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为掌握近距离煤层层间基本顶的损伤及破断规律,采用连续损伤模型对上煤层开采引起的底板损伤规律进行了研究,并依据层间基本顶在采空区损伤区域的层位对基本顶进行了分类,获得了损伤基本顶初次断裂长度计算公式。结果表明:底板损伤区域呈勺形分布,损伤量由损伤核区域向边缘区域递减;层间基本顶可分为无损伤、部分损伤以及完全损伤3类,3类基本顶对下煤层矿压显现的影响依次减弱;损伤基本顶的断裂长度随损伤量的增大而减小,存在极限损伤量,使得损伤基本顶的断裂长度趋近于0;损伤基本顶断裂形成的关键块高长比增大,砌体梁结构更易发生滑落失稳,其情况与斜沟煤矿现场矿压观测结果吻合。
In order to grasp the damage and rupture law of the basic roof at short distance, continuous damage model was used to study the law of floor damage caused by upper coal seam mining. According to the basic top of the bed, After classification, the calculation formula of the initial rupture length of the damaged basic roof was obtained. The results show that the damage area of the floor is in a spoon-shaped distribution, and the damage amount decreases from the damaged nuclear area to the marginal area. The basic roof can be divided into 3 types and 3 types of basic damages, The damage length of the basic roof decreases with the increase of the damage amount, and the limit damage amount exists, so that the rupture length of the damaged basic roof approaches 0; the key block length of the damaged basic roof rupture increases by Large, masonry beam structure is more prone to slip instability, its situation and oblique gully mine site pressure observation results.