采空场覆岩变形数值模拟与相似模拟比较研究  

Comparative study on numerical simulation and similarity simulation of overburden deformation in abandoned stope

作　　者：李向阳[1] 李俊平[1] 周创兵[1] 向文飞[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《岩土力学》2005年第12期1907-1912,共6页Rock and Soil Mechanics

摘　　要：用有限元数值计算尝试了离层模拟,并分别采用数值模拟与相似模拟的方法研究了木架山矿区143剖面倾斜采空场处理时的地表移动与覆岩破坏规律。研究发现,随着矿柱的崩落,覆岩跨度不断增加,引起的地表移动范围也不断增大,地表垂直沉降范围大致为跨度的1.5～1.7倍,垂直沉降曲线始终对称于最大沉降点;水平移动的范围大于垂直沉降的范围,最大水平移动量大约为最大沉降量的40%,且水平移动不对称。另外,当覆岩发生整体下沉时离层主要存在于跨度两端,离层由层理剪切破坏引起。An attempt is made to simulate the layer separation in overburden by using the finite element numerical modeling; and the numerical modeling together with similarity simulation is adopted to investigate the surface movement and the breakage of the overburden during the abandoned stope treatment of the section #143 in Mujia Hill. It has been found from this research that the range of surface movement increases moderately with the collapse of jambs and the increase of the roof span. The subsidence area ranges from 1.5 times to 1.7 times of the roof span and the subsidence curves are symmetrical to the vertical line through the point with maximum subsidence. The horizontal movement, however, is not symmetrical and its impacting area is larger than the range of subsidence, with its maximum value equal to 40 % of the maximum subsidence. In addition, the layer separation exists in the end of span of overburden if the subsidence happens in whole overburden, which is resulted from the shear failure of the bedding plane.

关 键 词：数值模拟 相似模拟 地表移动 覆岩离层 

分 类 号：TD325[矿业工程—矿井建设]