Shaanxi Zhongtai Energy Investment Co., Ltd.

为解决浅埋煤层工作面过沟谷地形上坡段期间的强矿压显现问题,以朱家峁煤矿1305-2工作面为工程背景,采用现场实测的方法对来压前后工作面来压步距和来压强度进行分析,确定工作面各区域矿压显现特征,并且采用爆破预裂技术进行顶板卸压,现场应用后效果良好,保证了后续回采工作面的安全稳定。结果表明,1305-2工作面过沟谷区上坡段期间来压频繁并且发生2次较大的强矿压显现现象。工作面正常回采来压步距为8~16m,来压期间减小为4~6m,来压强度达到45MPa,超过支架额定工作阻力的80%。工作面呈现“两端弱中部强”的矿压显现特征,地表也相应的出现台阶下沉。采用顶板水压致裂技术措施后,工作面来压强度明显降低,实现了工作面的安全生产。

In order to solve the problem of strong mine pressure behavior in shallow coal seam working face when it passedthrough the gully terrain, taking 1305-2 working face of Zhujiamao Coal Mine as an engineering background, the field measurement method was adopted to analyze the weighting step and weighting intensity of the working face before and afterweighting, and the characteristics of mine pressure behavior in each area of the working face were determined. The blastingpresplitting technology was used to relieve the roof pressure, and the field application shows that the effect was good, whichensures the safety and stability of the subsequent mining face. The results show that the 1305-2 working face had frequentweighting during the uphill section of the gully area, and there were twice strong strata behaviors. The weighting interval innormal mining of the working face was 8 ~ 16 m, and was reduced to 4 ~ 6 m during the weighting period, and the weightingintensity reaches 54 MPa, which exceeds 80% of the rated working resistance of the support. The working face was characterized by “ weak at both ends and strong in the middle” , and the ground surface is correspondingly stepped subsidence.Therefore, after adopting the roof hydraulic fracturing technology, the weighting strength of the working face is obviously reduced, achieving the goal of safe production in the working face.