摘要
综采工作面大断面切眼围岩的稳定性是影响综采工作面正常设备安装与回采的关键因素,以小保当一号煤矿112203综采工作面大断面切眼为研究对象,通过理论分析研究了112203综采工作面大断面切眼顶板变形机理及理论支护参数。采用离散元数值模拟软件建立了UDEC Trigon模型,研究了支护强度对二次成巷顶板裂隙演化规律、破坏模式和损伤程度的影响规律。数值模拟结果表明:合理的支护技术能够控制顶板微裂纹的扩展降低宏观裂隙的发育高度。长短锚索联合支护后顶板岩层中存在的岩石桥能够有效的限制宏观裂缝的形成以及它们之间的相互作用,特别是对交界面区域的重点支护能够降低二次成巷顶板裂隙的发育高度,减弱深部大断面切眼顶板岩层的损伤程度。现场试验表明,采用加长锚索以及单体液压支柱的补强支护后,112203综采工作面大断面切眼两帮移近量稳定在350 mm左右,顶底板移近量稳定在550 mm左右,顶板未出现明显离层,最大顶板离层量为2.4 mm。本文的理论分析及数值模拟有助于理解综采工作面大断面切眼顶板破坏模式,同时为其控制技术参数的设计提供了方法。
The stability of the surrounding rock of the fully mechanized mining face open cut is a key factor affecting the normal equipment installation and mining of the fully mechanized mining face.Taking the large cross-section open cut of the 112203 fully mechanized mining face in Xiaobaodang No.1 Coal Mine as the research object,theoretical calculation is used to analyze the deformation mechanism of the roof of the 112203 fully mechanized mining face open cut and the theoretical support parameters.The discrete element numerical simulation software is used to establish the UDEC Trigon model,and the influence of support strength on the evolution law of roof crack,failure mode and damage degree in the secondary roadway is studied.The numerical simulation results show that reasonable support technology can control the expansion of roof micro-cracks and reduce the development height of macro-fractures.The rock bridges existing in the roof strata after the combined support of long and short anchor cables can effectively limit the formation of macro-fractures and their interaction,especially the key support in the intersection area can reduce the development height of roof fractures in the secondary roadway and weaken the damage degree of roof strata in the large crosssection open cut.Field tests show that after reinforcement support with extended anchor cables and single hydraulic props,the approaching distance between the two sides of the large cross-section open cut in 112203 fully mechanized mining face is stable at about 350 mm,and the approaching distance between the roof and floor is stable at about 550 mm;there is no obvious delamination on the roof,and the maximum delamination amount on the top plate is 2.4 mm.The method of theoretical analysis and numerical simulation in this paper is helpful to understand the failure mode of the roof of the large crosssection open cut of the fully mechanized mining face and provides a new approach for the design of its control technical parameters.
作者
席义苗
司建锋
常毛毛
乔懿麟
李昊城
XI Yimiao;SI Jianfeng;CHANG Maomao;QIAO Yilin;LI Haocheng(Xiaobaodang Mining Co.,Ltd.,of Shaanxi,Yulin 719000,China;Qichen Technology Co.,Ltd.,Weinan Shaanxi Coal,Weinan 714000,China)
出处
《中国矿业》
北大核心
2024年第S02期239-244,共6页
China Mining Magazine
基金
国家自然科学基金项目“采动大变形巷道锚索失效模式与形成机理研究”资助(编号:52074117)。
关键词
大断面切眼
顶板变形
Trigon模型
联合支护
围岩控制
large section cut
roof deformation
Trigon model
combined supporting
surrounding rock control
