近距离煤层层间基本顶损伤及破断规律研究

发布时间：2018-11-24 17:00

【摘要】：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。
[Abstract]:In order to master the damage and breaking law of the basic roof in the near distance coal seam, the damage law of the floor caused by the mining of the upper coal seam is studied by using the continuous damage model. The basic roof is classified according to the interval of the basic top in the damaged area of goaf, and the formula for calculating the initial fracture length of the basic top of the damage is obtained. The results show that the damage area of the bottom plate is in the shape of a scoop, and the damage amount decreases from the damage nucleus area to the edge area. The interlayer basic roof can be divided into three types: no damage, partial damage and complete damage. The fracture length of the damage base top decreases with the increase of the damage amount, and there is a limit damage amount, which makes the fracture length of the damage base top approaching zero. With the increase of the ratio of height to length of the key blocks formed by the damage basic top fracture, the masonry beam structure is more prone to slip and lose stability, which is in agreement with the observation results of mine pressure in Qiaogou coal mine.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;中国煤炭工业协会咨询中心;
【基金】：2016-11-25基金项目:国家自然科学基金(No.51234005,No.51504259) 中央高校基本科研业务费专项基金(No.2011YZ02)~~
【分类号】：TD322.1

【相似文献】