急倾斜煤层走向长壁工作面底板破坏机理及稳定控制  

Failure mechanism and stable control of floor in long wall mining face along strike with steep coal seam

作　　者：屠洪盛[1,2,3] 刘送永 黄昌文[2] 张晓波 游祖峰 TU Hongsheng;LIU Songyong;HUANG Changwen;ZHANG Xiaobo;YOU Zufeng(School of Mines,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Chongqing Energy,Chongqing Energy Investment Group Science and Technology Co Ltd,Chongqing 401121,China;School of Mechatronic Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116 [2]重庆市能源投资集团科技有限公司重庆能源,重庆401121 [3]中国矿业大学机电工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2022年第2期248-254,共7页Journal of Mining & Safety Engineering

基　　金：国家自然科学基金项目(52004270);中国博士后科学基金面上项目(2019M652020);中国矿业大学煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM18X003)。

摘　　要：随着倾角的增加,急倾斜煤层工作面底板也将发生破坏失稳,针对这一现状,在分析急倾斜煤层底板上端和下端受力特征的基础上,建立了急倾斜工作面底板下端为固支边界条件和上端为简支可滑动约束条件的力学模型,结合底板不同分段微元体受力状态,研究了底板梁柱模型的二元四阶受力变形微分方程,利用基于能量原理的瑞利-里兹法解析了底板梁柱的挠度变形方程,给出了依据最大拉破坏准则的底板最大破坏深度的表达公式,得到了工作面长度与煤层倾角呈非线性反比关系,底板破坏深度与工作面长度呈线性正比关系、与煤层倾角呈非线性正比关系,分析了底板破断结构两种旋转方式和挤压抬高咬合结构的平衡方程及稳定条件,提出了通过缩短工作面长度、伪斜布置方式降低工作面视倾角来提高底板的稳定性。最后,以逢春煤矿N2821急倾斜工作面实际赋存和开采参数为例,确定其最大的破坏深度在1.5 m左右,工作面开采过程中底板不会发生破断。With the increase of coal seam angle,instability will occur in the floor of steep coal seam working face.In view of this situation,based on the analysis of upper and lower stress characteristic of floor in steep coal seam,a mechanical model with constraint condition of floor bottom as clamped and upper end as simple support was built.Combining different segmented infinitesimal body stress of floor,the two-dimensional fourth-order differential equation of stress deformation of the floor beam-column model was studied.Based on the energy principle of Rayleigh ritz method,floor beam-column deflection equation was resolved.The formula of failure criterion of maximum tension slab maximum fracture depth was obtained:The length of working face is in a nonlinear inverse ratio relation with coal seam angle;floor damage depth is linearly proportionate to length of mining face,and nonlinearly proportionate to dip angle of coal seam.Two kinds of rotation and extrusion raise equilibrium equations and stability condition of interlocking structure was analyzed.The solution of improving floor stability by shortening working face length and lowering face visual angle through pseudo inclined arrangement was proposed.Finally,with the actual occurrence and mining parameters of steeply inclined working face N2821 in Fengchun coal mine as an example,the maximum damage depth was determined to be about 1.5 m,and the floor was found not to break during the working face mining.

关 键 词：急倾斜煤层 底板 梁柱理论 稳定控制 

分 类 号：TD353[矿业工程—矿井建设]