School of Geology and Environment,Xifan University of Science and Technology Xi'an Research Institute,China Coal Technology and Engineering Group

为得到离柳矿区柳家庄煤矿8号煤层首采工作面底板破坏发育特征,采用数值模拟及现场实测相结合的方法,研究了80101首采工作面底板破坏裂隙的发育形态及深度、不同工作面宽度条件下的底板破坏深度发育特征;根据压水判别依据,确定了5组底板破坏探测孔裂隙发育深度的实测数据。数值模拟结果表明:未受相邻采场采动应力影响下的首采工作面底板破坏深度发育较小,底板破坏在工作面走向上呈倒马鞍形,即工作面端部两侧底板破坏深度最大,最大破坏带向外侧倾斜为剪切破坏为主;工作面中部底板破坏深度小,以拉张破坏为主;底板破坏深度受工作面宽度影响较大,底板采动破坏深度与工作面宽度呈线性变化。现场实测结果表明,柳家庄煤矿80101首采工作面底板破坏深度为16.32~16.92 m,验证了数值模拟的有效性,同时为离柳矿区下组煤带压开采提供了基础资料。

in order to have the foo failure develogment features of the first coal mining face in No. 8 seam of Lijiazhuang Mine in Litu Mining Area,the numercalsinulation and the ste measurement combined metod was appied to study the developmen status and depthof the foo falure and cracks in No.80101 frst coal mining face and the foo falre depth develogment features undear th different mining with.Accoding to the distinguishing basis of the pressurized water,there were fivegroups ofthe sie meaured data of the crack development depth from the foo falre delection hole detemined.The numericalsnmulation results showed that withoutany infuences of the mining stress rom the neighboring minin face. the foor failre depth development of he frst coal minin face was small nd the foor falure wasin a reversed saddle shape along the face strikce. Thatis to say that at the face ends.the failure depth of the two side foors was max and the cutward in'ination of themax failure zone was mainl in a shearing falure Thefalire depthat the midtle of the coal mining face was small and was mainly i a tensile falre. The falure depthof the foor was highly affected by the with of the coal mining face and the mining falture depth ofthe foor and the wiath ofthe coal mining face were varied i a lneatThe site measured result showed that the foorfalre depth of No.80101 frst coal mining fae in Liujazhuang Mine was 16.32~16.2 m and thevalidt f he umeical simulation was approved and the basic information would be provided to the pressurized mining in the lower group seam in liliu Mining Area.

国家自然科学基金资助项目(41272388)；西安科技大学培育基金资助项目(201607)；