西安科技大学学报2017，Vol.37Issue(2)：187-193,7.DOI:10.13800/j.cnki.xakjdxxb.2017.0207
水压致裂提高块煤率的机理及应用
Mechanism and application of lump coal rate improvement based on hydraulic fracturing
摘要
Abstract
To solve the problems of the large energy consumption and the low lump coal yield of the comprehensive mechanized coal mining(CMCM) for the shallowly buried hard and thick coal seam in the north of Shaanxi Province in the Jurassic period,the coal seam advancing hydraulic pre-splitting method is used for analyzing the influential factors of specific energy consumption at the CMCM face of lump coal creating.The method and approach for reducing the specific energy consumption and improving the lump coal rate at the hard and thick coal seam through the pulse water pre-splitting technique on the basis of optimizing the production process of coal seam have been proposed.The study on the pulse presplitting broken mechanism of the hard and thick coal seam reveals the deep-hole directional pulse presplitting failure law and analyzes the pre-splitting method and the process parameters of hydraulic rock fragmentation at different hard and thick coal seams.The study shows that coal hardness,coal seam fissures and joint development degree are the main factors affecting the specific energy consumption at CM-CM face of the lump coal mining.Through the field test of hydraulic pre-splitting at the representative large-height CMCM face of the shallowly buried coal seam of the Mine 5102 in the north of Shaanxi province,it is found that the cutting fracture linear density at the working face of coal wall increased by about 2 times,the coal cutter energy consumption reduced by 36％,the lump coal rate at the working face increased by 25％,and the coal dust concentration reduced by 35％ on average.Meanwhile,the working face of the large height CMCM coal wall spalling reduced after the advancing hydraulic presplitting.The test verifies the effectiveness of the pulse hydraulic pre-splitting technology in reducing the specific energy consumption and increasing the lump coal rate of the hard and thick coal seam.关键词
浅埋厚硬煤层/大采高综采面/定向水压预裂/块煤率Key words
shallowly buried hard and thick coal seam/large-height comprehensive mechanized coal mining face/directional hydraulic pre-splitting/rate of lump coal分类
矿业与冶金引用本文复制引用
邓广哲,齐晓华,王雷..水压致裂提高块煤率的机理及应用[J].西安科技大学学报,2017,37(2):187-193,7.基金项目
陕西省“13115”科技创新工程重大科技专项(2009ZDKG57) （2009ZDKG57）
科技支疆重大专项项目(2014AB025) （2014AB025）
陕西省教育科研自然科学重点项目(2015JS060) （2015JS060）
