Study on Shandong Coalfield Surface Subsidence Law in the North of Yellow River

In order to study the mining surface ground subsidence law of Shandong coalfield in the north of Yellow River, a surface ground subsidence observation station was established at West No.1 Mining Block of Qiuji Mine of Shandong coalfield in the north of Yellow River. According to the related regulations, the observations were conducted.In combination with the surface ground subsidence laws of other mining areas, the regression analysis method was applied to study the observation dat a obtained.The mining subsidence features of Shandong coalfield in the north of Yellow River was analyzed. The surface ground subsidence of Shandong Coalfield in th e north of Yellow River could meet the probability integration. The parameters obtained were individually 0.86 of the subsidence coefficient.The main influence angle tan gent was 1.55, the influence propagation angle was 89°，the yielding point moving distance was 0.The surface ground subsidence features of the ultra thick soft layer w ould be large in the subsidence coefficient and small in the main influences angle tangent.