软体排塌陷弯曲变形的应变响应特征分析

Strain response characteristics to subsidence deformation of flexible mattress

软体排是长江中下游航道主要的洲滩防护结构,其变形的应变响应特征对评估分析软体排服役状态具有重要意义,目前对此研究较少。针对目前软体排塌陷变形应变响应特征研究存在的难点,开展模型试验,研究软体排塌陷弯曲变形下的应变响应特征,并提出排体塌陷变形的识别方法。结果表明:排体塌陷变形时断面应变呈“双峰”型的分布特征;该分布特征是由于内部排体弯曲变形并向内卷缩,通过定点处的固定作用带动光纤受压,导致该部分感测光纤呈现负应变而形成。

The flexible mattress is the main beach protection structure in the middle and lower reaches of the Yangtze River,the strain response characteristics of its deformation are important for evaluating and analyzing the service state of the flexible mattress,there are few studies on this.To address the current difficulties in the study of the strain response characteristics to the subsidence deformation of flexible mattress,we carry out the model experiments,and study the strain response characteristics under the subsidence deformation of flexible mattress to propose the identification method of subsidence deformation.The results show that the section strain response to the subsidence deformation of the flexible mattress can be characterized as“bimodal”distribution.This distribution feature is formed by the internal mattress bending and coiling inward,driving the fiber under pressure through the fixation at the fixed point,resulting in a negative strain in that part of the sensing fiber.