The Relationship between Surrounding Rock Deformation of Roadway Affected by Overhead Mining and Effective Load Coefficient

摘要

According to the characteristic of shorter sustaining time that moving abutment pressure acts on the bottom roadway affected by overhead mining, the forecasting principle of the deformation of bottom roadway affected by overhead mining is put forward, using effective load coefficient of surrounding rock. The insitu measurement is that, if effective load coefficient of surrounding rock C≤0. 439, bottom roadway is in a stable situation while its overhead seam is mined; and if C>0. 439, the relation between the deformation amount of bottom roadway and effective load coefficient is a parabola. At last, the result is utilized to engineering practice, having obtained a predictable effect.