摘要
为了得到条带地下气化开采覆岩移动下沉规律,以华亭煤炭地下气化为例,在气化过程傅里叶传热分析的基础上,建立含温度场的多层热弹性基础梁模型,分析温度场的存在对岩梁挠度的直接和间接影响,通过引入煤层烧变损伤因子并确定损伤范围,最后求得含损伤弹性基础的热弹性基础梁挠度解析解,并理论分析岩梁挠度、弯矩、剪力和载荷随时间的变化规律。结果表明:温度场的存在使岩梁在垂直方向和水平方向分别产生附加弯矩和热应力,其随时间在直接顶内呈先增大后减小,在老顶内呈一直增大趋势;岩梁挠度、弯矩、剪力和载荷基本都大于常温状态下的数值,且随覆岩热传导时间基本呈先增大后减小趋势。通过与现场实测下沉曲线的对比,说明该模型是合理的和符合实际的。
In order to obtain the movement and subsidence of overlying strata under stripe mining with underground coal gasification（UCG）, a multi-layer elastic foundation beam model with temperature field for Huating coal mine was established. The direct and indirect influence of the temperature field on rock beam deflection was theoretically analyzed based on Fourier analysis of overlying strata during gasification process. The analytical solution of rock beam deflection with the damaged elastic foundation was obtained by introducing the coal burnt damage factor and determining the damaged ranges. The deflection, bending moment, shear force and transient loading of rock beam were theoretically analyzed. The temperature field was found to form the additional bending moment and thermal stress in rock beam in vertical direction and horizontal direction respectively, which increased first and then decreased with time in the immediate roof while increased continuously in the main roof during the gasification process. The deflection, bending moment, shear force and load of the rock beam were larger than that at normal temperature, and the values increased first and then decreased with time. The model was proved to be reasonable by comparing with the field measured subsidence curve.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第6期1233-1244,共12页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51504142
51574158)
青岛市博士后研究人员应用研究资助项目(2015204)~~
关键词
采矿工程
煤炭地下气化
热弹性基础梁
挠度
覆岩移动
mining engineering
underground coal gasification（UCG）
thermo-elastic foundation beam
deflection
rock movement
