It is difficult to maintenance the wire communication device in the pit because the ground is wet, cable corrosion is serious and sign al is bad.
由于煤矿井下地面潮湿，电缆腐蚀严重，信号不好，有线通信装置维护困难。
2
This paper presents an engineering example for the application of pre-stressing cable in supporting excavated slope in the west open-pit of the Pingzhuang coalmine.