煤层开采地表移动过程的FLAC3D模拟研究

为减少现场布置大量测点来观测煤层开采地表移动全过程,采用FLAC3D软件模拟分析了煤层地下开采引起的地表移动过程,认为采用沿煤层走向方向每开挖2 m长度计算50步的方式可实现煤层的走向长壁开采,并对某一煤层进行了模拟开采,在模型的上表面经过开采中心点沿走向和倾向剖面线上共布置了36个下沉量和位移速度测点;得出主断面最大下沉量为94 mm,各监测点下沉量及位移速度与计算步数之间的关系曲线符合改进的地表移动Knothe时间函数曲线。

Study on FLAC^3D Simulation of Surface Ground Movement Process for Underground Seam Mining

In order to reduce large number of the measuring points in the site layout to observe the full process of the surface ground movement above the underground seam mining,the FLAC3D software was applied to simulate and analyze the surface ground movement process caused by the seam mining in underground mine.The paper held that the 50 steps method of the length calculation per 2 m excavation along the seam strike orientation could realize the longwall strike mining of the seam.A simulation mining was conducted on a seam.There were 36 measuring points of the subsidence value and displacement speed set on the top surface of the model through the mining center along the strike and inclined cross section line.The max subsidence value of the main cross section was 94 mm as obtained.The relationship curve between the subsidence value and displacement of each monitoring and measuring as well as the displacement and the calculated steps could meet the curve of the surface displacement knothe time function curve to improve.