大采高工作面冒落带动态分布特征及确定方法
发布时间：2019-04-22 14:54
【摘要】：根据大采高工作面采空体积大及其矿压活动特点,将工作面覆岩分为直接顶内有结构岩层和无结构岩层两类,考虑采空区冒落矸石自重压缩和结构岩层失稳向采空区施加荷载,建立了两类结构不同开采阶段冒落带动态分布方程,揭示了采空区冒落带动态分布特征。结果表明:大采高工作面覆岩采空区冒落带呈明显的动态变化特征;冒落带高度变化与覆岩结构岩层厚度、容重、工作面开采时间、冒落矸石初始碎胀系数及压缩模量相关;基本顶砌体梁结构破断前冒落带在短时间内急剧增大,并达到极值,该阶段冒落带矸石自重压缩增加了采空高度使冒落带进一步增加;基本顶砌体梁结构回转载荷和直接顶内结构岩层滑落失稳施加的动荷载,对采空区矸石压缩作用受岩层厚度、容重及持续时间决定;整体下沉阶段冒落带高度随开采时间的增加而缓慢下降,一定时间后趋于稳定。
[Abstract]:According to the large volume of goaf and the characteristics of rock pressure activity in high mining face, the overburden rock of working face is divided into two types: structural rock layer and unstructured rock stratum in direct roof. Considering the self-weight compression of caving gangue in goaf and the instability of structural rock stratum, the overburden is applied to the goaf. The dynamic distribution equations of caving zone in different mining stages with two kinds of structures are established, and the dynamic distribution characteristics of caving zone in goaf are revealed. The results show that the caving zone of overlying rock goaf in large mining height face is characterized by obvious dynamic change, and the height change of caving zone is related to the thickness of overlying rock strata, bulk density, mining time, initial crushing expansion coefficient and compression modulus of gangue. The caving zone of the basic roof beam structure increases rapidly in a short period of time and reaches the extreme value. At this stage, the self-weight compression of the gangue in the caving zone increases the height of the goaf and further increases the caving zone. The rotation load of the basic roof beam structure and the dynamic load imposed by the sliding instability of the rock strata in the direct roof are determined by the thickness, bulk density and duration of the rock strata in the goaf under the compression action of the gangue. The height of the falling zone decreases slowly with the increase of mining time in the whole subsidence stage and tends to be stable after a certain period of time.
【作者单位】： 北京科技大学土木与资源工程学院;河北工程大学矿业与测绘工程学院;河北省煤炭资源综合开发与利用协同创新中心;内蒙古伊泰广联煤化有限责任公司;
【基金】：国家重点研发计划(2016YFC0600801) 国家自然科学基金重点资助项目(51534002)
【分类号】：TD325
本文编号：2462930
[Abstract]:According to the large volume of goaf and the characteristics of rock pressure activity in high mining face, the overburden rock of working face is divided into two types: structural rock layer and unstructured rock stratum in direct roof. Considering the self-weight compression of caving gangue in goaf and the instability of structural rock stratum, the overburden is applied to the goaf. The dynamic distribution equations of caving zone in different mining stages with two kinds of structures are established, and the dynamic distribution characteristics of caving zone in goaf are revealed. The results show that the caving zone of overlying rock goaf in large mining height face is characterized by obvious dynamic change, and the height change of caving zone is related to the thickness of overlying rock strata, bulk density, mining time, initial crushing expansion coefficient and compression modulus of gangue. The caving zone of the basic roof beam structure increases rapidly in a short period of time and reaches the extreme value. At this stage, the self-weight compression of the gangue in the caving zone increases the height of the goaf and further increases the caving zone. The rotation load of the basic roof beam structure and the dynamic load imposed by the sliding instability of the rock strata in the direct roof are determined by the thickness, bulk density and duration of the rock strata in the goaf under the compression action of the gangue. The height of the falling zone decreases slowly with the increase of mining time in the whole subsidence stage and tends to be stable after a certain period of time.
【作者单位】： 北京科技大学土木与资源工程学院;河北工程大学矿业与测绘工程学院;河北省煤炭资源综合开发与利用协同创新中心;内蒙古伊泰广联煤化有限责任公司;
【基金】：国家重点研发计划(2016YFC0600801) 国家自然科学基金重点资助项目(51534002)
【分类号】：TD325
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