Abstract
The evolution of overburden deformation is crucial for safety and environmental efficiency and its monitoring is becoming a key scientific issue. The use of an optical fiber sensor (OFS) for mining engineering is now receiving praise by virtue of its distinct abilities of distribution, high accuracy, and anti-interference measurement. Nevertheless, the dynamic response of OFS monitoring on overburden deformation still needs to be characterized in detail. This paper analyzed the characterization pattern of overburden deformation based on distributed optical fiber sensing (DOFS) by means of an analogue model test. Then, we discuss the influence of rules of optical fiber embedding on a model test in a numerical simulation. The results show that the DOFS monitoring demonstrates the time-space evolution of overburden deformation and the development of three horizontal areas and three vertical zones. A standardization DOFS characterization model is proposed to expound the characterization mechanism of the overburden structure zoning process; the influence of optical fiber embedding on rock displacement in the model test is revealed, and it is found that the displacement error will increase sharply when the fiber diameter is larger than 2 mm. These findings could provide an effective solution for a monitoring method in intelligent mining from the perspective of a theoretical basis and technological system.
Highlights
Underground coal mine exploitation triggers large deformation and extensive movement of rock mass overlying the coal seam, which accompanies the redistribution of internal stress of overburden stratum rock mass
This paper studied the characterization pattern of time-space evolution of overburden deformation based on distributed optical fiber sensing (DOFS) monitoring by analogue model test and numerical simulation
(1) The whole process and full scope dynamic monitoring of the strain distribution of mining-induced overburden deformation is achieved by DOFS monitoring
Summary
Underground coal mine exploitation triggers large deformation and extensive movement of rock mass overlying the coal seam, which accompanies the redistribution of internal stress of overburden stratum rock mass This kinetic process of mining-induced rock failure is the primary factor that impacts mining safety and ecological protection [1,2]. In order to solve the difficulties of underground structural monitoring, a series of monitoring methods for mining overburden rock mechanics based on geophysics techniques have been derived [6,7,8] These have provided solid scientific foundation for studying the movement law of stope surrounding rocks [9], the definition of the water conducting zone [10], and the disaster-causing mechanism of rock dynamic mechanics [11].
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