厚松散层黄土丘陵地貌开采沉陷规律实测研究

Study on Mining Subsidence Law of Thick Loose Layer in Loess Hilly Landform

厚松散层黄土丘陵地质条件下开采造成的地表沉陷既具有沉陷的一般规律,同时也有其独特的特性。以此典型地质条件下的柳湾矿61115工作面实测资料为基础,获得了工作面开采后的地表移动变形动静态规律。结果表明:活跃期下沉量占总下沉量的97%,最大下沉速度达50.7 mm/d;地表移动特征表现为下沉集中在活跃期并且下沉速度较大,基岩移动角偏大而综合边界角偏小;同时求取了概率积分法参数,下沉系数达到了0.91,水平移动系数为0.3,下沉系数和水平移动系数偏大,并分析了参数特征及产生机理。为相似地质条件下“三下”采煤及保护煤柱的留设提供参考。

Under the geological condition of thick loose layer of loess hills,the surface subsidence caused by mining not only has the general law of subsidence,but also has its unique characteristics.Based on the measured data of the 61115 working face in Liuwan Mine,the dynamic and static laws of surface movement and deformation were obtained.The results show that the subsidence in the active period accounted for 97%of the total subsidence with the maximum subsidence velocity of 50.7 mm/d;the surface movement was characteristic of subsidence concentration in the active period,high subsidence speed,large bedrock movement angle,and small comprehensive boundary angle;through probability integral method,the sinking coefficient and horizontal movement coefficient were larger,0.91 and 0.3 respectively.In addition,the characteristics and mechanism of the parameters were analyzed to provide references for the coal mining“underbuildings,railways,and water-bodies”and for the protective coal pillars under similar geological conditions.