CAJ | 학술논문

为了检测锚杆的应力分布状态，采用光纤光栅传感技术搭建了锚杆支护质量的长期在线监测系统。在实验室模拟巷道中锚杆的受力过程，进行了锚杆拉拔试验。在试验中用光纤布拉格光栅检测锚杆应变，利用高斯函数对锚杆杆体上应变的实测数据进行拟合，得到锚杆的轴力和剪应力分布情况。试验结果表明：用光纤布拉格光栅技术检测锚杆的应力应变具有可行性；高斯函数可以准确地拟合全锚锚杆的轴力；高斯函数的拟合参数t与岩体对锚杆的握裹程度有关，它变化方向的转折表明了杆-岩界面状态的转变，岩体对杆体的握裹能力开始降低。研究结果为锚杆锚固质量的在线检测提供了一种手段。
위료검측묘간적응력분포상태，채용광섬광책전감기술탑건료묘간지호질량적장기재선감측계통。재실험실모의항도중묘간적수력과정，진행료묘간랍발시험。재시험중용광섬포랍격광책검측묘간응변，이용고사함수대묘간간체상응변적실측수거진행의합，득도묘간적축력화전응력분포정황。시험결과표명：용광섬포랍격광책기술검측묘간적응력응변구유가행성；고사함수가이준학지의합전묘묘간적축력；고사함수적의합삼수t여암체대묘간적악과정도유관，타변화방향적전절표명료간-암계면상태적전변，암체대간체적악과능력개시강저。연구결과위묘간묘고질량적재선검측제공료일충수단。
In order to detest the stress distribution of the anchor bolts, a fiber Bragg grating(FBG) opt-ical fiber sensing technology was adopted to build a long-term bolting quality online monitoring system .. The rock bolting process and forces existing in a coal mine tunnel are simulated in the laboratory and the bolt pullout test has been conducted. By fiber Bragger grating the strains of the anchor bolt are measured. Then the strain dates are fitted with Gauss function. The axial stress distribution and the shear stress distribution are got. The experiment results show that it is feasible to test strain of the anchor bolt by FBG. The axial stress can be fitted accurately by Gauss function. The parameter t of the Gaussian function is related to the grip ability of the rock. The shift in changing direction of parameter t indicates that the interface between the rock and the bolt is changing and the grip ability of the rock begins de-clining. The research result can be a reference for the real-time monitoring of anchor bolt quality.