临近断层综放开采顶板突水数值模拟研究  

Numerical Simulation of Roof Water Inrush in Fully Mechanized Top-Coal Caving near Fault

作　　者：林东才[1] 栾恒杰[1] 王冠赵 代猛猛 

机构地区：[1]山东科技大学矿业与安全工程学院,山东青岛266590

出　　处：《煤炭工程》2015年第2期86-88,共3页Coal Engineering

摘　　要：为解决义桥煤矿2304工作面临近断层综放开采顶板导水裂隙带高度增加、分布范围扩大可能导致突水事故的问题,在分析突水水源、突水通道以及断层导水机理的基础上,结合FLAC3D中的流固耦合模块分析了不同宽度煤柱时围岩应力特征、断层活化情况。结果表明:断层附近煤岩体的垂向应力以及断层的活化都随煤柱宽度的增大而减小;煤柱宽度小于20m时,断层活化所形成的裂隙与采动所形成的上覆岩层导水裂隙带沟通形成导水通道;采动对断层上盘岩层的影响范围随煤柱宽度的增加而减小的趋势不明显,考虑煤炭采出率可适当减小煤柱宽度。2304工作面开采时留设20m的断层防水煤柱,在避免了发生矿井突水事故的前提下减小了煤柱宽度,提高了煤炭采出率。Aiming at the growing height and expanding distribution range of roof water fractured zone, caused by fully mechanized top - coal caving near fault in Yiqiao coal mine 2304 face, which indicated potential water inrush risk, and based on the analysis on water inrush source, passageway and water conducting mechanism of fault, the stress characteristics of surrounding rock and fault activation were analyzed with coal pillars of different width, applying coupled fluid - solid module of FLAC3D. The results show that, vertical stress on coal and rock mass and fault activation degree decrease as coal pillar width increases. Water conducting passageway forms with coal pillar width less than 20m, as the fault activation - induced fractures and water conducting fissure zone links up with each other. And as the decline tendency of mining - induced influence range in upper wall strata is not obvious when coal pillar width decreases, the coal pillar width can be reasonably reduced, to enhance the extraction rate. A 20m coal pillar for fault waterproof was set in 2304 working face, avoiding water inrush with smaller coal pillars.

关 键 词：综放开采 导水裂隙带 断层活化 顶板突水 

分 类 号：TD823.2[矿业工程—煤矿开采]