重复采动条件下房屋裂缝规律的分析

基于现场实测获得的房屋裂缝和地表水平变形资料，分别分析了初次采动和重复采动条件下房屋裂缝的发育规律，分析了重复采动条件下房屋裂缝发育规律的特殊问题。获得了采运过程中房屋裂缝宽度与地表水平变形之间的关系曲线。在村下采煤过程中，井下工作面若保持匀速推进，就可以保证房屋承受匀速、渐变的拉伸、压缩变形过程，使房屋的残余变形很小，反之，房屋破坏程度就比较严重。由于房屋极易从已有裂缝处开裂，形成更大的裂缝，因此，重复采动前，应对已有损坏的房屋进行适当的维修。

Analysis About The Rules of Buildings Fissure During Repeat Mining

Based on the field data of building fissure and surface horizontal deformation, the author analyzes the building fissure's developing rules during first mining and repeat mining separately, studies the special problem of building fissure's developing rules during repeat mining. From the analysis above, the typical curve between the building fissure's width and surface horizontal deformation during mining is acquired. During mining under the village, if the workface given keeps the same speed, it can ensure the building sustains gradation stretch and compression strain with equality speed, so the residue deformation of building is very small. Conversely, the damage of buildings will be very large. Because the building fissure is liable to occur and develop at spot where the fissure has been already exist, so it is important to maintain the damaged building before repeat mining.