摘要
运用自主研发的"含瓦斯煤热流固耦合三轴伺服渗流实验装置",进行了恒定瓦斯压力和围压条件下,不同原始含水率含瓦斯煤样全应力-应变瓦斯渗流试验,结合现场实测煤层注水前后瓦斯涌出量的变化规律。研究结果表明:随着煤样原始含水率的增加,煤样的三轴抗压强度减小,弹性模量减小,三轴抗压强度处轴向应变增大、横向应变和体积应变的绝对值增大;在全应力-应变整个过程中,煤样的甲烷有效渗透率都减小。从煤的力学特性和瓦斯在煤层中流动两个方面分析了煤层注水的防突作用。煤层原始含水率越高,发生煤与瓦斯突出的危险性越小。可将煤层的原始含水率作为判断煤与瓦斯突出危险程度的一个重要指标。
By using self-made ＂Coal Containing Gas Thermal-Hydrological Mechanical （THM） Coupling Experimental Equipment＂, an experimental study is carried out to investigate the gas seepage law of containing-gas coal during the complete stress-strain process with different original water contents. Under the conditions of constant gas pressure and confining pressure, and the experimental results are compared with the field test of the gas emission variation of coal seams before and after being infused. The research results show that the triaxial compressive strength and the elastic ratio of coal decrease with the increase of original water content in coal, but the axial strain of coal increases and the absolute value of transverse strain and volume strain of coal increases at the triaxial compressive strength; the methane effective permeability of coal decreases throughout the complete stress-strain process. Outburst prevention by coal seam infusion attributed is analyzed from two aspects： the mechanics of coal and the gas flow in the coal seams. The higher original water content in coal seams is, the smaller the risk of coal and gas outburst becomes. So the original water content in coal seam can be treated as a significant criterion for the judgments of coal and gas outburst criticality.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第1期91-95,共5页
Journal of Chongqing University
基金
国家重点基础研究发展计划(973计划)资助项目(2011CB201203)
国家自然科学基金资助项目(51204217
51374256)
国家科技重大专项资助项目(2011ZX05034-004
2011ZX05040-001-005)
煤矿灾害动力学与控制国家重点实验室自主研究课题(2011DA105287-MS201212)
中央高校基本科研业务费资助项目(CDJZR12240054)
关键词
煤与瓦斯突出
含水率
全应力-应变
渗透率
固-液-气耦合
采矿工程
coal and gas outburst
water content
complete stress-strain
permeability
solid-liquid-gas coupling
mining engineering
