Roadway Protection by Roof-Cutting in the Support Removing Channel of the Long-Wall Mining Face

Abstract

Aiming at strong mining pressure and large deformation of surrounding rock in the main roadway, a mechanical model of the advanced abutment pressure distribution in the long-wall mining face was established. The main reason for the large deformation of the surrounding rock in the main roadway was found to be unreasonable position of the stop line, which brings the main roadway under the influence of mining operations. Therefore, on the premise of an unaltered stop line, the technique of cutting the roof and use of pressure relief to protect the main roadway were proposed. The technique will form a weak surface along the stop line, blocking the rock layer from transmitting the abutment pressure. Engineering practice shows that by using the advanced roof cutting and pressure-relief technique, the abutment pressure on the long-wall mining face is reduced and the main roadway is protected.

Study of Overlying Rock Structure and Intensive Pressure Control Technology of Island Longwall Panel in Extra-Thick Coal Seams

“…8102. As shown in the figure, 1 the plastic deformation of the coal body in the longwall panel no. 8102 is the most severe, especially the advanced coal body on one side of the 8101 gob; 2 during the mining process of longwall panel no.…”

“…Xingyun Ren [1] proposed to reduce the support pressure of the working face and protect the main roadway through roof cutting and pressure relief. Mingshi Gao [2] proposed a support plan that combines "active anchor cable support, hydraulic lifting support, and soft structure energy absorption".…”

Study on Characteristics of Front Abutment Pressure and Rational Stop-Mining Coal Pillar Width in Large Height Working Face

“…Zhang et al reduced the width of the stop-mining coal pillar by reducing the abutment pressure peaks and the surrounding rock stresses in the roadway through blasting and roof-cutting techniques [30,35,36]. Zhang replaced some of the stop-mining coal pillars with concrete fillers in the withdrawal tunnel, which improved the recovery rate of coal resources [37]. In addition, Malashkevych et al effectively reduced the roof stress intensity by leaving waste rocks in the mined-out space, which also provided a new idea for reducing the width of the SMCP [38,39].…”