New method to predict the height of fractured water-conducting zone by location of key strata
New method to predict the height of fractured water-conducting zone by location of key strata
复制标题
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Wang Xiao-zhen
中科院分区：
文献类型：
--
作者：
Wang Xiao-zhen
在深入研究关键层对顶板裂隙导水带高度影响规律的基础上，提出了一种利用关键层位置预测顶板裂隙导水带高度的新方法，工程实测和理论研究结果表明，关键层位置影响顶板裂隙导水带高度，当关键层距煤层的距离小于某一临界值时，关键层裂隙将向导水裂隙发展，上覆岩层受关键层控制破裂，与关键层同步破裂，关键层临界高度裂隙可粗略估计为（7~10）M，其中M为煤层采高，当主关键层距煤层小于（7~10）M时，导水裂隙将发育到基岩顶板以上位置，那么裂隙水的高度当主关键层距煤层的距离大于（7~10）M时，顶板导水裂隙将发育到距煤层（7~10）M以上的最近关键层以下，此时裂隙导水带高度等于关键层距煤层的距离。该预测方法能够预测不同采高下顶板裂隙导水带高度，同时，也可用于判别关键层结构变化引起的裂隙导水带高度异常发育，工程实测结果验证了其可靠性。
Based on depth study of the influence law of key strata on the height of fractured water-conducting zone,this paper proposed a new method to predict the height of fractured water-conducting zone by location of key strata.The engineering measurements and theoretical research results show that the key stratum location affects the height of fractured water-conducting zone in the roof,when the distance from key stratum to the coal seam is less than a critical value,the fracture of key stratum will develop to water-conducting fracture,and the same goes to the fracture of the overlying strata controlled by key stratum leading to a synchronous breakage with key stratum.The critical height of key stratum fracture can be roughly estimated to be(7～10)M,where M is coal mining height.When it is less than(7～10)M from the primary key stratum to coal seam,water-conducting fracture will grow to the location above the roof of the bed rock,then the height of fractured water-conducting zone is equal to or greater than the height of the bed rock.When the distance from the primary key stratum to coal seam is greater than(7～10)M,water-conducting fracture in the roof will develop to the position below the nearest key stratum being(7～10)M more away from the coal seam,and then the height of fractured water-conducting zone equals to the distance of the key stratum to coal seam.The prediction method is able to predict the height of fractured water-conducting zone in the roof with different mining heights,meanwhile,it also can be utilized to distinguish the abnormal development of the height of fractured water-conducting zone induced by structural changes of key stratum,and its reliability is verified by engineering measurements results.