Study on the Foundations of Transmission Lines in Mining Area with the Risk of Geological Hazards

Abstract

The influence of mining area on the ‘ground surface' is mainly divided into three categories: the movement and deformation of vertical direction (subsidence, inclination, curvature), the movement and deformation of horizontal direction (horizontal movement, stretching and compression) and the shear deformation of surface plane, which are mainly reflected by discontinuity deformations including surface cracks, collapse pits, subsidence troughs, etc. These kinds of deformation directly act on the iron tower foundation of transmission lines, causing varying degrees of damage on iron tower foundation, such as sink, tilt, displacement, distortion, etc. and thus influence safety of the iron tower and the stable operation of the entire transmission lines. Therefore, this paper reviews the actual situation of the mining area, compares the features of different foundations, and proposes a method of applying the independent big slab foundation. This foundation can resist uneven settlement in a mining depth to thickness ratio of 90 to 150, and adjust anchor bolt to assist for processing surface uneven settlement and deformation. In this way, the risks of geological hazards in the meaning area could be eliminated significantly.