本文主要研究内容
作者李泽（2019）在《层间距对“上垮-下柱”复合残采区中层弃煤矿压显现的影响研究》一文中研究指出：随着社会经济的快速发展,我国对煤炭的需求量也在日益增加,而煤炭作为不可再生资源,其保有量日趋减少,为了保障国民经济的持续发展,急需对复杂条件下的遗煤资源进行开采,其中复合残采区中层弃煤在我国许多矿区广泛赋存,中层弃煤采场岩层运动受到多种因素的影响,其中层间距是影响中层弃煤顶底板破坏情况的主要因素。由于煤层间距的不同,会导致中层弃煤采场围岩矿压显现的差异,进而影响中层弃煤的安全开采,只有掌握不同层间岩层厚度条件下的中层弃煤采场矿压显现规律,才能对类似条件下的开采起到广泛的指导作用,为矿压灾害的防治提供参考。在前人研究的基础上,选取大同煤矿集团晋华宫煤矿“上垮-下柱”复合残采区中层弃煤为研究对象,运用现场调研、理论分析、数值模拟等手段,研究不同层间岩层厚度条件下中层弃煤采场岩层的应力分布、移动变形和覆岩结构形式的变化规律,分析了层间距与顶底板岩层破坏情况的关系,从层间距的角度出发,进一步探讨了中层弃煤可采性的评价方法,进而完善复合残采区中层弃煤安全开采的理论基础。主要研究内容及成果如下:(1)中层弃煤采场围岩应力分布的层间距效应主要表现在:随着下位层间距的增大,卸压区范围随之减小、应力集中区范围随之增大,下位层间距为30m时应力集中系数最小并且卸压效果好;上位层间距主要对煤柱上方位置的应力分布影响显著,上位层间距为12m时应力集中系数最小。(2)中层弃煤采场围岩移动变形的层间距效应主要表现在柱采区域上方的位置,而对遗留煤柱上方岩层影响不大:中层弃煤最大下沉量的变化速率随下位层间距的增加而逐渐增大,下煤层采动对中层弃煤的影响程度逐渐减弱;中层弃煤的最大位移量随上位层间距的增加而减小,但是下沉量的变化速率不同,当上位层间距大于9m时,变化速率显著增加。(3)中层弃煤采场围岩结构的层间距效应表现在:下位层间距主要影响中层弃煤底板的结构形式,当下位层间距大于30m时,下控制层受到上下煤层及中层弃煤多重采动影响,仍然能够控制上覆岩层的运移,稳定性良好。在下位层间岩层和遗留煤柱稳定的情况下,随着中层弃煤的开采,不同上位层间距对顶板的垮落特征具有一定的影响,在上位层间距大于12m时,上位层间岩层不发生破断,形成“岩一矸”类拱结构;在上位层间距小于12m时,上位层间岩层出现垮落、破断现象,通过简化模型,分析支架控顶距与直接顶抗拉强度的关系,得到上位层间岩层的最小厚度hx为hx≥(?)。(4)根据下位层间距与坚硬岩层破断距的关系,得到中层弃煤底板存在下控制层结构的临界下位层间距h0,即h0=h·(lmax/Lmax)2;根据上位层间岩层厚度与破坏深度的关系,得到中层弃煤顶板存在上承载层结构的临界上位层间距[h0],即[h0]=[h0]= X·cosφ/2cos(π/4+φ/2)e(π/4+φ/2）tanφ。(5)从层间距的角度出发,将复合残采区中层弃煤顶底板的结构形式归纳为三种类型:下控制层不稳定、下控制层稳定但上承载层不稳定、下控制层上承载层均稳定。进一步形成了“上垮-下柱”复合残采区中层弃煤可采性评价的方法。
Abstract
sui zhao she hui jing ji de kuai su fa zhan ,wo guo dui mei tan de xu qiu liang ye zai ri yi zeng jia ,er mei tan zuo wei bu ke zai sheng zi yuan ,ji bao you liang ri qu jian shao ,wei le bao zhang guo min jing ji de chi xu fa zhan ,ji xu dui fu za tiao jian xia de wei mei zi yuan jin hang kai cai ,ji zhong fu ge can cai ou zhong ceng qi mei zai wo guo hu duo kuang ou an fan fu cun ,zhong ceng qi mei cai chang yan ceng yun dong shou dao duo chong yin su de ying xiang ,ji zhong ceng jian ju shi ying xiang zhong ceng qi mei ding de ban po huai qing kuang de zhu yao yin su 。you yu mei ceng jian ju de bu tong ,hui dao zhi zhong ceng qi mei cai chang wei yan kuang ya xian xian de cha yi ,jin er ying xiang zhong ceng qi mei de an quan kai cai ,zhi you zhang wo bu tong ceng jian yan ceng hou du tiao jian xia de zhong ceng qi mei cai chang kuang ya xian xian gui lv ,cai neng dui lei shi tiao jian xia de kai cai qi dao an fan de zhi dao zuo yong ,wei kuang ya zai hai de fang zhi di gong can kao 。zai qian ren yan jiu de ji chu shang ,shua qu da tong mei kuang ji tuan jin hua gong mei kuang “shang kua -xia zhu ”fu ge can cai ou zhong ceng qi mei wei yan jiu dui xiang ,yun yong xian chang diao yan 、li lun fen xi 、shu zhi mo ni deng shou duan ,yan jiu bu tong ceng jian yan ceng hou du tiao jian xia zhong ceng qi mei cai chang yan ceng de ying li fen bu 、yi dong bian xing he fu yan jie gou xing shi de bian hua gui lv ,fen xi le ceng jian ju yu ding de ban yan ceng po huai qing kuang de guan ji ,cong ceng jian ju de jiao du chu fa ,jin yi bu tan tao le zhong ceng qi mei ke cai xing de ping jia fang fa ,jin er wan shan fu ge can cai ou zhong ceng qi mei an quan kai cai de li lun ji chu 。