【摘要】 支护桩是深基坑支护结构中的关键组成部分,其支护效果直接影响到深基坑的稳定性,因此对支护桩应力应变状态的监测十分重要。该文选择了一种能够单端测量的分布式光纤感测技术—布里渊光时域反射计(简称BOTDR),将其应用于深基坑支护桩的变形监测,介绍了这一技术的基本原理、需解决的关键问题及实施技术路线,并结合南京某深基坑工程,验证了这一技术方法的监测效果。结果表明,基于BOTDR的监测方法可以对深基坑支护桩进行全分布式监测,方法可行,结果准确,为深基坑支护桩监测提供了一种新的技术手段。更多还原

【Abstract】 Retaining pile is a key part of bracing and retaining structures which directly affect the stability of deep foundation pit.Therefore, it is important to monitor the strain and stress state of a retaining pile. In this paper, the single-ended detecting distributedoptical fiber sensing technology based on the Brillouin Optical Time-Domain Reflectometer(BOTDR) was used for monitoring thedeformation of a PHC type retaining pile in a deep foundation pit. The monitoring method was described and its effectiveness was wellverified in a deep foundation pit in Nanjing. The results indicate that the BOTDR-based method is feasible to make a fully-distributedmonitoring of the retaining pile in the deep foundation pit. It is expected to be a novel way for monitoring deep foundation pit.更多还原