围岩三维应力光栅监测方法及相似模拟实验研究  

Study on the monitoring method of three-dimensional stress with FBG in surrounding rock and the simulation experiment

作　　者：魏世明[1] 马智勇 李宝富[1] 柴敬[3] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]河南大有能源股份有限公司耿村煤矿,河南义马472431 [3]西安科技大学能源学院,陕西西安710054

出　　处：《采矿与安全工程学报》2015年第1期138-143,共6页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(51004042);国家自然科学基金仪器专项基金项目(41027002)

摘　　要：为了实现对采动下围岩三维应力状态及变其化规律的有效监测,采取了光纤光栅的监测方法,并进行了相关的相似模拟实验。在橡胶基质的立方体表面分别粘贴3根与x,y,z方向平行的光纤光栅,形成了对三维应力敏感的测试结构;以广义胡克定律为基础,推导了光纤应变与岩体应力之间的力学关系,并进行了相关力学标定实验。结果表明传感器对三维应力具有良好的力学响应特性,应力的灵敏度系数λ1,λ2分别为0.047 14和0.021 84ε/MPa;对相似模拟实验中采动影响下三维应力变化过程进行了监测,结果表明,传感器可以实现相似模型内部三维应力变化的监测,监测结果与实际变化规律相一致,可满足岩体内部三维应力监测的要求。To achieve effective monitoring of three-dimensional stress state in surrounding rock and its change law with mining, the fiber Bragg grating（FBG） sensing has been used and the correlative simulation experiment has been carried out. The test structure sensitive to three-dimensional stress has been formed by respective pasting three fiber gratings parallel to x,y and z direction on the rubber matrix cube surface. Based on the generalized Hooke law, the mechanical relationship between the fiber＇s strain and the rock＇s stress has been derived, and the correlative mechanical calibration experiment has been performed. The result indicates that the sensor has a good mechanics response characteristics to three-dimensional stress, and the sensitivity coefficients of stress λ1 and λ2 are respectively 0.047 14 and 0.021 84 ε/MPa. In addition, the three-dimensional stress change in the simulation experiment during mining has been tested. The result indicates that the sensor can achieve the monitoring of three-dimensional stress in simulation models, and the result is consistent with the actual change process, and it can meet the requirement of rock three-dimensional stress detection.

关 键 词：围岩 三维应力 光纤光栅 相似模拟实验 监测 

分 类 号：TD315[矿业工程—矿井建设]