Design and application of solid, dense backfill advanced mining technology with two pre-driving entries  

作　　者：Zhang Qiang Zhang Jixiong Guo Shuai Gao Rui Li Weikang 

机构地区：[1]School of Mines, China University of Mining & Technology [2]Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining & Technology

出　　处：《International Journal of Mining Science and Technology》2015年第1期127-132,共6页矿业科学技术学报（英文版）

基　　金：supported by the Fundamental Research Funds program for the Central Universities (No. 2014RC02);the Research Innovation Program for College Graduates of Jiangsu Province (No. CXLX13_951);Qing Lan Project

摘　　要：New solid backfill mining technology provides unique technical advantages for ‘‘three-under'' coal mining which refers to coal resources trapped under buildings, railways, and water bodies. This technology has a much higher recovery rate and can effectively control the surface subsidence. However, successful application of this technology depends heavily on geological conditions. To avoid the disadvantages associated with downward mining and overhead backfilling with this new technology, a new advanced solid backfill mining design with two pre-driving entries is proposed here to ensure the backfill effect. Taking Huayuan coal mine as an example, this paper tests the double gob-side entries retaining with no pillar left scheme and optimizes an integrated technology setup for backfill mining and gob-side entry retaining. Field applications show that the recovery rate increased from 40% for strip mining to 85% for backfill mining. Moreover, the new backfill technology allowed for better control over the surrounding rock deformation caused by the gob-side entry retaining effect and better control of ground subsidence as compared to strip mining.New solid backfill mining technology provides unique technical advantages for ＂three-under＂ coal min- ing which refers to coal resources trapped under buildings, railways, and water bodies. This technology has a much higher recovery rate and can effectively control the surface subsidence. However, successful application of this technology depends heavily on geological conditions. To avoid the disadvantages asso- ciated with downward mining and overhead backfilling with this new technology, a new advanced solid backfill mining design with two pre-driving entries is proposed here to ensure the backfill effect. Taking Huayuan coal mine as an example, this paper tests the double gob-side entries retaining with no pillar left scheme and optimizes an integrated technology setup for backfill mining and gob-side entry retain- ing. Field applications show that the recovery rate increased from 40~; for strip mining to 85% for backfill mining. Moreover. the new backfill technology allowed for better control over the surrounding rock deformation caused by the gob-side entry retaining effect and better control of ground subsidence as compared to strip mining.

关 键 词：Two pre-driving entriesGob-side entry retainingSolid backfill miningStrip miningGround subsidence contro 

分 类 号：TD823.7[矿业工程—煤矿开采]