孤岛工作面内错尾巷加强支护技术研究
发布时间:2018-03-09 20:19
本文选题:孤岛工作面 切入点:内错尾巷 出处:《太原理工大学》2015年硕士论文 论文类型:学位论文
【摘要】:由于跳采的采煤方式不仅能有效解决采掘接替紧张的矛盾,还能降低工作面巷道应力集中,,因此,受到很多煤炭企业的青睐,但是这种采煤方式无法避免地形成孤岛工作面。这种工作面与普通工作面相比,除了受到采动引起的超前支承压力的影响以外,而且还受到相邻采空区侧向支承压力的影响,这就导致应力集中程度很高,围岩变形很难控制,给回采巷道的维护带来严峻挑战。 虽然我国许多煤矿企业都有对孤岛工作面成功回采的先例和经验,也取得了很多宝贵的现场实测数据和研究成果,但大多数都是通过加强锚固支护、注浆加固等方式来提高工作面巷道的围岩自身承载力,达到控制围岩变形的目的。虽然内错尾巷和进风巷、回风巷一样同属于回采巷道,但是巷道用途不同决定了加强锚固支护、注浆加固等方法都不适用于对内错尾巷围岩的控制,巷道破损严重的问题一直没有得到有效解决。 本文以阳煤二矿80704工作面内错尾巷为工程背景,对15#煤层赋存条件、采煤工艺、现有支护方式进行系统调研,理论分析了孤岛工作面上覆岩层结构特征、巷道变形破坏形式、影响因素,掌握了围岩控制原理,结合现场实际情况首次提出了采用分节组装式高强度钢筋混凝土支柱对内错尾巷进行加强支护的围岩控制技术;利用有限元软件ANSYS建立不同承载面积的混凝土支柱模型,加载后观察其受力破坏情况,确定了混凝土支柱主承载面直径为0.3m;根据巷道围岩受力情况,采用FLAC3D软件建立80704工作面的数值模拟模型,分别对内错尾巷采用原有锚固支护方案和加强支护方案两种情况进行模拟,对比分析结果表明:采用混凝土支柱加强支护后,巷道塑性区分布范围大幅缩小,顶底板相对位移量减少了65%,两帮收缩量减少了60%,巷道变形量控制在合理范围内,能够保证通风有效断面;最终确定了80704内错尾巷支柱布置方案,并定期进行矿压观测,根据观测数据、巷道变形破坏现象、混凝土支柱受力变形情况、有效通风断面等方面分析内错尾巷加强支护的效果。 现场实测结果表明,观测期间混凝土支柱支护段巷道表面位移较小,未出现明显底鼓现象,支柱底端未插入底板,只有少数支柱接顶部分出现外皮脱落现象,但不影响对巷道围岩稳定性控制,内错尾巷断面积普遍保持在7.2m2以上,断面收缩率仅为18%,可见分节组装式混凝土支柱对巷道围岩稳定性控制效果显著,验证了“采用分节组装式混凝土支柱将顶板压力传递到底板中央控制底鼓,同时减轻两帮受力,进而控制两帮相对移近量”支护方案的正确性。 本文的研究成果在阳泉矿区具有广泛的推广前景,同时为面临同类巷道支护难题的其他矿区提供参考。
[Abstract]:Because the mining method of jumping mining can not only effectively solve the tension contradiction of mining replacement, but also reduce the stress concentration in the face roadway, so it is favored by many coal enterprises. However, this mining method can not avoid the formation of isolated island face. Compared with ordinary working face, this kind of face is not only affected by the leading support pressure caused by mining movement, but also affected by the lateral supporting pressure of adjacent goaf. As a result, the stress concentration is very high and the deformation of surrounding rock is difficult to control, which brings serious challenge to the maintenance of mining roadway. Although many coal mining enterprises in our country have the precedent and experience of successful mining of isolated island face, and have also obtained a lot of valuable field measured data and research results, most of them are through strengthening anchor support. Grouting reinforcement is used to improve the bearing capacity of surrounding rock and to control the deformation of surrounding rock. However, the different uses of roadway determine the strengthening of bolting support, grouting reinforcement and other methods are not suitable for the control of the surrounding rock of the roadway. The serious problem of roadway breakage has not been effectively solved. Based on the engineering background of staggered roadway in No. 80704 working face of No. 2 Coal Mine in Yangyang Coal Mine, this paper makes a systematic investigation on the occurrence conditions of No. 15 coal seam, coal mining technology and existing supporting methods, and theoretically analyzes the structural characteristics of overlying strata and the deformation and failure form of roadway in Gudao face. Influence factors, master the principle of surrounding rock control, combined with the actual situation of the site for the first time proposed the use of segmented assembly of high strength reinforced concrete pillar to strengthen the support of the surrounding rock roadway wall rock control technology; The finite element software ANSYS is used to establish concrete strut model with different bearing area. After loading, the main bearing surface diameter of concrete pillar is determined to be 0.3m.According to the stress situation of roadway surrounding rock, the concrete bearing surface diameter is determined to be 0.3 m. The numerical simulation model of 80704 working face was established by FLAC3D software. The original bolting support scheme and the strengthening support scheme were simulated respectively. The comparison and analysis results show that: the concrete prop is used to strengthen the support, The distribution range of plastic zone of roadway has been reduced greatly, the relative displacement of roof and floor has been reduced by 65 percent, the amount of contraction of two sides has been reduced by 60, the amount of deformation of roadway has been controlled within a reasonable range, which can ensure the effective ventilation section, and the layout scheme of pillar of 80704 cross tail roadway has been determined finally. According to observation data, deformation and failure phenomenon of roadway, stress deformation of concrete prop, effective ventilation section and so on, the effect of strengthening support in inner staggered tail roadway is analyzed. The field measured results show that during the observation period, the surface displacement of the roadway in the concrete pillar support section is relatively small, there is no obvious bottom bulging phenomenon, the bottom end of the pillar is not inserted into the bottom slab, and only a few of the pillars are connected to the roof. But it has no influence on the stability control of roadway surrounding rock, the area of inner staggered tail roadway is generally above 7.2 m2, the shrinkage rate of section is only 188.It can be seen that the effect of segmented assembled concrete pillar on the stability control of roadway surrounding rock is remarkable. The correctness of the supporting scheme of "adopting segmented and assembled concrete pillars to transfer the roof pressure to the bottom plate to control the central floor drum, and at the same time reducing the force on the two sides and then controlling the relative movement of the two sides" is verified. The research results in this paper have a broad prospect in Yangquan mining area, and provide reference for other mining areas facing similar roadway support problems.
【学位授予单位】:太原理工大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TD353
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