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开发了一套基于现代光纤光栅传感技术的测试系统和方法,用于测量振动台试验中模型土体内部的侧向变形的一维分布。将分布式光栅传感器黏贴在基底梁上,并植入土体,考虑土体与植入其中的柔性梁共同运动,利用光纤布拉格光栅(FBG)采集植入梁的变形信息,运用连续体力学的方法,计算得到植入梁周围土体的侧向扩展及剪应变沿深度的一维分布。将现代光学传感技术与传统土工试验技术相结合,应用FBG传感器支持单通道多测点,微型轻质及抗电磁干扰等特点,该系统对周围土体扰动小,导线数量也极少,并且信号不受其他传感器电磁信号的干扰。通过一次小型振动台试验,展示了该方法的可操作性,并与加速度记录信号进行对比,验证了方法的适用性。
A test system and method based on modern FBG sensing technology was developed to measure the one-dimensional distribution of lateral deformation in the model soil subjected to shaking table test. The distributed grating sensor is pasted on the base beam and implanted into the soil. Considering the joint movement between the soil and the flexible beam implanted in it, the deformation information of the implanted beam is acquired by fiber Bragg grating (FBG) The lateral expansion of soil around the implanted beam and the one-dimensional distribution of the shear strain along the depth are calculated. The combination of modern optical sensing technology and traditional geotechnical test technology, the application FBG sensor supports single-channel multi-measuring point, miniature lightweight and anti-electromagnetic interference characteristics of the system of small disturbance to the surrounding soil, the wire is also very small, and Signal from other sensors electromagnetic interference. Through a small shaking table test, the feasibility of the method is demonstrated and compared with the acceleration recorded signal to verify the applicability of the method.