柠条塔矿不同深度覆岩波速特性及其物理参数相关性研究  

Wave velocity characteristics and its correlation with physical parameters of overlying strata at different depths in Ningtiaota mine

作　　者：左建平[1,2] 左书豪 孙运江[1] 史月[1] 米长宁 李政岱 ZUO Jianping;ZUO Shuhao;SUN Yunjiang;SHI Yue;MI Changning;LI Zhengdai(School of Mechanics&Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology-Beijing,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《采矿与安全工程学报》2021年第4期791-799,共9页Journal of Mining & Safety Engineering

基　　金：北京市卓越青年科学家项目(BJJWZYJH01201911413037);陕煤陕北矿业公司重点项目(2018SMHKJ-A-J-03);国家自然科学基金项目(51622404,41877257)。

摘　　要：为了分析陕北矿区岩层内天然孔隙-裂隙及其对地下水流场分布的影响,本文采用超声波无损检测技术对陕北柠条塔矿2^(-2)煤覆岩进行波速测试,以反映陕北矿区覆岩天然孔隙-裂隙发育情况,得出岩层垂直方向(轴向)纵波波速V_(PA)和水平方向(环向)纵波波速V_(PC)随埋深H和密度ρ的变化规律,发现岩层埋深H与轴向纵波波速V_(PA)呈近似线性正相关,密度ρ与环向纵波波速V_(PC)呈非线性正相关,纵波波速V_(P)的变化能反映密度ρ的波动情况。利用系统聚类法分析纵波波速V_(P)、埋深H和密度ρ的相关性,得出了覆岩聚类系谱图和覆岩参数间的经验公式。通过岩层细观试验发现岩石颗粒属性对覆岩参数间关联性具有重要影响。In order to analyze natural pores and fissures in the strata of northern Shaanxi mining area and their influence on the distribution of groundwater flow field,the wave velocity of overlying strata of 2^(-2) coal seam in Ningtiaota mine of northern Shaanxi was tested with the ultrasonic nondestructive testing technology so as to reflect the development of natural pores and fissures in the overlying strata.The rule of vertical(axial)P-wave velocity V_(PA) and horizontal(circumferential)P-wave velocity V_(PC) of rock strata changing with the variation of buried depth H and densityρwas obtained.It has been found that the buried depth H has an approximately linear positive correlation with the axial P-wave velocity V_(PA),and the densityρhas a nonlinear positive correlation with P-wave velocity V_(PA),the variation of P-wave velocity V_(P) can reflect the fluctuation of the densityρ.The empirical formula between the cluster pedigree diagram of overlying strata and overlying strata parameters was obtained through analyzing the correlation of P-wave velocity V_(P),buried depth H and densityρwith systematic clustering method.It has been found through mesoscopic experiment of coal seams that the properties of rock particles have an important influence on the correlation among overlying strata parameters.

关 键 词：上覆岩层 纵波波速 埋深 密度 聚类分析 

分 类 号：TD313[矿业工程—矿井建设]