been a certain application. In order to ensure the safety of deep foundation pit, it is necessary to have a clear understanding of the degree of bearing capacity of the supporting pile. However, because the rectangular support pile is a precast pile, it is impossible to monitor the internal force of the pile body. According to the measured data obtained from the pit monitoring, the least square curve fitting is used to obtain the deformation curve of the pile. Then, Determine the actual bending moment of the supporting pile during the excavation of the foundation pit. On the basis of obtaining the bearing capacity of the supporting pile, the safety status of the rectangular supporting pile is evaluated, and the safety of the rectangular supporting pile applied to the foundation pit supporting is verified.