In order to effectively control the deformation of surrounding rock in the withdrawal channel of 3205 fully-mechanized mining face,the instability width of coal pillar between the withdrawal channel and the mining face was determined by theoretical analysis,and the surrounding rock control technology scheme of the withdrawal channel was developed based on engineering analogy.When the withdrawal channel was excavated,the combined support of anchor net and cable was adopted.When the distance between the channel and the mining face was 60 m,the shed(one beam and two columns,the distance between the sheds was 1 600 mm)and the through-side coal wall grouting were adopted for reinforcement.When the distance between the channel and the the mining face was 5.25 m,the yield pressure measures were adopted.At the same time,the stability of the surrounding rock of the withdrawal channel can be ensured by laying nets and adjusting supporting methods when the mining face was connected with the withdrawal channel.After engineering application,the surrounding rock of the withdrawal channel was always stable during the final mining of the mining face,and the maximum displacement of the roof and floor of the withdrawal channel and the two sides were 152 mm and 96 mm respectively when the mining face was connected,and the deformation of the surrounding rock was small,which can meet the need of efficient withdrawal of mining face equipment.
关键词
煤炭开采/回撤通道/围岩支护/矿压显现
Key words
coal mining/withdrawal channel/surrounding rock support/strata behaviors
维普
万方数据