Study on Strata Behavior Regularity in Top-caving Mining Face of Three Soft and Midium- thickness Coal Seams

Abstract：Based on the observation and analysis of strata behavior in top- caving mining face of midium- thickness coal faces in Hongqi shaft, the characteristics of strata behavior can be drawn.The paper evaluates the adaptability and working state of its support, and provides a basis for support selection and has the instructional significance for dip face in the same condition.

Keyword：three soft coal seams;top-caving mining;characteristic of strata behavior;