中文摘要：

为了研究＂三软＂薄煤层群沿空留巷条件下区段开采顺序对回采巷道的影响,在结合前期现场调查分析、支护研究、室内岩石物理力学参数测定的基础上,利用有限差分法对四川南部地区某煤矿的极近距离＂三软＂薄煤层群区段下行式或上行式开采顺序进行了数值模拟。研究表明,采用区段下行式开采顺序时,巷道顶板及高帮上侧顶板易发生挤压、剪切破坏,高帮充填带稳定性相对较差,而上行式开采较下行式开采的垂直应力在巷道矮帮0.5 m范围内至少减小1 MPa,剪应力减小1 MPa,产生的水平应力能阻止矮帮充填带向采空区侧滑移,也有利于提高充填带的初期强度。

英文摘要：

In this paper,to investigate the influence of different mining sequence of sublevels on gate-ways in conditions of gob-side entry retaining in three-soft thin coal seam group,we carried out nu-merical simulation study on the upward and downward mining sequences of sublevels respectively in the three-soft thin coal seam group with ultra-close distance in one coal mine of Southern Sichuan,based on the previous field investigation and analysis,shield supporting study and experimental deter-mination of rock mechanics parameters.The results show that extrusion and shear failures are occurred easily in the roadway roof and roof of higher side when the downward mining sequence of sublevels is used,and the rock packing of higher side has poor stability,while the vertical stress and shear stress of lower side in the range of 0.5m decrease 1 MPa at least during upward mining,compared with the for-mer mining sequence,and the produced horizontal stress can prevent the rock packing of lower side slip towards the gob side,which is beneficial to increase the initial strength of the rock packing.