物理模型试验光纤传感技术测试方法分析  

Analysis of test method for physical model test based on optical fiber sensing technology detection

作　　者：柴敬[1,2] 杜文刚 袁强[1] 张丁丁[1,2] CHAI Jing;DU Wen-gang;YUAN Qiang;ZHANG Ding-ding(College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education, Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054

出　　处：《西安科技大学学报》2018年第5期728-736,共9页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金(41027002);高等学校博士学科点专项科研基金(20126121110003)

摘　　要：地下工程常处于复杂三向应力状态,立体模型更能真实反映采场围岩应力状态。将传感光纤分别布置于几何尺寸为3 000 mm×200 mm×1 280 mm平面应力模型和3 600 mm×2 000 mm×2 000 mm立体模型中,分析工作面与光纤不同空间位置时模型应变分布规律。结果表明:传感光纤在模型相似材料铺装前应施加轴向预应力,保持光纤处于预拉状态;温度定位法可实现光纤精准空间定位,当试验环境温度变化明显时,需对传感光纤进行温度补偿以消除温度效应引起的应变测量误差;采动岩体应变分布呈现3个阶段:工作面靠近光纤时,超前支承压力引起下位覆岩应变呈负向台阶变化;工作面过光纤时,垮落、离层区岩层断裂下移引起应变曲线正向台阶变化;工作面远离光纤后,采空区重新压实导致光纤处于受压状态,研究结果对岩土工程类立体模型试验监测具有一定借鉴意义。Underground engineering is often in the complex three-dimensional stress state,three-dimensional model can actually reflect the stress state of surrounding rock.The sensing fibers are arranged in the plane model with the size of 3 000 mm×200 mm×1 280 mm and the three-dimensional model with the size of 3 600 mm×2 000 mm×2 000 mm,the strain distribution of the model has been analyzed when the working face and the fiber are in different positions.The results show:Sensing fiber should be applied with axial pre-stressing to keep the fiber in pre-tensioned state;Temperature positioning method can achieve fiber spatial positioning;When the temperature changes significantly,the result must be compensated to eliminate the strain measurement error caused by the temperature effect;the strain shift of the optical fiber is in three stages:when the working face is close to the fiber,the strain curve shows a negative step change caused by the lead abutment pressure;when the working face crosses the fiber,the strain curve shows a positive step change because the fracture rock move downward;after the face far away from the fiber,the caving zone re-compaction causes the optical fiber to be under pressure state.

关 键 词：矿业工程 模型试验 测试方法 光纤传感 应变监测 

分 类 号：TD325[矿业工程—矿井建设]