团柏煤矿带压开采条件下11-101工作面合理长度

山西省霍州团柏煤矿11-101工作面为带压开采。为预防回采期间底板突水事故，采用弹塑性理论、现场实测、数值模拟验证相结合的方法，对不同工作面长度条件下底板破坏深度发育规律进行研究，进而确定该条件下开采的工作面合理长度。研究表明，随着工作面推进，滞后工作面6 m左右底板首先发生拉伸破坏，底板破坏呈楔形。工作面长度在60~120 m，破坏深度随着工作面长度增加呈线性增长，平均每增加10 m，破坏深度加深1 m。理论计算与数值模拟计算得出80 m工作面底板破坏深度为7~8 m，现场实测底板破坏深度为7.5 m，故工作面合理开采长度为80 m时，能够确保11-101工作面生产安全。 

Reasonable length of working face 11-101 during mining above confined aquifer in Tuanbai mine

The working face 11-101 of Tuanbai coal mine in Huozhou, Shanxi Province is exploited above aquifer. In order to prevent floor water inrush accidents during mining, research combination of elasto-plastic theory, on-site measurement and numerical simulation was carried out to analyze the development rule of failure depth of the floor, then the reasonable length of the mining face under this condition was determined. The result shows that with the advancement of working face, the bottom plate of lagging working face is stretched and destroyed at about 6 m behind the lagging working face, and the bottom plate has a wedge shape. The length of the working face is in the range of 60 m to 120 m. The damage depth increases linearly with the length of the working face. When the length of the working face increases every 10 m, the damage depth increases by 1 m, and the reasonable mining length of the first mining face is 80 m. Theoretical calculations and numerical simulations show that the floor damage depth of the 80 m working face is 7-8 m. The actual measured failure depth of the floor is 7.5 m. Therefore, when the reasonable mining length of the working face is 80 m, the production safety of the working face 11-101 can be ensured.