zhu yao yan jiu nei rong ji cheng guo ru xia :(1)zhong ceng qi mei cai chang wei yan ying li fen bu de ceng jian ju xiao ying zhu yao biao xian zai :sui zhao xia wei ceng jian ju de zeng da ,xie ya ou fan wei sui zhi jian xiao 、ying li ji zhong ou fan wei sui zhi zeng da ,xia wei ceng jian ju wei 30mshi ying li ji zhong ji shu zui xiao bing ju xie ya xiao guo hao ;shang wei ceng jian ju zhu yao dui mei zhu shang fang wei zhi de ying li fen bu ying xiang xian zhe ,shang wei ceng jian ju wei 12mshi ying li ji zhong ji shu zui xiao 。(2)zhong ceng qi mei cai chang wei yan yi dong bian xing de ceng jian ju xiao ying zhu yao biao xian zai zhu cai ou yu shang fang de wei zhi ,er dui wei liu mei zhu shang fang yan ceng ying xiang bu da :zhong ceng qi mei zui da xia chen liang de bian hua su lv sui xia wei ceng jian ju de zeng jia er zhu jian zeng da ,xia mei ceng cai dong dui zhong ceng qi mei de ying xiang cheng du zhu jian jian ruo ;zhong ceng qi mei de zui da wei yi liang sui shang wei ceng jian ju de zeng jia er jian xiao ,dan shi xia chen liang de bian hua su lv bu tong ,dang shang wei ceng jian ju da yu 9mshi ,bian hua su lv xian zhe zeng jia 。(3)zhong ceng qi mei cai chang wei yan jie gou de ceng jian ju xiao ying biao xian zai :xia wei ceng jian ju zhu yao ying xiang zhong ceng qi mei de ban de jie gou xing shi ,dang xia wei ceng jian ju da yu 30mshi ,xia kong zhi ceng shou dao shang xia mei ceng ji zhong ceng qi mei duo chong cai dong ying xiang ,reng ran neng gou kong zhi shang fu yan ceng de yun yi ,wen ding xing liang hao 。zai xia wei ceng jian yan ceng he wei liu mei zhu wen ding de qing kuang xia ,sui zhao zhong ceng qi mei de kai cai ,bu tong shang wei ceng jian ju dui ding ban de kua la te zheng ju you yi ding de ying xiang ,zai shang wei ceng jian ju da yu 12mshi ,shang wei ceng jian yan ceng bu fa sheng po duan ,xing cheng “yan yi gan ”lei gong jie gou ;zai shang wei ceng jian ju xiao yu 12mshi ,shang wei ceng jian yan ceng chu xian kua la 、po duan xian xiang ,tong guo jian hua mo xing ,fen xi zhi jia kong ding ju yu zhi jie ding kang la jiang du de guan ji ,de dao shang wei ceng jian yan ceng de zui xiao hou du hxwei hx≥(?)。(4)gen ju xia wei ceng jian ju yu jian ying yan ceng po duan ju de guan ji ,de dao zhong ceng qi mei de ban cun zai xia kong zhi ceng jie gou de lin jie xia wei ceng jian ju h0,ji h0=h·(lmax/Lmax)2;gen ju shang wei ceng jian yan ceng hou du yu po huai shen du de guan ji ,de dao zhong ceng qi mei ding ban cun zai shang cheng zai ceng jie gou de lin jie shang wei ceng jian ju [h0],ji [h0]=[h0]= X·cosφ/2cos(π/4+φ/2)e(π/4+φ/2）tanφ。(5)cong ceng jian ju de jiao du chu fa ,jiang fu ge can cai ou zhong ceng qi mei ding de ban de jie gou xing shi gui na wei san chong lei xing :xia kong zhi ceng bu wen ding 、xia kong zhi ceng wen ding dan shang cheng zai ceng bu wen ding 、xia kong zhi ceng shang cheng zai ceng jun wen ding 。jin yi bu xing cheng le “shang kua -xia zhu ”fu ge can cai ou zhong ceng qi mei ke cai xing ping jia de fang fa 。
论文参考文献
论文详细介绍
论文作者分别是来自太原理工大学的李泽，发表于刊物太原理工大学2019-07-26论文，是一篇关于复合残采区论文,层间距论文,应力分布论文,移动变形论文,覆岩结构论文,可采性论文,太原理工大学2019-07-26论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自太原理工大学2019-07-26论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：复合残采区论文; 层间距论文; 应力分布论文; 移动变形论文; 覆岩结构论文; 可采性论文; 太原理工大学2019-07-26论文;