CAJ | 학술논문

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0.04714和0.02184ε/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。
위료실현대채동하위암삼유응력상태급변기화규률적유효감측，채취료광섬광책적감측방법，병진행료상관적상사모의실험。재상효기질적립방체표면분별점첩3근여x，y，z방향평행적광섬광책，형성료대삼유응력민감적측시결구；이엄의호극정률위기출，추도료광섬응변여암체응력지간적역학관계，병진행료상관역학표정실험。결과표명전감기대삼유응력구유량호적역학향응특성，응력적령민도계수λ1，λ2분별위0.04714화0.02184ε/MPa；대상사모의실험중채동영향하삼유응력변화과정진행료감측，결과표명，전감기가이실현상사모형내부삼유응력변화적감측，감측결과여실제변화규률상일치，가만족암체내부삼유응력감측적요구。
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 simu-lation 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 ma-trix 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 stressλ1 andλ2 are respectively 0.047 14 and 0.021 84ε/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.