TITLE:
Comprehensive Experimental Study on the Migration Law of the Floor at the Mining Face
AUTHORS:
Liquan Guo, Zuopeng Jiang
KEYWORDS:
Floor, Water Prevention and Control, Optical Fiber, Resistivity, Electric Current
JOURNAL NAME:
Open Journal of Geology,
Vol.10 No.10,
October
29,
2020
ABSTRACT: Under the circumstance that deep mining is increasingly vulnerable to underlying
limestone water, accurate detection of floor failure depth ranges at a mining
face becomes rather critical to coal mine production in safety. Underground borehole
fiber optic sensing technology is combined with 2-D parallel electrical
surveying to comprehensively monitor and analyze development laws of floor deformation
and failure. Moreover, a working face 1022 in a mine of Huaibei Mining Area was
taken, for example, introducing the layout of monitoring borehole and
installation of relevant sensing units. Based on the stope progress of a
working face, data related to strain and geoelectric fields were collected
regularly to analyze relationships of field source variation characteristics
and strata deformation failures. In this way, the development mechanism of the
floor deformation failure can be revealed. As demonstrated by results, the
depth failure of the floor at coal seam 10 is calculated to be 15 m, while its
disturbance depth turns out to be 22 m. Due to advanced stress, concentrated
stope load and post-mining pressure relief, the floor experienced elastic
deformation, shear deformation and swelling deformation successively. Without a
doubt, testing results obtained have scientific guiding significance for mines
with similar geological conditions.