Observational studies on rules of surface movement under extremely-thick cretaceous sandstone

摘要：

　　For the special conditions of thick loess layer and thick sandstone from Luohe formation in the upper part of overburden above the coal mining area in Binchang mining area, Shaanxi province, surface movement observation was carried out in Tingnan coal mine.By analyzing observation data, it shows that sandstone of Luohe formation controls the surface movement and deformation.Under the condition of super-subcritical extraction,surface movement is small, subsidence ratio is only 0.046, surface deformation is weak and it will not cause damage to surface buildings and facilities.Under the condition close to critical extraction, surface movement increase largely, surface deformation is significant and subsidence ratio reaches 0.22 but far from the maximum subsidence.Subcritical subsidence range is consistent with critical subsidence.Loess layer critical angle depends on its thickness and slope.

关键词： Binchang mining area Subcritical extraction Angle parameters Sandstone of Luohe formation

作者: Xueyi Yu Junjie Liu Wenbin Guo Wenqiang Xu

作者单位: Key Laboratory of Western Mine and Hazard Prevention,Ministry of Education, School of Energy Engineering,Xian University of Science and Technology, Xian710054, China

会议类型: 国际会议

会议名称: 2015 International Academic Forum for Mine Surveying in China(2015中国国际矿山测量学术论坛)

会议地点: 北京

会议语种:英文

页码: 92-97

在线出版日期: 2015-10-16（万方平台首次上网日期，不代表论文的发表时间）