摘要
为分析承压水上采煤底板变形破坏规律,建立了承压水上采煤流固耦合数学模型,采用FLAC3D模拟软件分析之。运用正交试验的方式对底板变形破坏影响较大、易量化的4个因素进行分析;在此分析基础上得出单一因素对底板破坏的影响关系。分析结果表明:影响底板破坏深度大小的因素依次是工作面宽度、隔水层厚度、承压水压力和煤层埋深;随着隔水层厚度的增加,底板的破裂深度及范围有减小的趋势,同时在隔水层底部的原位张裂范围也在减小,甚至消失;在流固耦合模式下随着水压力的增加,岩体的破坏程度远远大于非耦合的情况。
In order to analyze deformation and damage characteristics of coal seam floor during mining above confined aquifer,fluid-solid coupling mathematic algorithm of mining above confined aquifer was established and mining seepage mechanism of coal seam floor was simulated by FLAC3D.Orthogonal tests were done with 4 major factors which have big influence on floor damage and are easy to be quantified.On the basis influence of single factor on floor damage was obtained.The results showed that according to effecting degree on floor damage depth the factors in turn are working face width,thickness of impermeable layer,confined water pressure,and depth of coal seam occurrence.With the increase of impermeable layer thickness,floor damage depth and scope tend to decrease,while the range of destruction in situ tension crack under the impermeable layer also reduces or even disappears.In fluid-solid coupling mode,with the increase of water pressure,rock mass damage is far greater than non-coupled situation.
出处
《安徽理工大学学报（自然科学版）》
CAS
2010年第4期5-10,共6页
Journal of Anhui University of Science and Technology:Natural Science
基金
2009年安徽省煤炭安全生产重大专项资金资助项目(皖财企[2009]1868号)
关键词
流固耦合
正交试验
底板破坏
fluid-solid coupling
orthogonal test
floor damage
