基于相似材料的光纤应变传感器在分区破裂模型试验中的研究  

Study of FBG strain sensors based on similar materiel in zonal disintegration model test

作　　者：王静[1,2] 李术才[3] 隋青美[1] 张强勇[3] 陈旭光[3] 王正方[1] 白涛[1] 施斌[2] 

机构地区：[1]山东大学控制科学与工程学院光纤传感技术与工程研究中心,山东济南250061 [2]南京大学地球科学与工程学院,江苏南京210093 [3]山东大学岩土与结构工程研究中心,山东济南250061

出　　处：《煤炭学报》2012年第9期1570-1575,共6页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(41172268)

摘　　要：基于模型相似材料研制了适用于地质力学模型试验的光纤光栅应变传感器,能够同时实现横向、纵向和切向3个方向的应变测量。将7个光纤应变传感器依次预埋在模型巷道的左边墙,采用波分复用技术组成光纤传感网络,实现对模型内部应变分布的实时监测。光纤传感器的监测结果表明,在巷道开挖过程中,深部巷道周围径向应变值没有表现出随距离巷道远近而递减的规律,而是呈波浪形分布;超载试验完成后,巷道周围径向应变值依然呈波浪形分布。最后将模型剖开,成功观测到了高地应力深部巷道围岩的分区破裂现象,同时验证了设计的光纤光栅应变传感器的可靠性。FBG（ Fiber Bragg Grating） strain sensors based on similar material were designed according to the size of the geological mechanics model test, which can detect transverse, longitudinal and tangential strain synchronously. Then 7 FBG strain sensors were pre-embedded successively at left of laneway surrounding rock. Whereafter, fiber op- tics sensing network was built by adopting WDM （Wavelength Division Multiplexing） to real-timely monitor strain of the model test. The results detected by FBG strain sensors indicate that the radial strain of deep laneway surrounding rock does not descent with distance to laneway in laneway excavating experiment, while it presents as undulant ar- rangement, and the radial strain still presents as undulant arrangement with the distance to laneway in laneway excava- ting experiment after overloading experiment. Splitting the model, zonal disintegration of deep laneway wall rock under high ground stress is observed successfully,which validates that the FBG strain sensors are reliable.

关 键 词：光纤光栅 应变传感器 深部巷道 模型试验 分区破裂 

分 类 号：TD322[矿业工程—矿井建设] TP212[自动化与计算机技术—检测技术与自动化装置]