The technology for gob-side entry retaining in steep coal seams is still in the development stage. The
analysis results of the caving structure of main roof, low influence of gateway’s stability because of long
filling distance and weak dynamic effect of the gateway, and the low stress redistribution environment
indicate that using this technology in steep coal seams has significant advantages. Moreover, to reinforce
the waste rock and the soft floor and to better guard against the impact of the waste rock during natural
filling, a rock blocking device and grouting reinforcement method were invented, and theoretical calculations
result show that the blocking device has high safety factor. In addition, we also developed a set of
hydraulic support devices for use in the strengthening support zone. Furthermore, because the retaining
gateway was a systematic project, the selection of the size and shape of the gateway cross section and its
support method during the initial driving stage is a key step. Thus, first, a section the size of bottom width
and roof height of a new gateway was determined to meet any related requirements. Then, according
to the cross sections of 75 statistical gateways and the support technique, it chosen a trapezoidal cross
section when the dip of the coal seam is 35° < α ≤ 45°, a special and an inclined arch cross section when
45° < α ≤ 55°. Eventually, a support system of bolts and cables combined with steel mesh and steel belts
was provided. The support system used optimized material and improved parameters, can enhanced the
self-bearing ability of the surrounding coal and rock masses.