神东矿区岩石物理力学性质变化规律研究

Change rule of physical and mechanical property of rock mass in Shendong mine

通过对神东矿区3个典型大采高工作面钻孔柱状岩石物理力学性质与沉积时期和埋深关系的研究,得到如下结论:1)埋深相同的同类岩性岩石的物理力学性质与沉积时期有着密切联系,同矿区不同矿井同一岩性即使在同一埋深条件下,其岩石物理力学性质也有很大的不同,沉积时期早的岩石物理力学性质大于沉积时期晚的岩石;2)同类岩性岩石的物理力学参数总体上随着埋深的增加而增加,且大多数岩石的物理力学性质与埋深具有较好的线性关系;3)同一矿井的砂岩类抗压强度和抗拉强度与颗粒粒径成反比,且泥岩类的抗压强度和抗拉强度普遍比粗砂岩和含砾粗砂岩高。

Through the research on the relationship between physical and mechanics parameters of rocks and sedimentary period and burial depth in three typical high face mining in Shendong mining area,the following conclusions can be obtained:1)Physical and mechanics parameters of congeneric rocks at the same depth is closely connected with the sedimentary period.There are still radical differences in the physical and mechanics parameters of the rocks among the different mine,even they are with the same lithology at the same depth and in the same mine areas.The physical and mechanics parameters of rocks at earlier sedimentary period is greater than the ones at later sedimentary period.2)The physical and mechanics parameters of congeneric rocks increase with the burial depth and are mostly linear with burial depth.3)The tensile and compressive strengths of sandstone in a same mine are inversely proportional to particle diameter.And the tensile strength of mudstone is bigger than the one of coarse sandstone and conglomeratic sandstone.