【摘要】 利用BOTDA分布式光纤传感技术,将普通H型钢改造成为具有自感知能力的桩体,使之能够在基坑开挖过程中自动获取H型钢翼缘应变、桩身弯矩、挠度等受力变形数据;通过对H型钢受力结构的分析,提出了不需要确定中性面位置的桩身弯矩连续计算方法,实现了桩身测量的温度自补偿。该技术在某基坑工程中的成功应用表明,它具有良好的现场适应性,可以对基坑安全进行远程实时监测,并具有分布式测量、温度自补偿等优点,可作为一种新型的基坑围护结构加以推广应用。更多还原

【Abstract】 By using BOTDA distributed optical fiber sensing technology,the ordinary H-pile is transformed into a pile body with a self-sensing ability,so that it can automatically acquire structural health data like strain,bending moment,deflection and so on during excavation process.Through analysis of the forces acting on the H-pile,a method for continuous calculation of bending moment of the piles,which doesn’t need to determine the location of neutral face,is proposed,and it can make temperature compensation.The technology has been applied in a foundation pit,and the a successful application shows that it has good in-situ adaptability.It can be employed to monitor the real-time deformation of the foundation pit.Moreover,it has some advantages like distributed measurement,temperature self-compensation,etc.,therefore it can be widely used as a new type of protective structure in foundation pits.更多还原