North China Lower Coal Surrounding Rock Failure Characteristics Study Based on FLAC3D and Fiber Bragg Grating

Abstract:

In order to study north China type coal field lower coal surrounding rock failure characteristics, a numerical model was built based on the numerical simulation software FLAC3D. Water inrush information was monitored during mining process based on optical fiber Bragg grating sensor technology. Lower coal surrounding failure characteristics were studied according to numerical simulation and monitoring results. This study show that the first weighting distance of the test face is from 35m to 40m and the periodic weighting step distance is from 10m to 20m. Coal floor can be divided to three areas which are increased stress area, decreased stress area and recovery stress area. Coal roof failure scope is like a composition of two saddle-shaped zones along trend and tendency directions. Normal failure depth of the test face floor is from 10m to 12.5m, and it can reach 22.5m near open-off cut and stop line. The research can explain the reason of the test faces water inrush accident and can direct lower coal mine water control work.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 1057-1062
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.1057
• Online since: August 2013
• Authors: Zai Bin Liu
• Keywords: Failure Characteristics, Fiber Bragg Grating (FBG), FLAC^3D, Lower Coal, Surrounding Rock

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