摘要
采用分析岩石损伤破裂过程的RFPA2D-Flow数值计算软件,研究了大阳煤矿3401综放面煤壁前方煤层水力致裂对采场矿压的应力扰动过程。结果表明:随着水压力的增大,围岩应力会不断经历集中、转移、再集中的过程,受水力致裂的影响顶板压力释放,高应力值不再出现,低应力值出现得较为密集,弱化了顶板(煤),围岩被湿润弱化,湿润弱化范围逐渐向四周扩展。现场试验验证了煤层水力致裂对卸除覆岩高应力、弱化坚硬顶板和提高放顶煤采出率的积极作用。
The stress disturbing processes of face rock pressures,which were induced in coal seam by hydraulic fracturing at the front of fully mechanized sublevel caving face 3401 in Daiyang Coalmine,were studied by means of the numerical simulation software RFPA2D-Flow.The results showed that with the increase of water pressure,the stress in surrounding rock experienced continuously the processes of the concentration,transfer and re-concentration;the roof pressure was released by the effect of hydraulic fracturing of coal seam;there was no occurrence of the high stress,but low stress appeared more often;the roof(or coal) was wetted and weakened and the range of roof weakening gradually expanded to all around.The test of face practice verified that the hydraulic fracturing of coal seams played a positive role in removing high overburden stress,weakening the strong roof and raising the recovery rate of caved top coal.
出处
《山东科技大学学报（自然科学版）》
CAS
2012年第3期59-65,共7页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家重点基础研究发展计划("973"计划)项目(2011CB201203)
国家科技重大专项(2011ZX05041-003)
国家自然科学基金项目(50904034)
关键词
煤层水力致裂
采场矿压
应力扰动
弱化顶板
hydraulic fracturing of coal seam
rock pressure in working face
stress disturbance
roof weakening
