土工离心机光纤光栅测试系统及其模型试验研究

Fiber Bragg grating test system and model tests based on geotechnical centrifuge

光纤光栅传感技术(Fiber Bragg Grating,简称FBG)具有准分布、测量精度高、抗电磁干扰强和实时监测等优点,其传感器可根据监测对象要求小型化。介绍了一套土工离心机光纤光栅测试系统,包括系统的软硬件构成,FBG解调仪,FBG传感器小型化,锚杆、桩基、测斜管以及挡土墙感测模型的制作工艺等。通过一组土工离心机边坡模型试验,验证了该系统应用于土工离心机模型多参量监测的可行性,显示出该系统具有结构简单,测量内容多,测试精度高,量程大,抗电磁干扰强,系统工作稳定,配套光纤光栅传感器重量轻、体积小、可准分布布设、形成整体监测网络等优点,为土工离心机试验监测提供了一种新的手段。

The fiber Bragg grating （FBG） sensing technology has many advantages such as associate distribution, high precision, anti-electromagnetic, real-time monitoring, etc., and the sensors can be miniaturized according to monitoring objects. A set of FBG sensing monitoring system is introduced, including the software and hardware of the system, the FBG demodulator, the miniaturization of the sensors and the manufacturing process sensing models for anchors, pile foundation, inclinometer pipes and retaining walls. The monitoring data show that the system can be availably applied to geotechnical centrifuge model for multi-parameter monitoring, and it is of advantages such as simple structure, abundant test content, high precision, high range, anti-electromagnetic interference and stable performances. The matching FBG sensors are light and small and can be arranged in the way of associate distribution so as to form an overall monitoring network. The FBG monitoring system may provide a new method for the measurement of geotechnical model tests.