采空区对输电线路塔基影响的安全评价及应急处理

针对贵州六盘水市煤层采空区上产生垂直方向的下沉、倾斜、曲率变形和水平方向的水平移动、拉伸与压缩变形,导致输电线路塔基基础发生不同程度的移动和变形的情况.结合贵州六盘水市煤层采空区输电线路地质灾害状况,搜集了有关矿区地质、采矿等资料,应用概率积分法预计采空区及输电线路杆塔地基地表移动和变形的最值,定性评价塔基最终稳定程度,并对输电线路的运行安全性作出评价,得出,典型煤矿区上的水滥线056塔、盘红011塔,普滥Ⅰ回线187塔、188塔均处于潜在不稳定和运营不安全状态,从而提出了带电扶正铁塔、基础带电复位、基础加固和改线四条措施,对输电线路的设计、排除危险塔基安全隐患、保证输电线路的安全、正常运营有重要意义.

Safety evaluation on tower foundation of transmission lines within coal mine goaf and its emergency treatment

In leads the tower foundation of transmission lines to move and deform in various degrees that the surface deformation at the mine out area shows sinking,tilt and curvature in vertical direction and horizontal movement,stretching and compression deformation in horizontal direction in Liupanshui city,Guizhou Province.Aiming at this situation,based on the geological disasters within the mine out area along the transmission lines,geological and mining information,this paper estimates the extreme values of foundation surface movement and deformation of transmission lines at the mined-out area,and qualitatively evaluates the ultimate stability of tower base and the safety of the transmission lines using probability integral method.The conclution is that the Tower 056 ShuiCheng-LanBa,Tower 011 PanXan-Hongguo,Tower 187 and 188 PuDing-LanBa in the typical coal mine area have been in a potentially unstable and insecurity state.It plays an important role in designing transmission lines,eliminating of the risk in tower foundation,and ensuring the safety of transmission line and its normal operation that the paper proposed four measures as follow:upending towers without blackout,resetting the tower foundation by letting the transmission lines live,reinforcing the foundation or changing the route of the transmission lines.