急倾斜煤层走向综采覆岩破坏特性研究  

Study on Characteristics of Rock-strata Fracture of Fully Mechanized Mining in Steep Inclined Coal Seam

作　　者：姚琦 冯涛[2] 廖泽[2] Yao Qi;Feng Tao;Liao Ze(School of Civil Engineering,Hunan City University,Yiyang 413000,China;Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mimes,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]湖南科技大学煤矿安全开采技术湖南省重点实验室,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2019年第4期8-16,共9页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：国家自然科学基金资助项目(51274095);煤矿安全开采技术湖南省重点实验室开放基金资助项目(201402)

摘　　要：为研究急倾斜煤层走向综采覆岩变形及破坏规律,采用力学分析、相似模拟实验及数值模拟分析,得到工作面覆岩破坏特性及岩层移动规律.研究表明:(1)急倾斜煤层综采面推进后,顶板位于工作面中部偏上覆岩处的岩层出现了挠度最大值,导致顶板断裂呈现由工作面顶板岩层的"中上部-上部-中下部-下部"的垮落顺序.(2)工作面上部覆岩以产生拉伸破坏为主,中、下部覆岩以剪切破坏为主;直接顶冒落的矸石充填下部近1/3的采空区域,且上部出现垮落区域比下部范围明显更大.(3)工作面下部应力集中系数比上部大1.2倍左右,工作面的下部端头支护处在极不均匀的高应力集中区,工作面端头及超前支护相当困难.To study the overlying strata deformation and failure of steep seam when using fully mechanized mining alone the strike,the failure characteristics and movement of overlying strata was studied by mechanical analysis,simulated experiment with analogy material and numerical simulation analysis. And the results show that,( 1) the maximum deflection appeared on the position about middle-upper part,the caving sequence of roof is middle-upper part,upper part,lower-middle part and bottom.( 2) after mining alone the strike,the overlying strata failure is mainly tensile fracture,the failure of middle and bottom of working face overlying strata is mainly shear failure. The one third lower gob area filled by gangue which is caved from immediate roof,and the upper cave zone is obvious bigger than lower cave zone. The caving shape is upturned bear bottle in the direction of dip.( 3) the stress concentration factor at the lower part of the working face is about 1.2 times larger than that of the upper part. The lower end support of the working face is in a highly uneven high stress concentration area,and the working face end and advanced support are quite difficult.

关 键 词：急倾斜煤层 综采 岩层移动 相似模拟 数值分析 

分 类 号：TD323[矿业工程—矿井建设]