摘要
A reasonable unsupported roof distance(URD) when advancing underground coal mine roadways can contribute greatly to safe and rapid roadway development.A mechanical model of the roof,using the relationship between the roof stress distribution and URD,obtained by the difference method,and roof stability according to the in-situ roof stress and rock mass strength was developed.We subsequently designed a proper range of URD,developed a testing method of URD with the function of mining protection,evaluated roof stability through analyzing the test data and then determined a reasonable URD.Considering the factors of the geological conditions,the immediate roof stability and the efficiency of the labor arrangement system,the URD of the advancing roadway of 9802 working face in Zhangshuanglou coal mine was determined to be 6 m using the proposed method.The results show that,when a 2 m length of roadway was reinforced by temporary support and high pre-stressed bolt support after the roadway advancement of 6 m per cycle,the speed and the security of the roadway development can be achieved and the advance rate can reach more than 400 m per month.
A reasonable unsupported roof distance （URD） when advancing underground coal mine roadways can contribute greatly to safe and rapid roadway development. A mechanical model of the roof, using the relationship between the roof stress distribution and URD, obtained by the difference method, and roof stability according to the in-situ roof stress and rock mass strength was developed. We subsequently designed a proper range of URD, developed a testing method of URD with the function of mining protection, evaluated roof stability through analyzing the test data and then determined a reasonable URD. Considering the factors of the geological conditions, the immediate roof stability and the efficiency of the labor arrangement system, the URD of the advancing roadway of 9802 working face in Zhangshuanglou coal mine was determined to be 6 m using the proposed method. The results show that, when a 2 m length of roadway was reinforced by temporary support and high pre-stressed bolt support after the roadway advancement of 6 m per cycle, the speed and the security of the roadway development can be achieved and the advance rate can reach more than 400 m per month.
基金
supported by the State Key Laboratory of Coal Resources and Sate Mining,China University of Mining and Technology (No.SKLCRSM13X07)
the National Natural Science Foundation of China (No.51174195)
Chinese National Programs for Fundamental Research and Development (No.2013CB227900)
the Fundamental Research Funds for the Central Universities (No.2014XT01)
关键词
井下巷道
现场应用
板间距
顶板稳定性
计算
护顶
稳定性评价
预应力锚杆
Unsupported roof distance （URD）Roadway advancement Difference method Roof stress Drivage per cycle Unsupported roof distance test
