复杂条件下上提蹬空工作面矿压显现特征研究

Study on Characteristics of Strata Press Appearing under Complex Conditions with Working Face over Goaf

为了解决蹬空对巷道围岩变形影响严重等问题,针对张集矿1410(1)工作面复杂的地质条件,采用计算机数值模拟(UEDC)系统和现场工程实践相结合的方法,对工作面推进不同距离时上覆岩层垮落形态、初次来压步距、周期来压步距、液压支架受力以及巷道围岩的变形特征进行研究。研究表明:工作面老顶初次来压步距约为32 m左右,周期来压步距约为16 m左右。工作面液压支架所需支撑的最大岩层高度约为25m。在工作面每天正常推进8m的情况下,工作面压架的危险性较小。

In order to solve the problem of serious impact of working face over goaf on the surrounding rock deformation and other issues,under complex geological conditions of 1410（1） working face in Zhangji Coal Mine,by use of computer numerical simulation system（UEDC） and on-site engineering practice,at different distance of the working face advancement overburden caving form,the initial weighting step,circular press step,force on hydraulic support,as well as the surrounding rock deformation characteristics were studied.The study shows that： the first weighting step in the basic roof is about 32 m,the circular press step is about 16 m.The rock height required to be supported by hydraulic props is about 25 m.The risk of props blocked is minimum,when working face advances 8 m per day.