6 m巷高综放工作面切顶留巷关键技术

Key technology of cutting roof in fully mechanized caving face with a height of 6 m

为解决韩城矿业公司桑树坪二号井无煤柱开采沿空留巷引起的巷道顶板下沉、底鼓严重等问题,进行了6 m大采高综采放顶煤切顶沿空留巷的现场试验和施工;通过聚能爆破的方式对留巷进行了超前切顶,切断巷道直接顶和部分基本顶,改变巷道围岩应力分布特征,为巷道在采动影响期间的稳定提前进行卸压处理;工作面推采期间,留巷采用"锚索+钢梁+巷内钢管混凝土支柱"补强支护,能够适应巷道围岩大变形的要求。

In order to solve the problem of roof sinking and serious floor heave caused by mining without coal pillar in No.2 coal mine of Sangshuping in Hancheng Mining Area, the field test and construction of roadway retaining along gob in fully mechanized caving coal with a height of 6 m were carried out. Advanced roof cutting was carried out for the roadway retaining by means of energy-gathered blasting, the direct roof and part of the basic roof of the roadway are cut off to change the stress distribution characteristics of the surrounding rock of the roadway, and the pressure-relief treatment is carried out in advance for the stability of the roadway during the influence of mining. During the working face advancing and mining, the retaining roadway is reinforced with "anchor cable + steel beam + concrete filled steel tube pillar in the roadway", which can meet the requirements of large deformation of roadway surrounding rock.