论文部分内容阅读
提出了一种基于布里渊散射光时域反射监测技术(BOTDR)的基坑锚杆(索)分布式检测方法,包括:适用于锚杆(索)检测的金属基索状应变感测光缆和紧包护套感测光缆,感测光缆铺设方法,数据采集,锚杆(索)轴力与侧摩阻力计算,锚固性能评价。最后以南京某基坑为例,利用该方法对3种不同锚杆(索)进行了现场拉拔测试。结果表明该方法可以获得沿锚杆(索)各点的应变值,实现全分布式测量,方法可行,结果准确。
A distributed detection method based on Brillouin scattered light time domain reflectometry (BOTDR) is proposed, which includes the following: a metal base strain sensing fiber cable And tight sheath sensing cable, sensing cable laying method, data acquisition, anchor (cable) axial force and side friction resistance calculation, anchoring performance evaluation. Finally, taking a foundation pit in Nanjing as an example, three different bolts (cables) were tested by the method. The results show that the method can get the strain value along each point of the anchor (cable), achieve full distributed measurement, the method is feasible and the result is accurate.