Analysis of Strata Behavior Process Characteristics of Gob-Side Entry Retaining with Roof Cutting and Pressure Releasing Based on Composite Roof Structure

Table 3

Basic parameters of the 8304 working face.

Coal seam thickness/average thickness (m)	1.80–3.55/3.1	Buried depth (m)	367–411
Mining height (m)	3.1	Coal seam dip angle/average dip angle (°)	2∼6/4
Working face strike length (m)	670	Working face inclination length (m)	127
Immediate roof/thickness (m)	Mudstone/1.47	Immediate floor/thickness (m)	Mudstone/3.2
Main roof/thickness (m)	Fine sandstone/3.88	Main floor/thickness (m)	Siltstone/3.1