Abstract:

With the increase of mining depth and the expansion of mining area, traditional supporting way of shallow mining can not adapt to the deep mining problems appeared in this process. Deep coal and rock have remarkable nonlinear mechanical properties such as big pressure, big deformation and difficult support, the roadway support has become an increasingly important issue. Therefore, it is urgent to seek reasonable supporting methods. This paper analysis the lithologic features of -650 level west alleys in Kailuan mining area. The length of service of west alleys decided that we must take effective measures, so as to achieve the purpose of permanent safe use. So we decide to use bolt and grouting reinforced technology to improve the self supporting capacity and bearing capacity of surrounding rock loose circle, and resist the surrounding rock pressure effectively. The research results show that bolt-grouting support has remarkable effect, and obtain good technique and economic benefit.