基于BOTDA的抗滑桩受力分析研究

Research on Stress Analysis of Anti-slide Pile Based on BOTDA

以某高速公路边坡为例,基于BOTDA分布式光纤传感技术对抗滑桩进行长期、高精度、分布式的应变监测,以光纤监测数据为基础反分析抗滑桩受力状态下的内力分布情况,对比抗滑桩相应的材料强度设计指标以评价抗滑桩的工作状态。结果表明,采用BOTDA的桩身应力应变计算方法,无需过多的经验性参数,即可获取抗滑桩的桩身内力分布情况。在此基础上,通过对比分析抗滑桩的轴向应力与材料设计强度指标,发现抗滑桩目前处于安全状态,且有一定安全储备。

Taking an expressway slope as the example,the long-term,high-precision and distributed strain monitoring of anti-slide pile is carried out based on BOTDA distributed optical fiber sensing technology.The internal force distribution of anti-slide pileunder stress state is back analyzed based on optical fiber monitoring data,and the working state of anti-slide pile is evaluated by comparing the corresponding material strength design index of anti-slide pile.The results show that the internal force distribution of anti-slide pile is obtained based on BOTDA pile stress-strain calculation method without too many empirical parameters.On this basis,it is found that the anti-slide pile is in a safe state and has a certain safety reserve,through the comparative analysis of axial stress and material design strength index.