A Study on Distributed Optical Fiber Sensing Field Technology of Mining Overburden Deformation

摘要

The principle of distributed optical fiber sensing technology based on BOTDR was introduced in this paper.A mineral exploration hole in Huaibei was selected to do a field study on distributed optical fiber sensing technology for the monitoring of 10414 mining face overburden deformation combined with coal mining process.Mining overburden deformation of workface 10414 was systematically studied from the aspects of fiber laying process, monitoring program selection and data analysis.The deformation of coal mining overburden was analyzed.The monitoring results show that: during the mining process, there is a fracture surface between the bottom of the upper igneous rocks and the lower part of the rock.The separation occurs along the fracture surface in the lower part of the rock along with slip oblique to coalface.The bottom of the under igneous rock to lower rock is compressed by the action of gravity of the overlying rock, meanwhile the amount of deformation is increasing.It validates effectively the feasibility of BOTDR sensing technique for detecting the mining overburden deformation, and provides a novel monitoring technique which helps to ensure a safe and efficient production of coal mining.