基于水平位移反演法的桩锚支护结构桩身弯矩计算方法的研究

摘要

Based on a deep foundation pit project in Baoan District of Shenzhen City,the bending moments of pile are inversely calculated by using the monitoring data of horizontal displacement of lateral deep soil of pileanchor structure.At the same time,on the basis of the traditional three point fixed circle method,least square method and natural spline method,the improved least square method and the improved natural spline method are proposed;and then the two methods are used to inversely calculate the moments of the retaining piles.Finally,the inversely calculated bending moments and the measured moments of piles are compared.The results show that the two methods are reasonable and accurate.The inverse calculation of bending moments successfully solves the problem of much expenses and easy destruction of measuring points in actual foundation pit monitoring and produces greater economic and social benefits.%本文以深圳市宝安区某深基坑工程为依托,利用桩锚结构外侧深层土体水平位移的监测数据对支护桩弯矩进行反演研究.在传统的三点定圆法、最小二乘法、自然样条法反算弯矩的基础上提出了改进的最小二乘法和改进的自然样条法,并利用两种方法反演支护桩弯矩,最后将反演弯矩与支护桩实测弯矩进行对比,对比结果表明了两种改进方法的合理性以及精度问题.弯矩反演成功地解决了实际基坑监测中弯矩监测费用大、测点易破坏的难题,产生了较大的经济效益和社会效益.