A method for computing unsupported roof distance in roadway advancement and its in-situ application  

作　　者：Chen Yong Bai Jianbiao Yan Shuai Hao Shengpeng Dao Viet Doan 

机构地区：[1]State Key Laboratory of Coal Resource and Safe Mining, Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining and Technology, Xuzhou 22116, China [2]Hanoi University of Mining and Geology, Hanoi 10000, Viet Nam

出　　处：《International Journal of Mining Science and Technology》2016年第4期551-556,共6页矿业科学技术学报（英文版）

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)

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.

关 键 词：Unsupported roof distance （URD）Roadway advancement Difference method Roof stress Drivage per cycle Unsupported roof distance test 

分 类 号：TD353[矿业工程—矿井建设]